JSPM

Official Coralogix SDK for browsers

High performance (de)compression in an 8kB package

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.

An extremely fast, React-like JavaScript library for building modern user interfaces

A high-performance, lightweight LRU cache. Built for developers who need fast caching without compromising on features.

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

MCP (Model Context Protocol) server for browser tools integration

Library to work against complex domain names, subdomains and URIs.

Lazy assertions without performance penalty

Convert a typed array to a Buffer without a copy

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

Public API for OpenTelemetry

Public logs API for OpenTelemetry

A browser tools server for capturing and managing browser events, logs, and screenshots

watch mode for browserify builds

Small timing library

Fast & effecient user agent string parser. Uses uap-core (Browserscope) data for parsing. Drop-in replacement for useragent

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.

The string_decoder module from Node core

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.

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

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

Generate loader for loading browser polyfills based on feature detection

Determine if an object is a Buffer

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

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

Chai plugin for JSON Schema v4

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

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

Universal WHATWG Fetch API for Node, Browsers and React Native

Base class for node which OpenTelemetry instrumentation modules extend

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

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

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

the path module from node core for browsers

Make React Faster. Automatically.

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.

Lightweight browser detector

A simple, lightweight JavaScript API for handling cookies

Microsoft Azure SDK for JavaScript - Aborter

JavaScript library for DOM operations

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

HTML5 `FormData` for Browsers and Node.

Parse and stringify URL query strings

the stream module from node core for browsers

Random number generator for browsers and node.js

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

⚡ 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.

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

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

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

Client-side performance monitoring and aggregation.

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

Decode JWT tokens, mostly useful for browser applications.

https module compatability for browserify

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

Parse milliseconds into an object

JSON without touching any globals

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

Isomorphic implementation of WebSocket

Microsoft Azure SDK for JavaScript - Logger

timers module for browserify

the tty module from node core for browsers

⏱ 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.

vm module for the browser

node's constants module for the browser

A polyfill for the Resize Observer API

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

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

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

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

Toggle current selected content in browser

resolve which handles browser field support in package.json

Promisify an event by waiting for it to be emitted

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

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

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

JavaScript SVG parser and renderer on Canvas.

Get a KeyboardEvent.key-style string from an event

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

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

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

Microsoft Azure Storage SDK for JavaScript - Blob

Tiny and elegant HTTP client based on the Fetch API

Check if a value is a natural number

Cross-browser `CustomEvent` constructor

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

Authentication library for the browser environment using Web Crypto API

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.

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

Isomorphic WebSocket

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

Normalize exceptions/errors

LRU and FIFO caches for Client or Server

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

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

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

Topological sort of directed acyclic graphs (like dependecy lists)

Dynamic script loading for browser

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

Serializes any DOM node into a String

browser-side require() the node way

Properly update an error's message

Lightweight and modern event delegation in the browser

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

MCP (Model Context Protocol) server for browser tools integration

HKDF with no dependencies using runtime's native crypto

Plugin for loglevel message prefixing

DOMParser.parseFromString for XML with IE8 fallback

A tool to get browser's scrollbars width.

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

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

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

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

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

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

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)

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

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

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

Extends Chai with assertions about promises.

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

sort module-deps output for deterministic browserify bundles

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

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

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

High performance Zstandard (de)compression

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

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

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

A generated SDK for WebSiteManagementClient.

Get the paths of edge browser easily

Detect device type and render your component according to it

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

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

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

Simple JS stack with auto run for node and browsers

XMLHttpRequest emulation for node.js

Array#filter for older browsers.

Unpack a browser type and version from the useragent string

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

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

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!

Browser compatibility data provided by MDN Web Docs

A generated SDK for MonitoringClient.

Node standard library for browser.

tap-producing test harness for node and browsers

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

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

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

Check if mobile browser.

A generated SDK for ResourceManagementClient.

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

Minimal JavaScript module loader

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

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

Create a MD5 hash with hex encoding

File manager plugin for CKEditor 5

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

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

Tiny local JSON database for Node, Electron and the browser

A client for working with the BrowserStack APIs.

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

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

Mouse wheel normalization across multiple multiple browsers.

Isomorphic client library for Azure KeyVault's secrets.

Lint browser compatibility of API used

Cross Platform implementation of the GitLab API

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

A Minimalistic Wrapper for IndexedDB

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

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

Browser port of the Node.js 'request' package

Browser fingerprinting library with the highest accuracy and stability

Test whether value is error object

The official Fullstory browser SDK

Simple JS queue with auto run for node and browsers

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

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

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

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

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

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

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

Environment utilities

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.

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

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

strings comparison matchers for chai

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

Logger Utils

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

Lightweight copy to clipboard for the web

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)

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

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

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

Lint CSS for browser support against caniuse database

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.

Azure AI Agents client library.

A pure JavaScript client for the tus resumable upload protocol

Compress images in the browser

UI utilities

Normalize browsers' default style

provides locking mechanism to sync across browser tabs

Microsoft Azure Storage SDK for JavaScript - Queue

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

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

AWS X-Ray ID generator for OpenTelemetry

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

Check if browser is Internet Explorer

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

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

Populate a <canvas> element with a font texture atlas

Auto mock all localstorage and sessionstorage APIs for your Jest tests

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

Chromium Binary for Serverless Platforms

<!-- markdownlint-disable MD024 -->

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