JSPM

Javascript audio library for the modern web.

OpenCensus Web types is a slightly-patched copy of the `types.ts` files from `@opencensus/core` so that they can be easily imported in web-specific packages.

Array#isArray for older browsers

Isomorphic Performance API for Node, Browser & React Native

Browser-friendly inheritance fully compatible with standard node.js inherits()

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

Node.js Buffer API, for the browser

Converts a source-map from/to different formats and allows adding/changing properties.

A comprehensive JavaScript/TypeScript library designed for both Node.JS and browsers, facilitating seamless interaction with the Atlassian Jira API.

ES2015 `Object.assign()` ponyfill

Faro instrumentations, metas, transports for web.

A modern logging & debugging utility. For browser & server.

The Node.js `util.deprecate()` function with browser support

Open stuff like URLs, files, executables. Cross-platform.

Determine if an object is a Buffer

Generate loader for loading browser polyfills based on feature detection

Chai plugin for JSON Schema v4

OpenTelemetry Core provides constants and utilities shared by all OpenTelemetry SDK packages.

A library for parsing IPv4 and IPv6 IP addresses in node and the browser.

An ES2015 mostly-spec-compliant `Reflect.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible

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

Base class for node which OpenTelemetry instrumentation modules extend

JavaScript's functional programming helper library.

A single, throttle built-in solution to subscribe to browser UI Events.

Universal WHATWG Fetch API for Node, Browsers and React Native

the path module from node core for browsers

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

JWA, JWS, JWE, JWT, JWK, JWKS for Node.js, Browser, Cloudflare Workers, Deno, Bun, and other Web-interoperable runtimes

sitespeed.io is an open-source tool for comprehensive web performance analysis, enabling you to test, monitor, and optimize your website’s speed using real browsers in various environments.

Make React Faster. Automatically.

Microsoft Azure SDK for JavaScript - Aborter

Lightweight browser detector

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

JavaScript library for DOM operations

the stream module from node core for browsers

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

Parse and stringify URL query strings

A simple, lightweight JavaScript API for handling cookies

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

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

Get the default browser

Turbolinks makes navigating your web application faster

HTML5 `FormData` for Browsers and Node.

Client-side performance monitoring and aggregation.

Random number generator for browsers and node.js

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

Decode JWT tokens, mostly useful for browser applications.

https module compatability for browserify

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

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

Parse milliseconds into an object

JSON without touching any globals

Isomorphic implementation of WebSocket

timers module for browserify

the tty module from node core for browsers

vm module for the browser

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

node's constants module for the browser

⏱ Collect and measure browser performance metrics

A powerful JavaScript SDK for creating and managing teams of AI agents with dependency management, parallel/sequential execution, and memory capabilities.

A polyfill for the Resize Observer API

SAX based evented streaming JSON parser in JavaScript (browser and node)

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

Toggle current selected content in browser

Microsoft Azure SDK for JavaScript - Logger

resolve which handles browser field support in package.json

Promisify an event by waiting for it to be emitted

⚡ The fastest and most lightweight open-source VIN decoding library. Fully offline, TypeScript-first, with comprehensive NHTSA VPIC database integration for Node.js, browsers, and Cloudflare Workers.

Copy stuff into clipboard using JS with fallbacks

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

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

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

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

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

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

A simple api for generating sha1 hashes in node and the browser.

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

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

Get a KeyboardEvent.key-style string from an event

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

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

Microsoft Azure Storage SDK for JavaScript - Blob

Cross-browser `CustomEvent` constructor

Check if a value is a natural number

Tiny and elegant HTTP client based on the Fetch API

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

Check if a value is an `Error` instance

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

JavaScript SVG parser and renderer on Canvas.

Authentication library for the browser environment using Web Crypto API

Isomorphic WebSocket

Professional video buffering analytics & tracking library for monitoring video streaming performance, buffering progress, and user experience in real-time. Perfect for video platforms, e-learning apps, and media analytics.

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

Normalize exceptions/errors

Junter is designed to quickly convert JSON to HTML. Supports powerful functionality for the required conversion.

LRU and FIFO caches for Client or Server

Dynamic script loading for browser

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

🔥 An extremely fast and efficient LRU cache for JavaScript with high compatibility (including Browsers) — 6.8KB.

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

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

Serializes any DOM node into a String

Topological sort of directed acyclic graphs (like dependecy lists)

browser-side require() the node way

Lightweight and modern event delegation in the browser

Properly update an error's message

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

DOMParser.parseFromString for XML with IE8 fallback

HKDF with no dependencies using runtime's native crypto

A tool to get browser's scrollbars width.

Plugin for loglevel message prefixing

Universal (Browser & Node) JavaScript error notifier for Honeybadger.io

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

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

AceBase realtime database. Open source firebase alternative for nodejs and browser, with additional features: indexes, geo, fulltext, queries, custom storage, offline usage, synchronization, live data proxies and more

MCP (Model Context Protocol) server for browser tools integration

Tests if ES6 @@toStringTag is supported.

Tests if ES6 Symbol is supported.

Isomorphic client library for Azure KeyVault's keys.

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

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

Extends Chai with assertions about promises.

A small library for generalized transformation of data. This provides a bunch of transformation functions that can be applied to any data structure. It is a direct port of Clojure's [transducers](http://blog.cognitect.com/blog/2014/8/6/transducers-are-com

sort module-deps output for deterministic browserify bundles

Package for encoding / decoding images, transforming images, applying filters, drawing primitives on images on the client side (no need for server Node.js)

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

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

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

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

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

A generated SDK for WebSiteManagementClient.

High performance Zstandard (de)compression

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

An open source JavaScript Gantt chart that helps you illustrate a project schedule in a nice-looking chart.

Array#filter for older browsers.

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

Open source, fullstack monitoring. Capture frontend errors, record server side logs, and visualize what broke with session replay.

XMLHttpRequest emulation for node.js

Junter is designed to quickly convert JSON to HTML. Supports powerful functionality for the required conversion.

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

Simple JS stack with auto run for node and browsers

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

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

Unpack a browser type and version from the useragent string

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

Browser compatibility data provided by MDN Web Docs

Node standard library for browser.

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!

tap-producing test harness for node and browsers

A generated SDK for MonitoringClient.

Get the paths of edge browser easily

Detect device type and render your component according to it

Analyze and debug space usage through source maps

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

OpenTelemetry instrumentation for fetch http client in web browsers

Advanced frontend performance monitoring for web applications - DOM event tracking, component lifecycle profiling, bundle analysis, memory leak detection, and real-time user interaction monitoring.

A generated SDK for ResourceManagementClient.

Check if mobile browser.

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

Create a MD5 hash with hex encoding

Minimal JavaScript module loader

HMAC-based (HOTP) and Time-based (TOTP) One-Time Password library

A client for working with the BrowserStack APIs.

Clamps (ie. cuts off) an HTML element's content by adding ellipsis to it if the content inside is too long.

File manager plugin for CKEditor 5

WASM based, asynchronous Brotli compression and decompression package that works in browsers and Node.js; CommonJS and ESM

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

Isomorphic client Runtime for Typescript/node.js/browser javascript client libraries generated using AutoRest

Cross Platform implementation of the GitLab API

Tiny local JSON database for Node, Electron and the browser

Mouse wheel normalization across multiple multiple browsers.

A lightweight utility for monitoring JavaScript event loop lag in real-time

A Minimalistic Wrapper for IndexedDB

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

Browser port of the Node.js 'request' package

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

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

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

Test whether value is error object

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

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

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

XyPriss is a lightweight, TypeScript-first, open-source Node.js web framework crafted for developers seeking a familiar Express-like API without Express dependencies. It features built-in security middleware, a robust routing system, and performance optim

Promptbook: Run AI apps in plain human language across multiple models and platforms

Lint browser compatibility of API used

Isomorphic client library for Azure KeyVault's secrets.

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

Simple JS queue with auto run for node and browsers

Simple JS queue with auto run for node and browsers

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

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

Browser fingerprinting library with the highest accuracy and stability

The official Fullstory browser SDK

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

strings comparison matchers for chai

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

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

Google's libphonenumber pre-compiled with the closure compiler

Environment utilities

Lightweight copy to clipboard for the web

Logger Utils

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

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)

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

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

Compress images in the browser

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

A pure JavaScript client for the tus resumable upload protocol

Lint CSS for browser support against caniuse database

Azure AI Agents client library.

Normalize browsers' default style

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

Microsoft Azure Storage SDK for JavaScript - Queue

Isomorphic/Universal WHATWG URL API with some support legacy node URL API

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

provides locking mechanism to sync across browser tabs

AWS X-Ray ID generator for OpenTelemetry

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

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.

Non-dom-event way to catch DOM insertions. Works in IE10+ and filters by selectors.

Auto mock all localstorage and sessionstorage APIs for your Jest tests

Chromium Binary for Serverless Platforms

Downgrade content-security-policy version and fidelity to support the requesting browser

UI utilities

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

Populate a <canvas> element with a font texture atlas

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

Extend Chai Assertion library with tests for http apis

small function to append a query string to a URL

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

browserify compatible version of the ace editor.

<!-- markdownlint-disable MD024 -->

Check if a value is a `Blob`

Consistent cross browser mouse wheel movement

Get the size of an element in pixels, including margins

Check if browser is Firefox

Test'em 'scripts! Javascript Unit testing made easy.

Check if browser is Internet Explorer

tiny http client for Node and the browser

Cascading grid layout library

JavaScript barcode generator supporting over 100 types and standards.

Read small to medium `*.xlsx` files in a browser or Node.js. Parse to JSON with a strict schema.

Mouse wheel normalization across multiple multiple browsers.

Automated browser testing for the modern web development stack.

Advanced HTTP requests in node.js and browsers

Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)

A companion library to openai for Azure OpenAI.

Universal Logger Library for every environment: React, React Native, Vue, Angular, Node.js, Browser

A jQuery plugin that adds cross-browser mouse wheel support.