JSPM

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

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

Determine if an object is a Buffer

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

A lightweight, type-safe localStorage utility with advanced querying, filtering, cross-tab communication, and storage monitoring

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

MCP (Model Context Protocol) server for browser tools integration

Base class for node which OpenTelemetry instrumentation modules extend

JavaScript's functional programming helper library.

Universal WHATWG Fetch API for Node, Browsers and React Native

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

Lightweight browser detector

High performance (de)compression in an 8kB package

A monitoring endpoint for queen

Microsoft Azure SDK for JavaScript - Aborter

Convert a typed array to a Buffer without a copy

JavaScript library for DOM operations

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

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

the stream module from node core for browsers

Parse and stringify URL query strings

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

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

HTML5 `FormData` for Browsers and Node.

Random number generator for browsers and node.js

Decode JWT tokens, mostly useful for browser applications.

https module compatability for browserify

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

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

Parse milliseconds into an object

JSON without touching any globals

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

Isomorphic implementation of WebSocket

timers module for browserify

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

the tty module from node core for browsers

vm module for the browser

node's constants module for the browser

Web monitoring package for monitor system

A polyfill for the Resize Observer API

Lazy assertions without performance penalty

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

Microsoft Azure SDK for JavaScript - Logger

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

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

A SDK For Monitoring Browser Errors

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

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.

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

Get a KeyboardEvent.key-style string from an event

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

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

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.

Check if a value is an `Error` instance

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.

JavaScript SVG parser and renderer on Canvas.

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

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

Isomorphic WebSocket

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

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

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.

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

Next-generation JavaScript logging library with performance tracking, memory monitoring, analytics, and advanced debugging features.

Tests if ES6 Symbol is supported.

Tests if ES6 @@toStringTag 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.

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

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

sort module-deps output for deterministic browserify bundles

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

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

A generated SDK for WebSiteManagementClient.

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

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

Simple JS stack with auto run for node and browsers

Array#filter for older browsers.

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

XMLHttpRequest emulation for node.js

Unpack a browser type and version from the useragent string

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

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

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

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

Browser compatibility data provided by MDN Web Docs

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!

Node standard library for browser.

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

Get the paths of edge browser easily

tap-producing test harness for node and browsers

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

Check if mobile browser.

A generated SDK for ResourceManagementClient.

Minimal JavaScript module loader

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

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

Create a MD5 hash with hex encoding

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

File manager plugin for CKEditor 5

A client for working with the BrowserStack APIs.

Tiny local JSON database for Node, Electron and the browser

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

Mouse wheel normalization across multiple multiple browsers.

Cross Platform implementation of the GitLab API

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

A Minimalistic Wrapper for IndexedDB

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

Browser port of the Node.js 'request' package

Test whether value is error object

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

Simple JS queue with auto run for node and browsers

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

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

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

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

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

Isomorphic client library for Azure KeyVault's secrets.

Lint browser compatibility of API used

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.

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

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

Browser fingerprinting library with the highest accuracy and stability

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

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

The official Fullstory browser SDK

Javascript audio library for the modern web.

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

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

Environment utilities

Logger Utils

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

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

Compress images in the browser

A pure JavaScript client for the tus resumable upload protocol

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)

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

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.

Faro instrumentations, metas, transports for web.

UI utilities

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.

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.

Consistent cross browser mouse wheel movement

Cascading grid layout library

Check if a value is a `Blob`

Get the size of an element in pixels, including margins

Check if browser is Firefox

Check if browser is Internet Explorer

tiny http client for Node and the browser

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

Chai plugin for JSON Schema v4

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

JavaScript barcode generator supporting over 100 types and standards.

Mouse wheel normalization across multiple multiple browsers.

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

Advanced HTTP requests in node.js and browsers

Automated browser testing for the modern web development stack.

A companion library to openai for Azure OpenAI.

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

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

ExpressJS/Connect/TrinteJS user-agent middleware exposing

Faro web tracing implementation.

insert a string of css into the <head>

Generic browser priority queue.

A generated SDK for ContainerInstanceManagementClient.

Device detection (phone, tablet, desktop, mobile grade, os, versions)

memlab browser E2E interaction libraries

A regular expression that matches a CHANGELOG filename

Base draggable class

Emscripten distribution of libheif for Node.JS and the browser

Auth0 headless browser sdk

Capture browser logs for logging in NodeJS

Give eachr an item to iterate (array, object or map) and an iterator, then in return eachr gives iterator the value and key of each item, and will stop if the iterator returned false.

Cross browser String#split implementation

A lightweight library to decode and verify RS JWT meant for the browser.

Javascript string formatter for human readability

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

React hooks done right, for browser and SSR.

Render React components in Vitest Browser Mode

Copy to clipboard.

Fast client-side asset builder

AngularJS mocks for testing

return all coordinates from a geojson object

Use Ky in both Node.js and browsers