JSPM

High performance (de)compression in an 8kB package

Official Coralogix SDK for browsers

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 logs API for OpenTelemetry

Public API for OpenTelemetry

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

Small timing library

watch mode for browserify builds

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.

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

Javascript audio library for the modern web.

The string_decoder module from Node core

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

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.

Node.js Buffer API, for the browser

Array#isArray for older browsers

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

Isomorphic Performance API for Node, Browser & React Native

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

ES2015 `Object.assign()` ponyfill

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

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

Faro instrumentations, metas, transports for web.

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

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

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

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

Chai plugin for JSON Schema v4

Base class for node which OpenTelemetry instrumentation modules extend

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.

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

Lightweight browser detector

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

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

Microsoft Azure SDK for JavaScript - Aborter

JavaScript's functional programming helper library.

the stream module from node core for browsers

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

the path module from node core for browsers

Make React Faster. Automatically.

JavaScript library for DOM operations

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

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

Get the default browser

A simple, lightweight JavaScript API for handling cookies

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

Turbolinks makes navigating your web application faster

Parse and stringify URL query strings

HTML5 `FormData` for Browsers and Node.

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

https module compatability for browserify

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

Random number generator for browsers and node.js

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

JSON without touching any globals

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

⚡ 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.

Parse milliseconds into an object

Decode JWT tokens, mostly useful for browser applications.

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

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

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

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

the tty module from node core for browsers

vm module for the browser

Isomorphic implementation of WebSocket

A polyfill for the Resize Observer API

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

Microsoft Azure SDK for JavaScript - Logger

timers module for browserify

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

⏱ Collect and measure browser performance metrics

node's constants module for the browser

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

Promisify an event by waiting for it to be emitted

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

Toggle current selected content in 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.

resolve which handles browser field support in package.json

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

Copy stuff into clipboard using JS with fallbacks

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

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

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

Check if a value is a natural number

Microsoft Azure Storage SDK for JavaScript - Blob

Cross-browser `CustomEvent` constructor

Tiny and elegant HTTP client based on the Fetch API

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

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.

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

JavaScript SVG parser and renderer on Canvas.

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

Get a KeyboardEvent.key-style string from an event

Authentication library for the browser environment using Web Crypto API

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

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

A generated SDK for MonitoringClient.

Isomorphic WebSocket

Topological sort of directed acyclic graphs (like dependecy lists)

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

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.

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

Lightweight and modern event delegation in the browser

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

Plugin for loglevel message prefixing

Normalize exceptions/errors

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

LRU and FIFO caches for Client or Server

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

Dynamic script loading for browser

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

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

HKDF with no dependencies using runtime's native crypto

browser-side require() the node way

Properly update an error's message

MCP (Model Context Protocol) server for browser tools integration

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

Serializes any DOM node into a String

DOMParser.parseFromString for XML with IE8 fallback

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

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

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

A tool to get browser's scrollbars width.

Tests if ES6 Symbol is supported.

Simple JS stack with auto run for node and browsers

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

Tests if ES6 @@toStringTag is supported.

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

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

High performance Zstandard (de)compression

Isomorphic client library for Azure KeyVault's keys.

Client-side performance monitoring and aggregation.

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

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

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

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

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

Extends Chai with assertions about promises.

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

sort module-deps output for deterministic browserify bundles

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

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

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

A generated SDK for WebSiteManagementClient.

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

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

Browser compatibility data provided by MDN Web Docs

Array#filter for older browsers.

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!

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

Get the paths of edge browser easily

Detect device type and render your component according to it

XMLHttpRequest emulation for node.js

Analyze and debug space usage through source maps

Simple JS queue with auto run for node and browsers

Node standard library for browser.

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

Create a MD5 hash with hex encoding

Unpack a browser type and version from the useragent string

A client for working with the BrowserStack APIs.

Mouse wheel normalization across multiple multiple browsers.

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

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

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

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

Cross Platform implementation of the GitLab API

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

Check if mobile browser.

OpenTelemetry instrumentation for fetch http client in web browsers

File manager plugin for CKEditor 5

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

A generated SDK for ResourceManagementClient.

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

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

Tiny local JSON database for Node, Electron and the browser

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

Minimal JavaScript module loader

A Minimalistic Wrapper for IndexedDB

Simple JS queue with auto run for node and browsers

Isomorphic client library for Azure KeyVault's secrets.

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

Lint browser compatibility of API used

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

Browser fingerprinting library with the highest accuracy and stability

The official Fullstory browser SDK

Browser port of the Node.js 'request' package

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

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

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

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

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

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

Logger Utils

Google's libphonenumber pre-compiled with the closure compiler

Test whether value is error object

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

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

Environment utilities

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

Lightweight copy to clipboard for the web

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

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

Compress images in the browser

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

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

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

strings comparison matchers for chai

Normalize browsers' default style

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

provides locking mechanism to sync across browser tabs

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

Lint CSS for browser support against caniuse database

Azure AI Agents client library.

A pure JavaScript client for the tus resumable upload protocol

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

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

Auto mock all localstorage and sessionstorage APIs for your Jest tests

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)

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

UI utilities

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.

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

Microsoft Azure Storage SDK for JavaScript - Queue

Populate a <canvas> element with a font texture atlas

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

Chromium Binary for Serverless Platforms

<!-- markdownlint-disable MD024 -->

Cascading grid layout library

AWS X-Ray ID generator for OpenTelemetry

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

Check if browser is Internet Explorer