JS libraries

PnPm is nice package manager. redaxios is great for web fetches.

Modern Errors is nice for error handling.

patch-package is great for patching broken libraries.

Web Dev frameworks

Solid - Declarative, efficient, and flexible JavaScript library for building user interfaces. (Code) (Website Code) (Awesome) (HN)
San - Flexible JavaScript component framework.
hapi - Rich framework for building applications and services.
Koa - Smaller, more expressive, and more robust foundation for web applications and APIs. (Code) (koa-ts)
Umi - Pluggable enterprise-level react application framework.
Vue.js - Progressive JavaScript Framework.
Mithril - Modern client-side JavaScript framework for building Single Page Applications. (HN)
Neutrino dev
Alpine.js - Rugged, minimal framework for composing JavaScript behavior in your markup. (Awesome Alpine) (HN) (Web) (Docs) (HN)
After.js - Next.js-like framework for server-rendered React apps built with React Router 4.
Torus - Event-driven model-view UI framework for the web, focused on being tiny, efficient, and free of dependencies. (Web)
Hyperapp - Tiny framework for building web interfaces. (Web) (HN) (Hyperawesome)
Hyperapp FX - Effects for use with Hyperapp.
Phenomic - Modular website compiler (React, Webpack, Reason and whatever you want).
Halfmoon - Front-end framework with a built-in dark mode and full customizability using CSS variables; great for building dashboards and tools. (Docs)
Sinuous - Low-level UI library with a tiny footprint. (Docs)
Overture - Powerful JS library for building really slick web applications, with performance at, or surpassing, native apps.
Lucia - Tiny library for tiny web apps. (Docs)
Ractive.js - Next-generation DOM manipulation.
JSX Lite - Write components once, run everywhere. Compiles to Vue, React, Solid, Liquid, more.
Perlite - Hyperactiv + lit-html + extensions. Simple and declarative way to create rich client-side widgets designed with server-side apps in mind.
Democrat - Library that mimic the API of React (Components, hooks, Context...) but instead of producing DOM mutation it produces a state tree.
Raj - Elm Architecture for JavaScript.
Reframe - New kind of web framework.
observablehq/stdlib - Observable standard library.
Choo - Sturdy 4kb frontend framework. (Web)
Typera - Type-safe routes for Express and Koa.
Frourio - Fast and type-safe full stack framework, for TypeScript. (Web)
Svelto - Modular front end framework for modern browsers, with battery included: 100+ widgets and tools.
modular - Collection of tools and guidance to enable UI development at scale. (Tweet)
Turbo - Speed of a single-page web application without having to write any JavaScript. (Web)
Fre - Tiny Coroutine framework with Fiber.
Glimmer - Fast and light-weight UI components for the web. (Code)
Glimmer VM - Flexible, low-level rendering pipeline for building a "live" DOM from Handlebars templates that can subsequently be updated cheaply when data changes.
frint - Modular JavaScript framework for building scalable and reactive applications.
Next.js - Framework for server-rendered or statically-exported React apps.
Nano Router - Framework agnostic minimalistic router with a focus on named routes.
tiny-request-router - Fast, generic and type safe router (match request method and path).
Synergy - Tiny runtime library for building web user interfaces. (HN)
dflex - JavaScript Project to Manipulate DOM Elements.
morphdom - Fast and lightweight DOM diffing/patching (no virtual DOM needed).
Forgo - Ultra-light UI runtime. Makes it super easy to create modern web apps using JSX (like React).
Whats Up - Front-end framework based on ideas of streams and fractals.
Boost - Collection of type-safe cross-platform packages for building robust server-side and client-side systems.
Nostalgie - Opinionated, full-stack, runtime-agnostic framework for building web apps and web pages using react. (Web)
Lumino - Library for building interactive web applications.
Skruv - No-dependency, no-build, small JS framework. (Code) (HN)
jQuery - Fast, small, and feature-rich JavaScript library. (Web)
neo.mjs - Create blazing fast multithreaded Web Apps.
presta - Hyper minimal framework for the modern web. (Web)
Haptic - Reactive web rendering in TSX with no virtual DOM, no compilers, and no magic.
Astro - Build faster websites with less client-side JavaScript. (Web) (HN) (Look at Building with Astro) (Play) (Tweet)
Logux Client - New way to connect client and server. Instead of sending HTTP requests, it synchronizes log of operations between client, server, and other clients. (Examples)
CalDOM - Agnostic, reactive & minimalist (3kb) JavaScript UI library with direct access to native DOM. (Web)
Trimmings - Zero-configuration JavaScript library that adds a layer of smooth and fast in-page interaction to your web pages.
Piral - Easily build a next generation portal application using microfrontends. (Code)
Qiankun - Implementation of Micro Frontends, which based on single-spa. It aims to make it easier and painless to build a production-ready microfront-end architecture system. (Web)
Drayman - Server-side component framework.
yeet - Teeny-weeny front end framework.
Xeact - Revolutionary Femtoframework For High Efficiency JavaScript Development. (Article)
$mol - Fastest reactive micro-modular compact flexible lazy ui web framework.
Reflex - Functional reactive UI library.
Gestalt - Modern opinionated and batteries-included NodeJS framework for building web sites and apps.
Logux Core - New way to connect client and server. Instead of sending HTTP requests (e.g., AJAX and GraphQL) it synchronizes log of operations between client, server, and other clients.
set-dom - Lightweight DOM diffing with plain old HTML.
Ralix - Micro framework for building and organizing your front-end.
rawth - Pure functional isomorphic router based on streams.
Corset - Declarative data bindings, bring your own backend. (Web) (Video)
hdot - Zero-dependency, buildless, terse, and type-safe way to write HTML in JavaScript.
SurveyJS - JavaScript Survey and Form Library. (Web)
Helmet - Help secure Express apps with various HTTP headers.
Reactif - Fast 5kB reactive & elegant functional library for rapidly building modern UIs on the web.
Swup - Complete, flexible, extensible and easy to use page transition library for your static web.
Taxi - Library for adding AJAX navigation and beautiful transitions to your website.
Tornis - Helps you watch and respond to changes in your browser's viewport.
Tonic - Low Profile Component Framework – Stable, minimal, easy to audit, zero-dependencies and build-tool-free. (Web)
Gluon - Framework for creating desktop apps from websites, using system installed browsers and NodeJS.
nanomorph - Hyper fast diffing algorithm for real DOM nodes.
Marko Run - Marko application framework.

Animation

Anime.js - JavaScript animation engine.
popmotion - Functional, reactive animation library.
impress.js - Presentation framework based on the power of CSS3 transforms and transitions.
Pts - Library for visualization and creative-coding. (Web)
lax.js - Simple & lightweight (<4kb gzipped) vanilla JavaScript library to create smooth & beautiful animations when you scroll.
Flipping - Library (and collection of adapters) for implementing FLIP transitions.
Ola - Smooth animation library for interpolating numbers.
react-spring - Spring physics based React animation library.
FAT - Web's fastest and most lightweight animation tool.
React Easy Flip - Lightweight React library for smooth FLIP animations.
AOS - Animate on scroll library.
flubber - Tools for smoother shape animations.
tatween - JavaScript library providing a block-based animation API.

CLI

mri - Quickly scan for CLI flags and arguments.
qoa - Minimal interactive command-line prompts.
sade - Smooth (CLI) Operator.
yargs-parser - Mighty option parser used by yargs.
boxen-cli - Create boxes in the terminal.
command-line-args - Mature, feature-complete library to parse command-line options.
Prompts - Lightweight, beautiful and user-friendly interactive prompts.
minimist - Parse argument options.
commist - Build command line application with multiple commands the easy way. To be used with minimist.
help-me - Help command for node, to use with minimist and commist.
Inquirer.js - Collection of common interactive command line user interfaces.
Handle-CLI-Error - Error handler for CLI applications.
meow - CLI app helper.
termynal - Lightweight and modern terminal animations using async/await.
log-symbols - Colored symbols for various log levels.
ora - Elegant terminal spinner.
Concolor - Coloring template strings using tags with annotations.
Lesy js - Node JS based CLI framework to build modern Command line applications.

ML

mind - Neural network library built in JavaScript.

Test

Unexpected - Extensible BDD assertion toolkit. (Docs)
Fishery - Library for setting up JavaScript objects as test data.
pentf - Parallel end-to-end test framework.
test-flat - Test framework extension to support resources teardown and cleanup in flat tests.
zora - Lightest, yet Fastest JavaScript test runner for nodejs and browsers.
Vest - Declarative Validation Testing.
uvu - Extremely fast and lightweight test runner for Node.js and the browser.
Spearmint - Testing, simplified. An inclusive, accessibility-first GUI for generating clean, semantic JavaScript tests in only a few clicks of (or keystrokes) of a button. (Web)
StrykerJS - Mutation testing for JavaScript and friends. (Web)
xv - Simple, fast and small test runner.
Peeky - Test framework for the curious minds. (Web)
gremlins.js - Monkey testing library for web apps and Node.js.
JSVerify - Property-based checking. Like QuickCheck.
brittle - TAP test runner built for modern times.
fake-timers - Fake setTimeout and friends (collectively known as "timers"). Useful in your JavaScript tests.
esmock - Provides native ESM import mocking for unit tests.
rewire - Easy monkey-patching for node.js unit tests.

Graphics

Lumen 2D - 2D javascript renderer using web workers.
Blurry - Simulating depth of field with particles on a shader.
Window.js - Open-source JavaScript runtime for desktop graphics programming. (HN)
glsl-tone-map - Collection of tone mapping functions available both as ES modules strings and as GLSL files for use with glslify.

State management

Effector - Reactive state manager.
Mutik - Tiny (495B) immutable state management library based on Immer.
Overmind - Frictionless state management. (Docs) (HN)
Storeon - Tiny event-based Redux-like state manager for React and Preact.
Overstated - React state management library that's delightful to use, without sacrificing performance or scalability.
Akita - State Management Tailored-Made for JS Applications.
Observable Store - Provides a simple way to manage state in Angular, React, Vue.js and other front-end applications.
Cerebral - Declarative state and side effects management solution for popular JavaScript frameworks.
Hooksy - State management solution based on react hooks.
React Easy State - Simple React state management. Made with ❤️ and ES6 Proxies.
wana - Easy observable state for React.
Recoil - Experimental set of utilities for state management with React. (Web) (Video) (Reddit) (Rewriting from scratch) (Recoilize - Recoil developer tool)
State Designer - JavaScript and TypeScript library for managing the state of a user interface.
Fluxible - Pluggable container for universal flux applications.
Logux State - Tiny state manager with CRDT, cross-tab, and Logux support.
Statery - Surprise-Free State Management. Designed for React with functional components.

API bindings

NodeJS Instagram private API client

DB

sql.js - SQLite compiled to JavaScript. Allows you to create a relational database and query it entirely in the browser. (Docs) (HN)
SQigiL - Postgres SQL template string for Javascript.
Postgrest JS - Isomorphic JavaScript client for PostgREST.
Connect PG Simple - Simple, minimal PostgreSQL session store for Express/Connect.
SyncedDB - Makes it easy to write offline-first applications with realtime syncing and server side persistence.
Dexie.js - Minimalistic IndexedDB Wrapper. (Docs)
Keyv - Simple key-value storage with support for multiple backends.
Dexie.js - Minimalistic Wrapper for IndexedDB. (Web)
lowdb - Simple to use local JSON database.
PicoDB - Tiny in-memory database (MongoDB like) that stores JSON documents.
level-web-stream - Read from an abstract-level database using Web Streams.
iron-store - In-memory, signed and encrypted JavaScript store.
Keyv - Simple key-value storage with support for multiple backends.
Quickgres - Native-JS PostgreSQL client library.
invert-kv - Invert the key/value of an object.
HashQL - Access DB from UI.
heapify - Fastest JavaScript priority queue out there. Zero dependencies.
Databricks SQL Driver for NodeJS
doubledb - On disk database that indexes everything for fast querying.
pg-promise - PostgreSQL interface for Node.
KV.js - Fast, in-memory data store written in pure JavaScript, heavily inspired by Redis and Memcached.

React

state-machines-in-react - Small React, xstate and Framer Motion demo.

Math

Eigen.js - Port of the Eigen C++ linear algebra library.
victor - JavaScript 2D vector class with methods for common vector operations.

Crypto

Elliptic - Fast Elliptic Curve Cryptography in plain JS.
TweetNaCl.js - Port of TweetNaCl cryptographic library to JavaScript.
Tiny WebCrypto - Tiny isomorphic WebCrypto object, it just gives you the native one the current platform provides.
hypercore-crypto - Crypto primitives used in hypercore, extracted into a separate module.
SHA-3 for JavaScript
sodium-native - Low level bindings for libsodium.

Other

micro github - Tiny microservice that makes adding authentication with GitHub to your application easy.
pico.js - Face detection library in 200 lines of JavaScript.
mdxc - Use React Components within Markdown.
ReLaXeD - Create PDF documents using web technologies. (Examples)
Dragula - Drag and drop so simple it hurts.
Hammer.js - Multi-touch gestures.
emittery - Simple and modern async event emitter.
Xstate - State machines and statecharts for the modern web. (State Machines Workshop) (Tweet)
XState Helpers - Collection of helpers for XState with React.
xstate-component-tree - Build a tree of UI components based on your state chart.
virtual-scroller - Maps a provided set of JavaScript objects onto DOM nodes, and renders only the DOM nodes that are currently visible, leaving the rest "virtualized".
jSPDF - Client-side JavaScript PDF generation for everyone.
ForgJS - JavaScript lightweight object validator.
faker.js - Generate massive amounts of realistic fake data in Node.js and the browser.
arg - Simple argument parsing.
fbt - JavaScript Internationalization Framework.
fuzzysearch - Tiny and blazing-fast fuzzy search in JavaScript.
normalizr - Normalizes nested JSON according to a schema.
FBJS - Collection of utility libraries used by other Facebook JS projects.
Uppy - Next open source file uploader for web browsers. (Web)
ScrollReveal - Animate elements as they scroll into view.
Shiny - Add shiny reflections to text, backgrounds, and borders on devices that support the DeviceMotion event.
Hotkey Behavior - Trigger a action on element when keyboard hotkey is pressed.
Bili - Makes it easier to bundle JavaScript libraries.
Memoizee - Complete memoize/cache solution for JavaScript.
Immer - Create the next immutable state by mutating the current one.
FlexSearch - Web's fastest and most memory-flexible full-text search library with zero dependencies.
cofx - Node and javascript library that helps developers describe side-effects as data in a declarative, flexible API.
Mercury Parser - Extracts the bits that humans care about from any URL you give it.
Refract - Harness the power of reactive programming to supercharge your components.
MemJS - Memcache client for node using the binary protocol and SASL authentication.
memfs - In-memory filesystem with Node's API.
Accounts - Fullstack authentication and accounts-management for GraphQL and REST.
Cleave.js - Format input text content when you are typing...
Unistore - Tiny 350b centralized state container with component bindings for Preact & React.
Ramda - Practical functional library for JavaScript programmers. (Docs) (HN)
fromfrom - JS library written in TS to transform sequences of data from format to another.
Editor.js - Block-styled editor with clean JSON output.
ijk - Transforms arrays into virtual DOM trees.
Cleave.js - Format input text content when you are typing.
Oboe.js - Streaming approach to JSON. Oboe.js speeds up web applications by providing parsed objects before the response completes.
Choices.js - Vanilla JS customisable select box/text input plugin.
Shepherd - Guide your users through a tour of your app.
object-cull - Create a copy of an object with just the bits you actually need.
Sigma - JavaScript library dedicated to graph drawing.
interact.js - JavaScript drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers.
flru - Tiny (215B) and fast Least Recently Used (LRU) cache.
Yup - Dead simple Object schema validation.
Lerna - Tool for managing JavaScript projects with multiple packages.
WikiJs - Wikipedia Interface for Node.js.
virtual-audio-graph - Library for declaratively manipulating the Web Audio API.
deep-object-diff - Deep diffs two objects, including nested structures of arrays and objects, and returns the difference.
Snarkdown - Snarky 1kb Markdown parser written in JavaScript.
Terser - JavaScript parser, mangler, optimizer and beautifier toolkit for ES6+.
AppAuthJS - JavaScript client SDK for communicating with OAuth 2.0 and OpenID Connect providers.
expr-eval - Mathematical expression evaluator in JavaScript.
robust-predicates - Fast robust predicates for computational geometry in JavaScript.
Sanctuary - JavaScript functional programming library inspired by Haskell and PureScript.
modali - Delightful modal dialog component for React, built from the ground up to support React Hooks.
Tweakpane - Compact GUI for fine-tuning parameters and monitoring value changes.
crocks - Collection of well known Algebraic Data Types for your utter enjoyment.
Just - Library of zero-dependency npm modules that do just do one thing.
nanoid - Tiny (139 bytes), secure, URL-friendly, unique string ID generator for JavaScript.
debug - Tiny JavaScript debugging utility modelled after Node.js core's debugging technique. Works in Node.js and web browsers.
roughViz.js - Reusable JavaScript library for creating sketchy/hand-drawn styled charts in the browser.
Mitt - Tiny 200 byte functional event emitter / pubsub.
RequireJS - File and module loader for JavaScript.
Zero - 3D graphics rendering pipeline. Implemented in JavaScript. Run in a terminal.
xstate-viz - Visualize state charts.
htmr - Simple and lightweight (< 2kB) HTML string to React element conversion library.
react-jsx-parser - React component which can parse JSX and output rendered React Components.
Static Land - Specification for common algebraic structures in JavaScript based on Fantasy Land.
sorted-queue - Sorted queue, based on an array-backed binary heap.
polendina - Non-UI browser testing for JavaScript libraries from the command-line.
agadoo - Check whether a package is tree-shakeable.
Fielder - React form library which adapts to change.
lemonad - Functional programming library for JavaScript. An experiment in elegant JS.
Mockttp - Lets you quickly & reliably test HTTP requests & responses in JavaScript, in both Node and browsers.
Flowy - Minimal javascript library to create flowcharts.
d3-dag - Layout algorithms for visualizing directed acyclic graphs.
renature - Physics-based animation library for React focused on modeling natural world forces.
Morphism - Do not repeat anymore your objects transformations.
Tonic - Stable, Minimal, Auditable, Build-Tool-Free, Low Profile Component Framework.
Quiet.js - Transmit data with sound using Web Audio -- Javascript binding for libquiet.
Bindery - Library for designing printable books with HTML and CSS.
Wretch - Tiny wrapper built around fetch with an intuitive syntax.
Virt.js - Free collection of useful standard devices, that can be used to power various engine that makes use of the exposed interfaces.
Path-to-RegExp - Turn a path string such as /user/:name into a regular expression.
Bacon.js - Functional reactive programming library for TypeScript and JavaScript.
GGEditor - Visual graph editor based on G6 and React.
Arbor - Graph visualization library using web workers and jQuery. (Web)
fsm-as-promised - Finite state machine library using ES6 promises.
x-spreadsheet - Web-based JavaScript（canvas）spreadsheet.
IsoCity - Isometric city builder in JavaScript.
car - Simple 2d car physics with JavaScript. (HN)
Picomatch - Blazing fast and accurate glob matcher written in JavaScript.
react-isomorphic-data - Easily fetch data in your React components, with similar APIs to react-apollo.
klona - Tiny (228B) and fast utility to "deep clone" Objects, Arrays, Dates, RegExps, and more.
ScrollMagic - JavaScript library for magical scroll interactions.
GoJS - JavaScript and TypeScript library for building interactive diagrams and graphs.
Rete - JavaScript framework for visual programming and creating node editor. (HN)
Pre3d - JavaScript 3d rendering engine.
dancer.js - High-level audio API, designed to make sweet visualizations.
model-viewer - Easily display interactive 3D models on the web and in AR.
Spars - General toolkit for creating interactive web experiences.
NeuroJS - JavaScript deep learning and reinforcement learning library.
Hareactive - Purely functional reactive programming library.
Mirage JS - Client-side server to develop, test and prototype your JavaScript app.
dfa - State machine compiler with regular expression style syntax.
Jtree - Tree Notation TypeScript/Javascript library.
Hydra - Livecoding networked visuals in the browser.
p-queue - Promise queue with concurrency control.
gsheets - Get public Google Sheets as plain JavaScript/JSON.
alga-ts - Algebraic graphs implementation in TypeScript.
Chart.js - Simple HTML5 Charts using the <canvas> tag. (Awesome)
on-change - Watch an object or array for changes.
clean-set - Deep assignment alternative to the object spread operator and Object.assign.
Search Query Syntax Parser
Uppload - Better JavaScript image uploader with 30+ plugins.
pino - Super fast, all natural JSON logger.
Orbit - Composable data framework for ambitious web applications.
panzoom - Universal pan and zoom library (DOM, SVG, Custom).
intl-tel-input - JavaScript plugin for entering and validating international telephone numbers.
three.js - JavaScript 3D library.
shortid - Short id generator. Url-friendly. Non-predictable. Cluster-compatible.
styx - Derives a control flow graph from a JavaScript AST.
Crossfilter - JavaScript library for exploring large multivariate datasets in the browser.
SiriWave - Apple Siri wave-form replicated in a JS library.
Shades - Lodash-inspired lens-like library for Javascript.
mxGraph - Fully client side JavaScript diagramming library.
cacache - Node.js library for managing local key and content address caches.
enhanced-resolve - Offers an async require.resolve function. It's highly configurable.
notevil - Evalulate javascript like the built-in javascript eval() method but safely.
react-digraph - Library for creating directed graph editors.
bent - Functional JS HTTP client (Node.js & Fetch) w/ async await.
CLUI - Collection of JavaScript libraries for building command-line interfaces with context-aware autocomplete. (Article) (HN)
cosha - Colorful shadows for your images.
Rambda - Faster and smaller alternative to Ramda.
MathJax - Open-source JavaScript display engine for LaTeX, MathML, and AsciiMath notation that works in all modern browsers. (Web) (HN)
Litepicker - Date range picker - lightweight, no dependencies.
core-js - Modular standard library for JavaScript.
timeago.js - Nano library (less than 2 kb) used to format datetime with *** time ago statement. eg: '3 hours ago'.
Serialize JavaScript - Serialize JavaScript to a superset of JSON that includes regular expressions, dates and functions.
Tippy.js - Tooltip, popover, dropdown, and menu library.
howler.js - JavaScript audio library for the modern web.
date-fns - Modern JavaScript date utility library.
Midi - Convert MIDI into Tone.js-friendly JSON.
face-api.js - JavaScript API for face detection and face recognition in the browser and nodejs with tensorflow.js.
Spotlight - Search widget for your web API.
Fuse - Lightweight fuzzy-search, in JavaScript.
Xterm.js - Terminal for the web. (Web) (HN)
Change Case - Convert strings between camelCase, PascalCase, Capital Case, snake_case and more.
ChronoGraph - Reactive, graph-based, computation engine.
Sprotty - Diagramming framework for the web.
prerender.js - Loads pages quickly on any browser.
on-finished - Execute a callback when a request closes, finishes, or errors.
ColorFns - Modern JavaScript color utilities library.
grapheme-splitter - JavaScript library that breaks strings into their individual user-perceived characters.
Web Animations - JavaScript implementation of the Web Animations API.
p-limit - Run multiple promise-returning & async functions with limited concurrency.
Highcharts JS - JavaScript charting library based on SVG.
μPlot - Small, fast chart for time series, lines, areas, ohlc & bars.
Baobab - JavaScript & TypeScript persistent and optionally immutable data tree with cursors.
emoji-regex - Regular expression to match all Emoji-only symbols as per the Unicode Standard.
MerkleTree.js - Construct Merkle Trees and verify proofs in JavaScript.
Snabbdom - Virtual DOM library with focus on simplicity, modularity, powerful features and performance.
Thwack - Tiny modern data fetching solution.
Regenerate - Generate JavaScript-compatible regular expressions based on a given set of Unicode symbols or code points.
Crank.js - Write JSX-driven components with functions, promises and generators. (Article) (Reddit) (HN)
redaxios - Axios API, as an 800 byte Fetch wrapper.
Math.js - Extensive math library for JavaScript and Node.js.
pixelmatch - Smallest, simplest and fastest JavaScript pixel-level image comparison library.
quilt - Loosely related set of packages for JavaScript / TypeScript projects at Shopify.
jsondiffpatch - Diff & patch JavaScript objects.
RVal - Minimalistic transparent reactive programming library.
orbit-controls - Generic controls for orbiting a target in 3D.
estree-walker - Traverse an ESTree-compliant AST.
Jitsi Meet API library - Can use Jitsi Meet API to create Jitsi Meet video conferences with a custom GUI.
isomer - Simple isometric graphics library for HTML5 canvas.
Schema to Yup schema
Mordred - Source data from anywhere, for Next.js, Nuxt.js, Eleventy and many more.
ASScroll - Hybrid smooth scroll setup that combines the performance gains of virtual scroll with the reliability of native scroll.
Gallery - Light, responsive, and performant JavaScript gallery.
Logux Server - Build own Logux server or make proxy between WebSocket and HTTP backend on any language.
@expo/results - Efficient, standards-compliant library for representing results of successful or failed operations.
Emojibase - Collection of lightweight, up-to-date, pre-generated, specification compliant, localized emoji JSON datasets, regex patterns, and more.
serve-favicon - Node.js middleware for serving a favicon.
download - Download and extract files.
color2k - Color parsing and manipulation lib served in 2kB or less.
Sandstorm - Open source platform for self-hosting web apps. (Code)
transformation-matrix - JS isomorphic 2D affine transformations written in ES6 syntax.
Muuri - JavaScript layout engine that allows you to build all kinds of layouts and make them responsive, sortable, filterable, draggable and/or animated.
Split - Unopinionated utilities for resizeable split views.
Parallax Engine - Reacts to the orientation of a smart device.
fastq - Fast, in memory work queue.
ac-colors - Reactive JavaScript color library that can freely convert color formats.
sonic-boom - Extremely fast utf8 only stream implementation.
Rough Notation - Small JavaScript library to create and animate annotations on a web page. (HN)
SqueakJS - Squeak VM for the Web and Node.js. (Web)
fit-textarea - Automatically expand a <textarea> to fit its content, in a few bytes.
NanoPop - Ultra Tiny, Opinionated Positioning Engine. (Web)
Angelfire - Lets you quickly build right-click-enabled context menus and drop-down menus for any element on your webpage.
csv-parser - Streaming csv parser inspired by binary-csv that aims to be faster than everyone else.
updeep - Easily update nested frozen objects and arrays in a declarative and immutable manner.
Hull.js - JavaScript library that builds concave hull by set of points.
StegCloak - Hide secrets with invisible characters in plain text securely using passwords.
p-min-delay - Delay a promise a minimum amount of time.
match-when - Pattern matching for modern JavaScript.
NumJs - Like NumPy, in JavaScript.
spect - Reactive aspect-oriented web-framework.
js-cid - CID implementation in JavaScript.
js-ipld-block - Implementation of the Block data structure in JavaScript.
wildcard-api - Functions as API.
bpmn-js - BPMN 2.0 rendering toolkit and web modeler.
fit-curve - JavaScript implementation of Philip J. Schneider's "Algorithm for Automatically Fitting Digitized Curves" from the book "Graphics Gems".
clean-deep - Remove falsy, empty or nullable values from objects.
regular-table - Regular <table> library, for async and virtual data models.
Stimulus - Modest JavaScript framework for the HTML you already have. (Web) (Awesome)
bigpicture.js - Library that allows infinite panning and infinite zooming in HTML pages. (Web)
Tragopan - Minimal dependency-free pan/zoom library. (HN)
Deakins - Small Canvas 2D Camera.
Turbolinks - Makes navigating your web application faster.
CindyJS - Framework to create interactive (mathematical) content for the web. (Web) (HN)
axios - Promise based HTTP client for the browser and nodeJS.
astray - Walk an AST without being led astray.
vnopts - Validate and normalize options.
canvas confetti - On-demand confetti gun. (Docs)
Graphlib - JavaScript library that provides data structures for undirected and directed multi-graphs along with algorithms that can be used with them.
Dagre - JavaScript library that makes it easy to lay out directed graphs on the client-side.
ecsy - Highly experimental Entity Component System framework implemented in javascript, aiming to be lightweight, easy to use and with good performance. (Docs)
Object Visualizer - Visualize the JSON object to the DOM. (HN)
Reach Schema - Functional schema-driven JavaScript object validation library.
@cycle/callbags - Set of commonly used stream operators implemented as callbags with Typescript and ES modules.
umbrella - Broadly scoped ecosystem & mono-repository of ~135 TypeScript projects for functional, data driven development.
HTM - JSX-like syntax in plain JavaScript - no transpiler necessary.
NativeScript - Framework for building native iOS and Android apps using JavaScript and CSS.
schema-dts - JSON-LD TypeScript types for Schema.org vocabulary.
flatpickr - JS date time picker.
superjson - Safely serialize JavaScript expressions to a superset of JSON, which includes Dates, BigInts, and more.
lazy-collections - Collection of fast and lazy operations.
Perfect Arrows - Set of functions for drawing perfect arrows between points and shapes.
urlcat - URL builder library for JavaScript. (Docs)
Diagram Maker - Library to display an interactive editor for any graph-like data. (Docs) (HN)
js-coroutines - 60fps with JavaScript Coroutines for idle processing and animation.
Transducist - Ergonomic JavaScript/TypeScript transducers for beginners and experts.
decimal.js - Arbitrary-precision Decimal type for JavaScript.
Constant-Time JavaScript - Constant-time algorithms written in TypeScript.
SheetJS - Spreadsheet Data Toolkit. Read, edit, and export spreadsheets. Works in web browsers and servers. (Web)
Z - Pattern Matching for JavaScript. (Web)
Graphology - Robust & multipurpose Graph object for JavaScript & TypeScript. (Docs)
weak-napi - Make weak references to JavaScript Objects.
nestie - Tiny (211B) and fast utility to expand a flattened object.
Mock.js - Simulation data generator.
Detect features - Detect and report browser and hardware features.
JSZip - Create, read and edit .zip files with JavaScript.
Classnames - Simple javascript utility for conditionally joining classNames together.
cx - Concatenate your classes (with shortcuts).
Defer - Tiny, type-safe, JavaScript-native defer implementation.
freshie - Fresh take on building universal applications with support for pluggable frontends and backends.
Luckysheet - Online spreadsheet like excel that is powerful, simple to configure, and completely open source. (Docs)
noUiSlider - Lightweight JavaScript range slider.
QRCode.js - Cross-browser QRCode generator for JavaScript. (Web)
HyperScript - Create HyperText with JavaScript, on client or server. (Web) (HN)
hyperscript-helpers - Terse syntax for hyperscript.
EnlighterJS - Open source syntax highlighter written in pure javascript.
eslisp - S-expression syntax for JavaScript, with Lisp-like hygienic macros. Minimal core, maximally customisable.
Smoldash - Tiny lodash alternative built for the modern web.
TypewriterJS - Simple yet powerful native javascript plugin for a cool typewriter effect.
sse.js - Flexible Server Side Events source for JavaScript.
Arkit - Visualises JavaScript, TypeScript and Flow codebases as meaningful and committable architecture diagrams. (Web)
jsii - Allows code in any language to naturally interact with JavaScript classes.
proxy-memoize - Intuitive magical memoization library with Proxy and WeakMap. (Tweet)
CosmJS - Modular library consisting of multiple packages to power web experiences.
Arwes - Futuristic Sci-Fi and Cyberpunk Graphical User Interface Framework for Web Apps. (Web)
psl (Public Suffix List) - JavaScript domain name parser based on the Public Suffix List.
invariant-packages - Packages for working with invariant(condition, message) assertions.
evt - EventEmitter's typesafe replacement.
webscan - Browser-based network scanner & local-IP detection.
Pill - Add dynamic content loading to static sites with only 1 KiB of JS.
fast-deep-equal - Fastest deep equal with ES6 Map, Set and Typed arrays support.
preview-card - Customizable social media preview image.
egjs-flicking - Easy-to-use and performant infinite carousel.
SSE-Z - Slim, easy-to-use wrapper around EventSource.
DefinitelyExported - Community-defined export maps for popular npm packages.
jsdiff - JavaScript text differencing implementation.
HyperFormula - Open source, spreadsheet-like calculation engine.
fast-json-stringify - Significantly faster than JSON.stringify() for small payloads.
isbot - JavaScript module that detects bots/crawlers/spiders via the user agent.
Valtio - Makes proxy-state simple for React and Vanilla. (Demo) (How Valtio Proxy State Works)
pica - High quality image resize in browser.
Planton - Database-agnostic task scheduler.
mime-types - JavaScript content-type utility.
match-sorter - Simple, expected, and deterministic best-match sorting of an array in JavaScript.
Fetch Event Source - Better API for making Event Source requests, with all the features of fetch().
rafz - Coordinate requestAnimationFrame calls across your app and/or libraries.
p-state - Inspect the state of a promise.
v86 - x86 virtualization in JavaScript, running in your browser and NodeJS. (Web) (HN)
Notyf - Minimalistic, responsive, vanilla JavaScript library to show toast notifications.
Moveable - Draggable, Resizable, Scalable, Rotatable, Warpable, Pinchable, Groupable, Snappable.
Execa - Process execution for humans.
quick-lru - Simple “Least Recently Used” (LRU) cache.
Deepdash - Tree traversal library written in Underscore/Lodash fashion. (Docs)
Nano Delay - Tiny (25 bytes) Promise wrapper around setTimeout.
ES Module Lexer - Low-overhead lexer dedicated to ES module parsing for fast analysis.
keez - Frictionless hotkey handling for browsers.
Zet - Set() as it should be.
Ketting - Hypermedia client for JavaScript.
yocto-queue - Tiny queue data structure.
Nano JSX - Lightweight 1kB JSX library. (Web)
Effects.js - Algebraic effects in javascript with scoped handlers, multishot delimited continuations, stack safety and do notation.
flatten-js - JavaScript library for 2d geometry.
is-retry-allowed - Check whether a request can be retried based on the error.code.
backfill - JavaScript caching library for reducing build time.
S-Libs - Collection of libraries for any of JS, RxJS, or Angular.
watchpack - Wrapper library for directory and file watching.
async-tag - Resolves template literals tag values before applying a generic tag.
serialize-error - Serialize/deserialize an error into a plain object.
errorstacks - Tiny library to parse error stack traces.
Ape-ECS - Entity-Component-System library for JavaScript.
rrule.js - JavaScript library for working with recurrence rules for calendar dates as defined in the iCalendar RFC and more. (Demo)
scroller - Super-tiny library for your scrollytelling needs.
Isomorphic DOMPurify - Makes it possible to use DOMPurify on server and client in the same way.
navaid - Navigation aid (aka, router) for the browser in 850 bytes.
glob-to-regexp - Convert a glob to a regular expression.
cmap - Interactive visualization library for concept map.
lezer-tree - Incremental GLR parser intended for use in an editor or similar system.
matchit - Quickly parse & match URLs.
acorn - Tiny, fast JavaScript parser, written completely in JavaScript.
jsesc - Given some data, jsesc returns the shortest possible stringified & ASCII-safe representation of that data.
fastjson - Single-tweet, standards-compliant, high-performance JSON stack.
grfn - Tiny (~400B) utility that executes a dependency graph of async functions as concurrently as possible.
Nunjucks - Powerful templating engine with inheritance, asynchronous control, and more. (Web)
Behavior3JS - Structures and algorithms that assist you in the task of creating intelligent agents for your game or application.
qs - Querystring parser with nesting support.
Exifer - Small module that read JPEG/TIFF meta-data.
jsVideoUrlParser - JavaScript parser to extract information like provider, channel, id, start time from YouTube, Vimeo, Dailymotion, Twitch,... urls.
TypeDI - Dependency injection tool for TypeScript and JavaScript.
ibridge - Tiny, promise based, type safe library for easy, bidirectional and secure iframe communication.
Monio - Async-capable IO monad for JS.
Total.js - Excellent and stable server-side Node.js framework, client-side library for creating web applications with more than 230 UI components for free.
memoize-one - Memoization library which only remembers the latest invocation.
pjson - JSON stream parser for Go.
InternMap - Map and Set with automatic key interning.
geometry-processing-js - Fast, general-purpose framework for geometry processing on the web.
Iterplus - Best of Rust/Haskell/Python iterators in JavaScript.
SmolScroll - Tiny, flexible scroll listener with React support.
Observable parser
Robot - Functional, immutable Finite State Machine library. (Docs)
Enmap - Enhanced Map structure with additional utility methods.
Honeycomb - Create hex grids easily, in node or the browser.
chunkify - Split an iterable into evenly sized chunks.
wobble - Tiny spring physics micro-library that models a damped harmonic oscillator.
tmp-cache - Least-recently-used cache in 35 lines of code.
static-eval - Evaluate statically-analyzable expressions.
Sparse Octree - Sparse, pointer-based octree data structure.
Signature Pad - JavaScript library for drawing smooth signatures.
dom-to-image-retina - dom-to-image but generates high-resolution images.
loglevel - Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods.
Perfect Freehand - Draw perfect freehand lines. (Demo)
Alo - Full-fledged state management. (Docs)
Form-Data - Library to create readable "multipart/form-data" streams. Can be used to submit forms and file uploads to other web applications.
conf - Simple config handling for your app or module.
gifenc - Fast and lightweight pure-JavaScript GIF encoder.
tldts - Blazing Fast URL Parsing.
Barba.js - Easy-to-use library that helps you create fluid and smooth transitions between your website's pages.
Shuffle.js - Categorize, sort, and filter a responsive grid of items. (Web)
stdlib - Standard library for JavaScript and Node.js. (Web)
gensync - Allows users to use generators in order to write common functions that can be both sync or async.
monet.js - Monadic types library for JavaScript.
VivaGraph - Graph drawing library for JavaScript.
Crochet - Small engine for story-driven games.
diary - Zero-dependency, fast logging library for both Node and Browser.
tinydate - Tiny reusable date formatter.
FingerprintJS - Browser fingerprinting library with the highest accuracy and stability.
Antiutils - TypeScript/JavaScript utilities for those who don't like utilities.
linked-list - Minimalistic linked lists.
msgpack-javascript - JavaScript implementation of MessagePack, an efficient binary serilization format.
Tagify - Lightweight, efficient Tags input component.
betterator - Better sync and async iterator API.
XState Catalogue - Professionally designed, interactive state machines. (Web)
Combine-Promises - Like Promise.all(array) but with an object instead of an array.
async-retry - Retrying made simple, easy, and async.
party.js - JavaScript library to brighten up your user's site experience with visual effects.
Scule - String case utils.
Nano Events - Simple and tiny event emitter library for JavaScript.
stoplight/yaml - Useful functions when working with YAML.
Safe Await - Safely use async/await without all the try catch blocks.
Casbin.js - Authorization library that supports access control models like ACL, RBAC, ABAC in Frontend JavaScript.
tidy.js - Tidy up your data with JavaScript, inspired by dplyr and the tidyverse.
keypather - Get, set, or delete deep object values using keypath strings (supports immutable operations) and more.
Veramo - JavaScript Framework for Verifiable Data. (Web)
it - Utility modules to make dealing with async iterators easier.
DiceBear - Avatar library for designers and developers. (Web)
JParticles - Concise, lightweight, and efficient Canvas library for building some cool particle effects. (Web)
Arquero - Query processing and transformation of array-backed data tables.
TypeIt - Most versatile JavaScript animated typing utility on the planet. (Web)
ASON - Data oriented algorithm designed for compact and speedy storage of AssemblyScript objects in a binary format.
refractor - Lightweight, robust, elegant virtual syntax highlighting using Prism.
Expounder - Library for explaining things in HTML.
timidity - Play MIDI files in the browser w/ Web Audio, WebAssembly, and libtimidity.
buffer - Buffer module from node.js, for the browser.
pixi-graph - Graph visualization library using PIXI.js and Graphology.
xache - Auto expiring, max sizable cache.
ndarray - Modular multidimensional arrays for JavaScript.
LUME AutoLayout - Apple’s Auto Layout for JavaScript. (HN)
Zoomtastic - Tiny image zoomer for web.
Patronum - Effector operators library delivering modularity and convenience.
Cabin - Best JavaScript and Node.js logging service and logging npm package.
Normalized Cache - Cache for storing normalized data.
itty router - Router, designed for Express.js-like routing within Cloudflare Workers (or anywhere else).
vLitejs - Fast and lightweight JavaScript library for customizing video and audio player.
async-broadcaster - Observable alternative using async iterators.
Hover Effect - JavaScript library to draw and animate images on hover.
Js Search - Efficient, client-side search library for JavaScript and JSON objects.
js-worker-search - Full text client-side search based on js-search but with added web-worker support for better performance.
domino - Server-side DOM implementation based on Mozilla's dom.js.
Momoa JSON - JSON parser, tokenizer, traverser, and printer.
js-confetti - JS Confetti library that supports emojis.
quetie - Cutest and tiniest queue/deque implementation.
p-map - Map over promises concurrently.
jsBezier - Bezier curve helper functions for JavaScript.
hydrate-text - Tiny library for dynamic text hydrating with variables.
JS Image Carver - Content-aware image resizer and object remover based on Seam Carving algorithm.
Acorn-JSX - Alternative, faster React.js JSX parser.
Tempura - Light, crispy, and delicious template engine.
async-cache-dedupe - Async cache with dedupe support.
DOM to Image - Generates an image from a DOM node using HTML5 canvas.
Dinero.js - Create, calculate, and format money safely in JavaScript and TypeScript.
proxied-worker - Tiny utility to asynchronously drive a namespace exposed through a Worker.
FZF for JavaScript - Do fuzzy matching using FZF algorithm in JavaScript. (Web)
ganja.js - Geometric Algebra for JavaScript.
TextKit - Framework for creating Textual Graphics.
spacers - JS library that supports multiple spacers for controlling padding/margin, linking functionality & much more.
CCapture.js - Library to capture canvas-based animations.
All Origins - Pull contents from any page via API (as JSON/P or raw) and avoid Same-origin policy problems.
Univrse.js - Universal schema for data serialization, signing and encryption. (Web)
mississippi - Collection of useful stream utility modules for writing better code using streams.
TinyEvents - Tiny event utility library.
lightGallery - Lightweight, modular, JavaScript image and video lightbox gallery plugin. Available for React.js, Vue.js, Angular, and TypeScript. (Web)
Cropper.js - JavaScript image cropper. (Web)
JavaScript Cookie - Simple, lightweight JavaScript API for handling cookies.
Bisect - Bisect your async job into two steps, first perform work in background and then commit the work.
AG Grid - Best JavaScript Data Table for building Enterprise Applications. (Web)
events-to-async - Treat EventEmitter-like object using Async/Await and Async Iterator.
gfxrlz - Modern-styled, low-level graphics API for the web.
PCUI Graph - JavaScript library for creating node-based graphs.
Detect It - Detect if a device is mouseOnly, touchOnly, or hybrid, and if the primary input is mouse or touch. (Web)
zen-observable - Implementation of Observables for JavaScript.
has-pkg - Check if a package is installed locally.
js-lru - Fast, simple & universal Least Recently Used (LRU) map for JavaScript.
vscode-uri - URI implementation that is used in VS Code and its extensions.
Dotto.x - Tiny state manager for React, Svelte, and vanilla JS.
calendarize - Tiny (202B) utility to generate calendar views.
pdfAnnotate - JavaScript library for creating annotations in PDF documents.
Consola - Elegant Console Logger for Node.js and Browser.
ohmyfetch - Better fetch API. Works on node, browser and workers.
Tingle.js - Vanilla modal plugin, no dependencies and easy-to-use.
Borsh JS - TypeScript/JavaScript implementation of Binary Object Representation Serializer for Hashing.
set-value - Set nested properties on an object using dot-notation.
parquet.js - Fully asynchronous, pure JavaScript implementation of the Parquet file format.
jlottie - Small-footprint lottie player in JavaScript.
cosmiconfig - Find and load configuration from a package.json property, rc file, or CommonJS module.
Tocca.js - Super lightweight script ( ~1kB ) to detect via Javascript events like 'tap' 'longtap' 'dbltap' 'swipeup' 'swipedown' 'swipeleft' 'swiperight' on any kind of device.
fast-base64 - Fastest base64 on the web, with Wasm + SIMD.
Nano Colors - Tiny and fast Node.js library for formatting terminal text with ANSI colors. (Template) (HN) (Chalk maintainer's thoughts) (Tweet)
picocolors - 2x times faster than nanocolors and use 2x less space in node_modules. (Tweet)
yoctocolors - Smallest and fastest command-line coloring package on the internet. Trust me.
Fractional Indexing - Technique to create an ordering that can be used for Real time Editing of Ordered Sequences.
Atrament - Small JS library for beautiful drawing and handwriting on the HTML Canvas. (Web)
clipboardy - Access the system clipboard (copy/paste).
paintvec - JavaScript 2D vector math library.
Audio Recorder Polyfill - MediaRecorder polyfill to record audio in Edge and Safari.
IPO - Easing library allowing to describe complex easings in JSON.
JSXGraph - Dynamic Mathematics with JavaScript (Web) (HN)
Vector Graph - Generate high-quality geometry and vector graphs with HTML.
TweenTime - JavaScript timeline.
Micromodal.js - Tiny JavaScript library for creating accessible modal dialogs. (Docs)
Postal.js - JavaScript pub/sub library supporting advanced subscription features, and several helpful add-ons.
slugo - Smallest possible slug utility for Node.js and Browser.
Dry - Superset of the Liquid templating language, with first-class support for advanced inheritance features, and more.
Bloom-Filters - JS implementation of probabilistic data structures: Bloom Filter (and its derived), HyperLogLog, Count-Min Sketch, Top-K and MinHash.
Session Resume - Annotate fields to be persisted on navigation away from the current page.
Atropos - Lightweight, free and open-source JavaScript library to create stunning touch-friendly 3D parallax hover effects. (Web)
Graph Dracula - JavaScript Graph Library.
date-io - Abstraction over common JavaScript date management libraries.
sdf-csg - Generate meshes from signed distance functions and constructive solid geometry operations.
littlefoot - Lightweight JavaScript library that creates exceptional footnotes. (Web)
tzdb - Simplified, grouped and always up to date list of time zones, with major cities.
Lazyframe - Dependency-free library for lazyloading iframes.
msgpack-lite - Fast Pure JavaScript MessagePack Encoder and Decoder.
medium-zoom - JavaScript library for zooming images like Medium. (Web)
PureImage - Pure JS implementation of an image drawing and encoding api, based on HTML Canvas.
vanilla-hamburger - Animated hamburger menu icons for modern web apps. (Web)
editable.js - JavaScript API that defines a friendly and browser-consistent content editable interface.
Fireworks.js - Simple fireworks library.
module-error - Create errors with code and cause properties.
InfiniteGrid - Module used to arrange card elements including content infinitely on a grid layout. (Web)
Okiba - Sharp collection of tools for front-end development, created with performance in mind.
FastPriorityQueue.js - Fast heap-based priority queue in JavaScript.
Autobee - Multiwriter Hyperbee comprised of multiple input Hyperbees using Autobase and Hypercore 10.
std-env - Detect current JavaScript environment.
Nova Text Tools - Swiss Army knife for text manipulation and selection.
Ninja Keys - Keyboard shortcuts interface for your website. Working with static HTML, Vanilla JS, Vue, React, Svelte.
remoteStorage.js - JavaScript library for storing user data locally in the browser, as well as connecting to remoteStorage servers and syncing data across devices and applications. (Docs)
JS Data Structures
Oby - Tiny Observable implementation. (Tweet)
trkl - Reactive JavaScript programming in less than half a kilobyte.
Microdiff - Fast, zero dependency object and array comparison library. (HN) (Article)
lfi - Lazy functional iteration library supporting sync, async, and concurrent iteration.
Speed Highlight JS - Light, fast, and easy to use, dependencies free javascript syntax highlighter.
Proload - Searches for and loads your tool's JavaScript configuration files.
Sticksy.js - Zero-dependency JavaScript library that sticks your elements to the top until they reaching the bottom.
Async Tasks Runner - Super tiny (< 1kb gzipped), side-effect free, tree shakable, zero dependencies, and fully typed Tasks Runner.
ULID JS - Universally Unique Lexicographically Sortable Identifier.
Avsc - Avro for JavaScript.
msgpackr - Ultra-fast MessagePack implementation with extension for record and structural cloning.
Lib0 - Monorepo of isomorphic utility functions.
node-stdlib-browser - Node standard library for browser.
parse-json - Parse JSON with more helpful errors.
cuid - Collision-resistant ids optimized for horizontal scaling and performance.
Spacing JS - JavaScript utility for measuring the spacing between elements on webpage.
co-share - JavaScript library for easily building shared applications such as chats and games. (Tweet)
bellboy - Highly performant JavaScript data stream ETL engine.
fnv-plus - JavaScript FNV-1a Hash Algorithm (up to 1024 bit) implementation.
remote-web-streams - Web streams that work across web workers and iframes.
web-streams-adapter - Adapters for converting between different implementations of WHATWG Streams.
pan-zoom - Panning and zooming events for any target.
bind-event-listener - Utility to make binding and (especially) unbinding DOM events easier.
Chrono - Natural language date parser in JavaScript.
CAF - Cancelable Async Flows.
queue-microtask - Fast, tiny queueMicrotask shim for modern engines.
Cerbero - Simple js library that gives you the ability to track everything your users are doing on your web page.
Two.js - Renderer agnostic two-dimensional drawing api for the web. (Docs)
markup-it - JavaScript library to parse and serialize markup content (Markdown and HTML).
h3-js - JavaScript version of H3, a hexagon-based geospatial indexing system.
Floating UI - JavaScript positioning library for tooltips, popovers, dropdowns, and more. (Web) (Twitter)
flow-field - Library for generating flow fields.
taki - Take a snapshot of any website.
Zooming - Image zoom that makes sense.
Moo - Highly-optimized tokenizer/lexer generator. Use it to tokenize your strings, before parsing 'em with a parser.
deeplinks.js - Simple deep links to any selection of text on your website.
piecemeal - Send your data piecemeal.
stacktrace.js - Generate, parse, and enhance JavaScript stack traces in all web browsers.
double.js - Double-double arithmetic in JavaScript. A floating point expansion with 31 accurate decimal digits.
dotparser - Parser of GraphViz dot file format.
bitECS - Functional, minimal, data-oriented, ultra-high performance ECS library written using JavaScript TypedArrays.
ocean.js - JavaScript library to privately & securely publish, exchange, and consume data.
diagram-js - Toolbox for displaying and modifying diagrams on the web.
Swear - Flexible promise handling with JavaScript.
OpenSeadragon - Open-source, web-based viewer for zoomable images, implemented in pure JavaScript. (Web)
Atomically - Read and write files atomically and reliably.
point-in-polygon - Determine if a point is inside of a polygon.
Eruda - Console for Mobile Browsers. (Web)
fast-redact - Serializes an object with JSON.stringify, censoring any data at paths specified.
fast-safe-stringify - Safe and fast serialization alternative to JSON.stringify.
createContent - Cross browser utility to create HTML or SVG runtime content.
templite - Lightweight templating in 150 bytes.
ml-matrix - Matrix manipulation and computation library.
env-paths - Get paths for storing things like data, config, cache, etc.
Draggabilly - Make elements draggable.
flattie - Tiny (203B) and fast utility to flatten an object with customizable glue.
Zoomist - JavaScript library for zooming image.
canvas-capture - Record the canvas as an image, mp4 video, or GIF from the browser.
hardtack - Ultra-light library for working with cookies in JavaScript.
Eta - Embedded JS template engine for Node, Deno, and the browser. Lighweight, fast, and pluggable. Written in TypeScript. (Web)
Vanta JS - Animated 3D backgrounds for your website. (Web) (HN)
standardized-audio-context - Cross-browser wrapper for the Web Audio API which aims to closely follow the standard.
worker-timers - Replacement for setInterval() and setTimeout() which works in unfocused windows.
Swiper - Most modern mobile touch slider with hardware accelerated transitions. (Web)
flat - Flatten/unflatten nested JavaScript objects.
AMQP Node
Drawflow - Create data flows easily and quickly.
find-up - Find a file or directory by walking up parent directories.
Stretchy - Form element autosizing, the way it should be. (Code)
it-pipe - Utility to "pipe" async iterables together.
Polyglot.js - Give your JavaScript the ability to speak many languages.
merge-images - Easily compose images together without messing around with canvas.
Faker - Generate massive amounts of fake data in the browser and node.js.
FxJS - Functional Extensions for JavaScript.
dequal - Tiny utility to check for deep equality.
bin-wrapper - Binary wrapper that makes your programs seamlessly available as local dependencies.
base2048 - Binary encoding optimized for transmitting data through Twitter.
sube - Subscribe to any reactive source.
hm-def - Runtime type checking for JS with Hindley Milner signatures.
cRonstrue - JavaScript library that converts CRON expressions into human readable descriptions.
Hyperactiv - Super tiny reactive library.
JsonHilo.js - Fast lossless JSON parse event streaming, in JavaScript.
most - Ultra-high performance reactive programming.
expandify - Simple express.js tool to evaluate expressions in HTML templates.
remark-shiki - Highlight code blocks in markdown with shiki.
better-eval - Alternative to 'eval' in JavaScript that is customizable and safer.
resolve.exports - Tiny (737b), correct, general-purpose, and configurable "exports" resolver without file-system reliance.
Peggy - Parser generator for JavaScript. (Web)
zip.js - JavaScript library to zip and unzip files in the browser and Deno.
Data-oriented Serialization for SoA/AoS - Serialization library for data-oriented design structures.
node-ffmpeg-installer - Platform independent binary installer of FFmpeg for node projects.
Smoothie Charts - Small charting library designed for live streaming data.
tar-stream - Streaming tar parser and generator.
tar-fs - fs bindings for tar-stream.
get-stream - Get a stream as a string, buffer, or array.
pump - Pipe streams together and close all of them if one of them closes.
TogetherJS - Service for your website that makes it surprisingly easy to collaborate in real-time.
emoji-translate - Translate text to emoji.
peer-cdn - Lightweight library providing peer to peer CDN functionality.
magic-string - Manipulate strings like a wizard.
fdir - Fastest directory crawler & globbing library for NodeJS. Crawls 1m files in < 1s.
HLS.js - JavaScript library that plays HLS in browsers with support for MSE.
rec.la - Loopback domain and SSL certs.
to-json-schema - Converts JS objects to JSON Schema.
vercel/fetch - Opinionated fetch (with retrying and DNS caching) optimized for use inside microservices.
KeyboardJS - JavaScript library for binding keyboard combos without the pain of key codes and key combo conflicts.
Koder - QR/bar code scanner for the Browser.
cors-bypass - Bypass the browsers CORS restrictions, without needing to setup a server-side proxy.
rehype-raw - Plugin to parse the tree (and raw nodes) again, keeping positional info okay.
micromatch - Highly optimized wildcard and glob matching library.
BufferBackedObject - Buffer-backed objects in JavaScript.
curtains.js - Lightweight vanilla WebGL JavaScript library that turns HTML DOM elements into interactive textured planes.
Martinez-Rueda - Martinez-Rueda polygon clipping algorithm, does boolean operation on polygons.
actor - Library for managing concurrent effects using generators.
fast-json - Lightning fast on the fly JSON parser.
noble-hashes - Audited & minimal JS implementation of SHA2, SHA3, RIPEMD, BLAKE2/3, HMAC, HKDF, PBKDF2 & Scrypt.
sweetalert2 - Beautiful, responsive, highly customizable and accessible (WAI-ARIA) replacement for JavaScript's popup boxes. Zero dependencies.
openapi-client-axios - JavaScript client library for consuming OpenAPI-enabled APIs with axios.
Alias HQ - End-to-end solution for configuring, refactoring, maintaining and using path aliases.
record-cache - Cache optimized for record like things like host:port or domain.names.
UAParser.js - JavaScript library to detect Browser, Engine, OS, CPU, and Device type/model from User-Agent data with relatively small footprint.
p-lazy - Create a lazy promise that defers execution until it's awaited or when .then() or .catch() is called.
priority-queue - Performant heap-based priority queue implementation in JS.
Tiny-Swiper - JavaScript Carousel powered by wonderful plugins with native-like experience.
ga-lite - Smaller, cacheable subset of Google Analytics JS client.
lru-cache - Cache object that deletes the least-recently-used items.
XRegExp - Extended JavaScript regular expressions.
JSON Schema Faker - Use JSON Schema along with fake generators to provide consistent and meaningful fake data for your system.
observable-prerender - Pre-render Observable notebooks for automation.
Browser-FS-Access - File System Access API with legacy fallback in the browser.
js-libp2p-floodsub - Also known as pubsub-flood or just dumbsub, this implementation of pubsub focused on delivering an API for Publish/Subscribe, but with no CastTree Forming.
js-libp2p-tcp - JavaScript implementation of the TCP module that libp2p uses that implements the interface-transport spec.
Title - Service for capitalizing your title properly.
vercel-toast - Framework-agnostic vercel design's toast component.
color-convert - Plain color conversion functions in JavaScript.
Aurora.js - JavaScript audio decoding framework.
kappa-core - Minimal peer-to-peer database, based on kappa architecture.
Parcel's source-map - Fast source map manipulation, generation and consumption library written in Rust and Node.js.
imagesLoaded - JavaScript is all like "You images done yet or what?". (Web)
long.js - Long class for representing a 64-bit two's-complement integer value.
fast-jwt - Fast JSON Web Token implementation.
string-width - Get the visual width of a string - the number of columns required to display it.
apexcharts.js - Interactive JavaScript Charts built on SVG.
letMeScroll - Scroll made easy.
Flowed - Fast and reliable flow engine for orchestration and more uses in Node.js, Deno and the browser.
Zipson - JSON parse and stringify with compression.
text-field-edit - Insert text in a <textarea> and <input> (including Undo in most browsers).
Jump.js - Modern smooth scrolling library.
ringbuf.js - Wait-free thread-safe single-consumer single-producer ring buffer using SharedArrayBuffer.
Env - Utility for verifying that environment variables are present in Node.js and Deno.
devtools-detect - Detect if DevTools is open and its orientation.
clb - Small, utility function that builds a class list based on a simple API.
Compatto - Tiny and fast string compression library.
LemonadeJS - Micro (6Kb) reactive, with a two-way data binding, no dependencies, JavaScript library that aims to be as close to JavaScript Vanilla as possible.
undom - Minimally viable DOM Document implementation.
element-in-view - Check if an element is in viewport.
remark-directive - Remark plugin to support directives.
ffmpeg.js - Provides FFmpeg builds ported to JavaScript using Emscripten project.
Jison - API for creating parsers in JavaScript.
primitive-geometry - Geometries for 3D rendering, including normals, UVs and cell indices (faces).
many-level - Share an abstract-level database over the network or other kind of stream.
local-storage-proxy - Work with window.localStorage as if it were an object.
write-pkg - Write a package.json file.
KDBush - Fast static index for 2D points.
X6 - JavaScript diagramming library that uses SVG and HTML for rendering.
globby - User-friendly glob matching.
TreeModel - Manipulate and traverse tree-like structures in JavaScript.
fast-json-stable-stringify - Deterministic JSON.stringify.
loopbench - Benchmark your event loop.
Isomorphic Layout Composer (ILC) - Layout service that composes a web page from fragment services. It supports client/server-based page composition.
esx - High throughput React Server Side Rendering.
modern-async - Modern JavaScript tooling library for asynchronous operations using async/await, promises and async generators.
BSL - Body scroll locking that just works with everything.
flatqueue - Very fast and simple JavaScript priority queue.
Hasha - Hashing made simple. Get the hash of a buffer/string/stream/file.
json-tree - JS library that creates an HTML navigable tree from JSON object.
Easy Dates - Super lightweight library for working with dates.
multistream - Stream that emits multiple other streams one after another.
unified-language-server - Create a language server based on unified ecosystems.
ESQuery - ECMAScript AST query library.
Prexit - Graceful way to shutdown / handle process exit.
Codsen JS packages
Word Cloud Layout - Create word clouds in JavaScript.
encoding.js - Convert or detect character encoding in JavaScript.
Sugar High - Super lightweight JSX syntax highlighter, around 1KB after minified and gzipped.
jsperf.dev - Monorepo collection of JavaScript performance libraries.
flatstr - Flattens the underlying C structures of a concatenated JavaScript string.
ipaddr.js - IPv6 and IPv4 address manipulation library.
DataGridXL - Excel-like Experience for Web Apps. (Web) (HN)
rope-sequence - Persistent sequence data structure.
Wild Wild Path - Object property paths with wildcards and regexps.
get-dep-tree - Get a dependency tree for a package.
debugging-stream - Debug streams, by adding latency etc.
Simple Statistics - JavaScript implementation of descriptive, regression, and inference statistics. (Web)
Simple Linear Regression
Diff Match Patch - High-performance library in multiple languages that manipulates plain text.
Nitro - Build and deploy universal JavaScript servers.
Channel - Go-like channels for JavaScript.
big-json - Stream based implementation of JSON.parse and JSON.stringify.
FPO - FP library for JavaScript. Supports named-argument style methods.
cacheable-request - Wrap native HTTP requests with RFC compliant cache support.
pocket.io - Minimalistic version of socket.io that weights about 1K instead of 60K.
escape-goat - Escape a string for use in HTML or the inverse.
Template Parts - Implementation of the Template Parts proposal.
Iterators - Standard library iterator utilities.
MojiScript - Async-first, opinionated, and functional library.
destr - Faster, secure and convenient alternative for JSON.parse.
ensdomains/ui - Reusable functions and components for the ENS apps.
Golden Layout - Multi window layout manager for web apps.
nano-memoize - Faster than fast, smaller than micro ... nano-memoizer.
YAML - JavaScript parser and stringifier for YAML.
JW Player - Solution for seamless video playback across browsers and media types.
dgrid - Lightweight, mobile-ready, data-driven, modular grid widget designed for use with dstore. (Web)
SimpleBar - Custom scrollbars vanilla JavaScript library with native scroll, done simple, lightweight, easy to use and cross-browser.
PEG.js - Parser generator for JavaScript.
Yjs Protocols - Binary encoding protocols for syncing, awareness, and history information.
radix3 - Lightweight and fast router for JavaScript based on Radix Tree.
tinyqueue - Smallest and simplest binary heap priority queue in JavaScript.
protomux - Multiplex multiple message oriented protocols over a stream.
exifr - Fastest and most versatile JS EXIF reading library.
libhoney - Node.js module for sending events to Honeycomb, a service for debugging your software in production.
ejs - Embedded JavaScript templates.
Delaunator - Incredibly fast JavaScript library for Delaunay triangulation of 2D points.
unist-util-select - Utility to select unist nodes with CSS-like selectors.
Locomotive Scroll - Detection of elements in view port & smooth scrolling with parallax effects. (Code)
LiquidJS - Simple, expressive and safe template engine. (Web)
Piling.js - General framework and library for exploring thousands of small multiples. (Web)
Draggable - Get complete control over drag and drop behavior.
Cuberto Mouse Follower - Powerful JS library to create amazing and smooth effects for the mouse cursor on your website.
delegate-it - Lightweight event delegation.
ip-address - Library for validating and manipulating IPv4 and IPv6 addresses in JavaScript.
minimatch - Minimal matching utility.
Scroller - Fast, light-weight, and dependency-free content scroller.
Rambdax - Extended version of Rambda.
env-schema - Validate your env variable using Ajv and dotenv.
minipass - Minimal implementation of a PassThrough stream.
compile-json-stringify - Compile a JSON.stringify() function with type hints for maximum performance.
hanabi - Highlight any code, in a colorful way.
set-cookie-parser - Parse HTTP set-cookie headers in JavaScript.
el-transition - Apply Enter/Leave transitions.
webreflection/json-watch - Proxy based alternative to json-watch module.
AST Query - Simple JavaScript AST modification library.
Handlebars.js - Minimal templating on steroids.
collect.js - Convenient and dependency free wrapper for working with arrays and objects.
typeson.js - Preserves types over JSON, BSON or socket.io.
json2html - JavaScript library that uses js templates to render JSON objects into HTML.
json2csv - Converts JSON into CSV with column titles and proper line endings.
GLightbox - Pure JavaScript lightbox with mobile support. It can handle images, videos with autoplay, inline content and iframes.
Twig.js - JS implementation of the Twig Templating Language.
Atomic Agents - Spatial Agent-based Modeling in JavaScript.
is-online - Check if the internet connection is up.
wild-wild-utils - Functional utilities using object property paths with wildcards and regexps.
pattern-match-2d.js - Algorithm for fast 2D pattern-matching with wildcards.
reachable-url - Given an URL, it resolves as fast as possible, performing a GET without downloading the body.
urllib - Request HTTP(s) URLs in a complex world.
Bertin.js - JavaScript library for visualizing geospatial data and make thematic maps for the web.
EDTF.js - Extended Date Time Format (ISO 8601-2 / EDTF) Parser for JavaScript.
neodrag - Lightweight multi-framework libraries for draggability on the web.
object-hash - Generate hashes from JS objects in node and the browser.
Proxly - Proxy any list of objects or functions to a single entity.
nanoutils - Tiniest FP-friendly JavaScript utils library.
Slidy - Simple, configurable, nested & reusable sliding action script with templates, animations, easings & some useful plugins.
cloneable-readable - Clone a Readable stream, safely.
ASTq - Abstract Syntax Tree (AST) Query Engine. (HN)
virtual-scroll - Low-level library to create custom scroll behaviors.
lazyfill - Polyfills on demand.
retry - Abstraction for exponential and custom retry strategies for failed operations.
JointJS - Flexible JavaScript library for building interactive SVG-based diagrams and visual applications.
Toposort - Topologically sort directed acyclic graphs (such as dependency lists) in JS.
Pool - Like Promise.all but you can specify how many concurrent tasks you want at once.
Chokidar - Minimal and efficient cross-platform file watching library.
ky-universal - Use Ky in both Node.js and browsers.
90's Cursor Effects - Old-school cursor effects for your browser built with modern JavaScript.
Spacetime - Lightweight JS timezone library.
ELK - ELK's layout algorithms for JavaScript.
multiaddr - JavaScript implementation of multiaddr.
file-type - Detect the file type of a Buffer/Uint8Array/ArrayBuffer.
rdflib.js - Linked Data API for JavaScript.
array-keyed-map - JS data structure, like Map, but the keys are arrays.
OpenTelemetry JavaScript - OpenTelemetry instrumentation for JavaScript modules.
OpenTelemetry API for JavaScript
Prolly Trees - Implementation of peer-to-peer search trees (probabalistic b-trees trees) as used in dolt and noms.
abcjs - JavaScript library for rendering standard music notation in a browser.
object-sizeof - Get size of a JavaScript object.
fmu - Collection of JS module utilities written in Rust.
Constrain - Responsive, animated figures in JavaScript/HTML canvases. (HN)
probe-image-size - Get image size without full download. Supported image types: JPG, GIF, PNG, WebP, BMP, TIFF, SVG, PSD, ICO.
nkeys.js - Public-key signature system based on Ed25519 for the NATS ecosystem system for JavaScript.
p-timeout - Timeout a promise after a specified amount of time.
safe-json-value - JSON serialization should never fail.
Config Array - Glob-based configuration array utility.
p-cancelable - Create a promise that can be canceled.
neat-csv - Fast CSV parser.
xdg-app-paths - Determine (XDG-compatible) paths for storing application files (cache, config, data, etc).
evemin - Modern and blazing fast event emitter.
Buffer for Array - Bridging the gap between buffers and typed arrays.
joycon - Find and load config files with joy.
SAT.js - Simple JavaScript library for performing 2D collision detection.
Cookie Consent - Simple cross-browser cookie-consent plugin written in vanilla JS.
Tether - positioning engine to make overlays, tooltips and dropdowns better.
search-index - Persistent, network resilient, full text search library for the browser and Node.js.
delay - Delay a promise a specified amount of time.
aggregate-error - Create an error from multiple errors.
Lenis - How smooth scroll should be. (Web)
polybooljs - Boolean operations on polygons (union, intersection, difference, xor).
usignal - Alternative to @preact/signals-core.
multiformats - Multiformats interface (multihash, multicodec, multibase and CID).
cubing.js - Library with modules for displaying and working with twisty puzzles.
value-ref - Value reference with reactivity.
ready-resource - Modern single resource management.
Split2 - Stream and reassemble it so that each line is a chunk.
Flow - Node-Graph, lightweight, cross-browser UI library.
Postmate - Powerful, simple, promise-based postMessage iFrame communication library.
PhotoSwipe - JavaScript image gallery for mobile and desktop, modular, framework independent. (Web)
serialize-anything - Serialize and de-serialize all JavaScript data types.
DragSelect - Easy JS drag-select and drop functionality done right.
Croner - Trigger functions and/or evaluate cron expressions in JavaScript. No dependencies. Most features. All environments.
async-ratelimiter - Rate limit made simple, easy, async.
Error Causes - Simple error handling based on standard JavaScript error cause.
Fast Diff - Fast JavaScript string diff.
Day.js - Fast 2kB alternative to Moment.js with the same modern API. (Web) (HN)
Shaka Player - JavaScript player library / DASH & HLS client / MSE-EME player.
js-sha1 - Simple SHA1 hash function for JavaScript supports UTF-8 encoding.
mustache.js - Zero-dependency implementation of the mustache template system in JavaScript.
Blaze Slider - High-performance JavaScript UI library for creating sliders. (Web)
hapi/iron - Encapsulated tokens (encrypted and mac'ed objects).
slug - Slugifies strings, even when they contain Unicode.
is-executable - Check whether a file can be executed.
uuid-readable - Generate Easy to Remember, Readable UUIDs, that are Shakespearean and Grammatically Correct Sentences.
JSON-URL - Compress JSON into compact base64 URI-friendly notation.
JSON-API-Serializer - Node.js/browser framework agnostic library for serializing your data to JSON API compliant responses.
watching-you - JS library for building animations that watch anything on DOM. (HN)
fast-json-clone - Tiny library to clone JSON values in pure JavaScript focusing on the speed.
geotic - Entity Component System library for JS.
Klipse - JavaScript plugin for embedding interactive code snippets in tech blogs.
hastscript - Utility to create hast trees.
capture-stack-trace - Ponyfill for Error#captureStackTrace.
TourGuide - JavaScript library written for creating user tours and on-boarding steps for your apps.
Scroll Based Animation
fsxx - File system in zx style.
WorkerBox - Run unsafe user generated JavaScript in the browser. (HN)
glsl-autodiff - Get normals in your vertex shader.
devalue - Gets the job done when JSON.stringify can't.
Try to Catch - Functional try-catch wrapper for promises.
idle-task - Improve your website performance by executing JavaScript during a browser's idle periods. (HN)
wildcard-match - Tiny and extremely fast JavaScript library for compiling and matching basic glob patterns.
ESX as Template Literal Tag - Template literal based ESX proposal.
meta-png - JavaScript library to store and retrieve metadata in PNG files.
request-compose - Composable HTTP Client.
esm-env - Uses export conditions to return environment information in a way that works with major bundlers and runtimes.
import.meta.env - Startup/Runtime environment variable solution for JavaScript.
Socket Config - Reader/parser/validator tool for Socket.dev's socket.yml configuration files.
Twitter Regexp - Twitter precompiled regular expressions.
EventEmitter3 - High performance EventEmitter.
Fuzzyset - Fuzzy string set for JS.
ffjavascript - Finite Field Library in JavaScript.
HR.js - Tiny JavaScript plugin for highlighting and replacing text in the DOM.
Watcher - File system watcher that strives for perfection, with no native dependencies and optional rename detection support.
tiny-fs-native - Native FS for JavaScript.
jsonld.js - JSON-LD Processor and API implementation in JavaScript.
swiped-events - Adds swiped events to the DOM in 1k of pure JavaScript.
long-press-event - Adds long-press event to the DOM in 1k of pure JavaScript.
jStat - JavaScript Statistical Library.
NightVision - Highly customizable charting library, created for professional traders.
Webspace Engine - Create 3D worlds using just HTML.
Sortable - JavaScript library for reorderable drag-and-drop lists.
active-win - Get metadata about the active window (title, id, bounds, owner, etc).
unfetch - Bare minimum 500b fetch polyfill.
debounce-fn - Debounce a function.
Mime - Comprehensive, compact MIME type module.
LDT - Lightweight in browser syntax highlighting.
js-tokens - Tiny JavaScript tokenizer.
rregex - WebAssembly build of Rust Regex for JavaScript.
Cuid2 - Secure, collision-resistant ids optimized for horizontal scaling and performance. Next generation UUIDs.
throat - Throttle a collection of promise returning functions.
Rempl - Framework for moderated access with custom UI to remote JavaScript runtime.
GScroll - Simple smooth scroll based on GSAP library.
Cookie Consent - Lightweight & GDPR compliant cookie consent plugin written in plain JS.
hast-util-to-jsx-runtime - Hast utility to transform a tree to preact, react, solid, svelte, vue, etc., with an automatic JSX runtime.
Graph - Graph & Directed Graph implementation in JS.
User-Routine - JavaScript library to automate user routines on web pages.
uuid - Generate RFC-compliant UUIDs in JavaScript.
Origami - JavaScript library for modeling origami.
emoji-palette - Get color palettes from emojis.
Scrub - Video scrubbing with WebCodecs.
iter-tools - Comprehensive suite of utility methods for working with JS iterables and async iterables.
JS Graph Algorithms
globrex - Glob to regular expression with support for extended globs.
Warp.js - Warp, distort, bend, twist and smudge your SVG’s directly in the browser.
is-animated - Checks if image is animated.
Zeptomatch - Absurdly small glob matcher that packs a punch.
rfdc - Really Fast Deep Clone.
normalize-url - Useful when you need to display, store, deduplicate, sort, compare, etc, URLs.
url-regex - Regular expression for matching URLs.
ScrollyVideo.js - Components for scroll-based (or other externally controlled) playback.
render-media - Intelligently render media files in the browser.
Nonchalance - Easiest way to augment DOM builtin elements.
hrbrbox - JS tools primarily intended to simplify some operations in Observable notebooks.
cborg - Fast CBOR with a focus on strictness.
Interval Tree - Interval binary search tree.
u - JavaScript library for encoding/decoding state (JavaScript object) in URL.
signal - Extremely basic signals implementation.
JSum - Consistent checksum calculation of JSON objects.
slugify - Useful for URLs, filenames, and IDs.
ExifReader - JavaScript Exif info parser.
custom-function - Literally the only sane way, if not the fastest one, to extend the Function class without evaluation.
store - Better way to use localStorage and sessionStorage.
EasyStar.js - HTML5/JavaScript Pathfinding Library.
import-jsx - Import and transpile JSX on the fly.
webreflection/promise - Abortable and Resolvable Promises.
Tiny LRU - Least Recently Used cache for Client or Server.
Exif.js - JavaScript library for reading EXIF image metadata.
Textify - Simple scroll based text reveal animation library.
txt-shuffle - Customisable text shuffling animations.
json-logic-js - Build complex rules, serialize them as JSON, and execute them in JavaScript.
Textbox - Library to layout text for display on SVG or Canvas.
highlightjs-copy - Simple, accessible highlightjs plugin to add a copy button to your code blocks.
Licia - Useful utility collection with zero dependencies.
algovivo - JavaScript + WASM implementation of an energy-based formulation for soft-bodied virtual creatures.
PlaceKit Autocomplete JS Library
open - Open stuff like URLs, files, executables. Cross-platform.
dot-prop - Get, set, or delete a property from a nested object using a dot path.
headless-qr - Simple, modern QR code library.
humanize-url - Humanize a URL.
Aimless.js - Missing JavaScript randomness library.
mitata - Cross-runtime benchmarking lib and CLI.
tz-lookup - JavaScript Library for Timezone Lookup by Location.
bole - Tiny JSON logger, optimized for speed and simplicity.
Restructure - Declaratively encode and decode binary data.
qrcode-svg - Simple QR Code generator.
Driver.js - Light-weight, no-dependency, vanilla JavaScript engine to drive the user's focus across the page.
PicoLRU - Tiny LRU implementation that strives for simplicity and performance.
Microfuzz - Tiny, simple, fast JS fuzzy search library.
JSON Schema Form - Headless UI form library powered by JSON Schemas.
Base65536 - Binary encoding optimised for UTF-32-encoded text.
webreflection/fs - Emscripten FS, PATH and PATH_FS utilities as a module.
base-x - Encode/decode any base.
EasyDropzoneJS - Library for drag&drop files. (HN)
pretty-bytes - Convert bytes to a human readable string: 1337 → 1.34 kB.
devlop - Tools to make developing easier while not including code in production.
fast-memoize - Fastest possible memoization library.
cached-factory - Creates and caches values under keys.
Peaks.js - JavaScript UI component for interacting with audio waveforms.

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