JSPM

HTML5 `FormData` for Browsers and Node.

High performance (de)compression in an 8kB package

Universal WHATWG Fetch API for Node, Browsers and React Native

Check which JavaScript environment your code is running in at runtime: browser, Node.js, Bun, etc

Get the bundle identifier of the default browser (macOS). Example: com.apple.Safari

Microsoft Azure SDK for JavaScript - Aborter

the path module from node core for browsers

A simple, lightweight JavaScript API for handling cookies

JavaScript's functional programming helper library.

Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent & Client Hints data. Supports browser & node.js environment

the stream module from node core for browsers

Parse milliseconds into an object

OpenTelemetry Collector Trace Exporter allows user to send collected traces to the OpenTelemetry Collector

Minimal lightweight logging for JavaScript, adding reliable log level methods to any available console.log methods

Convert a typed array to a Buffer without a copy

atob for Node.JS and Linux / Mac / Windows CLI (it's a one-liner)

Parse and stringify URL query strings

JavaScript library for DOM operations

Better `os.arch()` for node and the browser -- detect OS architecture

OpenTelemetry Collector Logs Exporter allows user to send collected logs to the OpenTelemetry Collector

Compare semver version strings to find greater, equal or lesser.

Microsoft Azure SDK for JavaScript - Logger

Get a KeyboardEvent.key-style string from an event

A better opn. Reuse the same tab on Chrome for 👨‍💻.

Random number generator for browsers and node.js

The assert module from Node.js, for the browser.

An alias package for `crypto.randomBytes` in Node.js and/or browsers

Decode JWT tokens, mostly useful for browser applications.

Isomorphic implementation of WebSocket

OpenTelemetry Collector Metrics Exporter allows user to send collected metrics to the OpenTelemetry Collector

OpenTelemetry Zipkin Exporter allows the user to send collected traces to Zipkin.

JSON without touching any globals

JavaScript SVG parser and renderer on Canvas.

Node's domain module for the web browser. This is merely an evented try...catch with the same API as node, nothing more.

A polyfill for the Resize Observer API

Apple's property list parser/builder for Node.js and browsers

node's constants module for the browser

Copy stuff into clipboard using JS with fallbacks

https module compatability for browserify

LRU and FIFO caches for Client or Server

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.

Toggle current selected content in browser

vm module for the browser

Converts a Web-API readable-stream into a Node.js readable-stream.

the tty module from node core for browsers

Microsoft Azure Storage SDK for JavaScript - Blob

timers module for browserify

🔥 An extremely fast and efficient LRU cache for JavaScript with high compatibility (including Browsers).

Isomorphic client library for supporting long-running operations in node.js and browser.

Promisify an event by waiting for it to be emitted

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

Low-Level OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

Framework-agnostic, micro-library for getting stack traces in all environments

btoa for Node.JS (it's a one-liner)

Tiny and elegant HTTP client based on the Fetch API

Cypress is a next generation front end testing tool built for the modern web

Isomorphic WebSocket

resolve which handles browser field support in package.json

Lazy assertions without performance penalty

Browser running for Vitest

Check if a value is a natural number

A JavaScript library to zip and unzip files in the browser, Deno and Node.js

A package that contains an array of every single file extension there is for text files

File manager plugin for CKEditor 5

Cross-browser `CustomEvent` constructor

Simple wrapper for cross-browser usage of the JavaScript Fullscreen API, which lets you bring the page or any element into fullscreen.

Lightweight and performant natural sorting of arrays and collections by differentiating between unicode characters, numbers, dates, etc.

HKDF with no dependencies using runtime's native crypto

Flmngr file manager (Local disk / Amazon S3 / Azure Blob)

Plugin for loglevel message prefixing

A tiny (230B) and fast UUID (v4) generator for Node and the browser

Check in which environment the code is running - browser/node.js/webworker/jsdom/deno

A package that contains an array of every single file extension there is for binary files

Image structural similarity (SSIM). In TypeScript/JavaScript. For browser/server.

Browser running for Vitest using playwright

(recursive)? merging of (cloned)? objects.

DOMParser.parseFromString for XML with IE8 fallback

Dynamic script loading for browser

Provides access to the system's web browser and supports handling redirects. On iOS, it uses SFSafariViewController or ASWebAuthenticationSession, depending on the method you call, and on Android it uses ChromeCustomTabs. As of iOS 11, SFSafariViewControl

React's ExecutionEnvironment module extracted for use in other packages & components

Determine if a filename and/or buffer is text or binary. Smarter detection than the other solutions.

Adds console.table method that prints an array of objects as a table in console

Serializes any DOM node into a String

A tool to get browser's scrollbars width.

RSA library for Node.js and browsers

Isomorphic client library for Azure KeyVault's keys.

Topological sort of directed acyclic graphs (like dependecy lists)

Mouse wheel normalization across multiple multiple browsers.

OpenTelemetry instrumentation for fetch http client in web browsers

Library to work against complex domain names, subdomains and URIs. Only contains ICANN section.

Tiny local JSON database for Node, Electron and the browser

Unpack a browser type and version from the useragent string

Get the paths of edge browser easily

Check if mobile browser.

Browser compatibility data provided by MDN Web Docs

Check whether operating system CPU architecture is 64-bit or 32-bit (Supports browsers)

Smallest/simplest possible means of using btoa with both Node and browserify

Detect device type and render your component according to it

Logger Utils

Check version ranges like `>=N` and `X || Y || Z` with support for Node.js, Web Browsers, Deno, and TypeScript.

Analyze and debug space usage through source maps

JavaScript API to work against complex domain names, subdomains and URIs.

A fast, lightweight LRU (Least Recently Used) cache for JavaScript with O(1) operations and optional TTL support.

Tests if ES6 Symbol is supported.

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

Tests if ES6 @@toStringTag is supported.

Cross Platform implementation of the GitLab API

browser-side require() the node way

Azure Key Vault Secrets

Promptbook: Create persistent AI agents that turn your company's scattered knowledge into action

provides locking mechanism to sync across browser tabs

A Minimalistic Wrapper for IndexedDB

Creates an async iterator for a variety of inputs in the browser and node. Supports fetch, node-fetch, and cross-fetch

Extends Chai with assertions about promises.

XMLHttpRequest emulation for node.js

Simple JS stack with auto run for node and browsers

Node standard library for browser.

Browser port of the Node.js 'request' package

Browser fingerprinting library with the highest accuracy and stability

Minimal JavaScript module loader

Compress images in the browser

pack node-style source files from a json stream into a browser bundle

walk the dependency graph to generate json output that can be fed into browser-pack

Chromium Binary for Serverless Platforms

Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent data. Supports browser & node.js environment

sort module-deps output for deterministic browserify bundles

A function to get the scrolling parent of an html element.

Create a MD5 hash with hex encoding

support for asynchronous development with a Promise based task Scheduler, several different Promise implementations (synchronous, idle, asynchronous and native runtime wrappers), await helpers, and aliases all built and tested using TypeScript.

Light-weight EventEmitter (less than 1KB when gzipped)

Extends Chai with assertions for the Sinon.JS mocking framework.

Test whether value is error object

Environment utilities

The official Fullstory browser SDK

Node's path builtin module exposed as dual ESM/CJS and browser-compatible out of the box.

Javascript audio library for the modern web.

Lint browser compatibility of API used

Render React components in Vitest Browser Mode

Detect default web browser of the current user, cross-platform (Win/Lin/Mac)

Super light and fast Extensible ES6+ events and EventEmitters for Node and the browser. Easy for any developer level, use the same exact code in node and the browser. No frills, just high speed events!

Simple JS queue with auto run for node and browsers

Array#filter for older browsers.

Comprehensive TypeScript/JavaScript utility library with cross-environment support (Node.js, browser, web worker) providing helper functions, polyfills (ES5-ES2023), type checking utilities, and optimized implementations for better minification and code r

AWS X-Ray ID generator for OpenTelemetry

An extended Error class that envelops a parent error, such that the stack trace contains the causation

tap-producing test harness for node and browsers

The speed of a single-page web application without having to write any JavaScript

Fastest, most accurate & effecient user agent string parser, uses Browserscope's research for parsing

the part of vue-inbrowser-compiler-utils that contains no vue dependency

Open a URL via the operating system (http: in default browser, mailto: in mail client etc.

A client for working with the BrowserStack APIs.

Give your JS App some Backbone with Models, Views, Collections, and Events.

Lightweight copy to clipboard for the web

Isomorphic implementation of WebSocket

Google's libphonenumber pre-compiled with the closure compiler

Oboe.js reads json, giving you the objects as they are found without waiting for the stream to finish

An AI web browsing framework focused on simplicity and extensibility.

Copy text to the clipboard in modern browsers (0.2 kB)

Lightning fast hash functions for browsers and Node.js using hand-tuned WebAssembly binaries (MD4, MD5, SHA-1, SHA-2, SHA-3, Keccak, BLAKE2, BLAKE3, PBKDF2, Argon2, bcrypt, scrypt, Adler-32, CRC32, CRC32C, RIPEMD-160, HMAC, xxHash, SM3, Whirlpool)

Strictly typed EventTarget that directly extends EventTarget to function as a drop-in replacement. It works with all Event-Types and accounts for basically no additional bundle-size.

A pure JavaScript client for the tus resumable upload protocol

Small module for fitting a canvas element within the bounds of its parent.

Copy to clipboard.

Read `.xlsx` files in a web browser or in Node.js

Browser automation CLI for AI agents

A generated SDK for ResourceManagementClient.

A generated SDK for WebSiteManagementClient.

Manage unstructured data using DataSet. Add, update, and remove data, and listen for changes in the data.

Emscripten distribution of libheif for Node.JS and the browser

Lint CSS for browser support against caniuse database

Morph a DOM tree to another DOM tree (no virtual DOM needed)

Modern Jira REST API client for JavaScript and TypeScript. Full-featured library for Jira Cloud API v2/v3, Jira Agile API, and Jira Service Desk API. Works in Node.js and browsers with TypeScript support, tree-shaking, and comprehensive type definitions.

Populate a <canvas> element with a font texture atlas

Pure JavaScript crypto implementation using noble-hashes for otplib

Faro web tracing implementation.

Faro instrumentations, metas, transports for web.

JavaScript barcode generator supporting over 100 types and standards.

Smallest/simplest possible means of using atob with both Node and browserify

Check if browser is Firefox

A cross-browser wrapper for the Web Audio API which aims to closely follow the standard.

Consistent cross browser mouse wheel movement

`[].map(f)` for older browsers

A javascript scrollbar plugin that hides the native scrollbars, provides custom styleable overlay scrollbars, and preserves the native functionality and feel.

Javascript string formatter for human readability

A dynamic, browser-based visualization library.

Generates lorem ipsum placeholder text for Node.js, Deno, browsers, and React Native. Developed with Bun.

Detect default web browser of the current user, cross-platform (Win/Lin/Mac)

Automatically opens your browser and iOS Simulator to preview Node.js email messages sent with Nodemailer. Made for Forward Email and Lad. Cross-browser and cross-platform email testing.

watch mode for browserify builds

OpenFeature SDK for Web

It is a lightweight rest client for node.js and the browser

Get the size of an element in pixels, including margins

AAC encoder extension for Mediabunny, based on FFmpeg.

Implementation of the Server-sent events protocol for Node.js and browsers.

Cross platform environment variables with process.env, window.name, location.hash and localStorage fallbacks

Browser polyfill for Node.js diagnostics_channel

Disallow features that are unsupported by the browsers that you are targeting

Microsoft Azure Storage SDK for JavaScript - Queue

A generated SDK for StorageManagementClient.

Check if browser is Internet Explorer

TaffyDB is an opensouce library that brings database features into your JavaScript applications.

Check if a value is a `Blob`

Fingerprint JavaScript agent

Utility library to determine and normalize Element.scrollLeft behavior

⚡ Next-gen Web Extension Framework

Simple JS queue with auto run for node and browsers

UI utilities

Turn a HTML string into DOM elements, cross-platform

Utilities for working with match patterns.

Extend Chai Assertion library with tests for http apis

An in-memory implementation of webextension-polyfill for testing. Supports all test frameworks (Vitest, Jest, etc)

strings comparison matchers for chai

Normalize browsers' default style

Auto mock all localstorage and sessionstorage APIs for your Jest tests

Tiny hashing module that uses the native crypto API in Node.js and the browser

A robust, strictly-typed Node.js and Browser library for parsing office files (.docx, .pptx, .xlsx, .odt, .odp, .ods, .pdf, .rtf, .csv, .md, .html) and generating high-fidelity outputs in Markdown, HTML, CSV, RTF, and RAG-focused chunks.

launch a web worker that can require() in the browser with browserify

tiny http client for Node and the browser

A generated SDK for SubscriptionClient.

MP3 encoder extension for Mediabunny, based on LAME.

A modern logging library for Node.js and modern browsers that provides log level mapping to the console

Cross browser String#split implementation

small function to append a query string to a URL

FLAC encoder extension for Mediabunny, based on libFLAC.

Mouse wheel normalization across multiple multiple browsers.

An Lz4 implementation for the browser.

Isolate content script UI's styles from the parent page. Supports all browsers (Chrome, Firefox, Safari)

Native Node.js bindings for liblzma (XZ/LZMA2). Streaming, buffer and async APIs with browser support via WebAssembly. zlib-like API, TypeScript-first, prebuilt binaries for Linux/macOS/Windows.

browserify compatible version of the ace editor.

A companion library to openai for Azure OpenAI.

JS Library & ExpressJS user-agent middleware exposing

Easily publish web extensions to their stores

Runs Promises in a pool that limits their concurrency.

Vendor agnostic access to the fullscreen spec api

Utility for mocking XMLHttpRequests in the browser or nodejs.

Azure AI Projects client library.

Event based JavaScript for the browser

get webrtc browser methods unprefixed

The minimal amount of CSS to replicate the GitHub Markdown style

A lightweight TypeScript/JavaScript library for downloading media from social media platforms

Base draggable class

React hooks done right, for browser and SSR.

Node.js Buffer API, for React Native

Advanced HTTP requests in node.js and browsers

Fast client-side asset builder

Bitcoin Cash cashaddr address format support for Node.js and web browsers.

Check if the internet connection is up

An isomorphic client library for Azure OpenAI Assistants.

Cascading grid layout library

React component to wrap your application or component in an iFrame for encapsulation purposes