JSPM

An AI powered browser automation testing agent powered by LLMs.

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Mocha tests in Electron.

Automated Functional Testing (AFT) package supporting UI testing in browsers with support for BrowserStack, Sauce Labs and Local Selenium Grid

Cypress.io end to end testing tool

Make End-to-End Testing Great for Once

A responsiveness testing tool on browsers

A lightweight wrapper making assertion testing much easier.

expressive server-side functional testing with jQuery and jsdom

A JavaScript testing framework for the real world

The string_decoder module from Node core

Adapter that integrates @serenity-js/web with Protractor, enabling Serenity/JS reporting and using the Screenplay Pattern to write end-to-end test scenarios

Array#isArray for older browsers

Provides a minified version of selected `@sa11y` libraries to be injected into a browser (using webdriver) and executed from integration testing workflows.

Adapter that integrates @serenity-js/web with Playwright, enabling Serenity/JS reporting and using the Screenplay Pattern to write component and end-to-end test scenarios

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

Auto mock all localstorage and sessionstorage APIs for your Jest tests

Node.js Buffer API, for the browser

Event based JavaScript for the browser

Cypress.io end to end testing tool

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

Render Vue components in Vitest Browser Mode

ES2015 `Object.assign()` ponyfill

Modern and minimalist testing library for the web

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

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

Automated browser testing for the modern web development stack.

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

A proper monster for front-end automated testing

Determine if an object is a Buffer

Serenity/JS test runner adapter for Playwright Test, combining Playwright's developer experience with the advanced reporting and automation capabilities of Serenity/JS

All-in-one open source e2e testing framework, with low-code recorder, runner + batteries built-in.

Run TAP unit tests in 1789+ browsers

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

strings comparison matchers for chai

Render Svelte components in Vitest Browser Mode

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

Base class for node which OpenTelemetry instrumentation modules extend

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

Public logs API for OpenTelemetry

Public API for OpenTelemetry

Flood Element is a browser based load generation tool for easily testing modern web application performance

Utilities.

Use Ky in both Node.js and browsers

Universal WHATWG Fetch API for Node, Browsers and React Native

the path module from node core for browsers

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

in memory localStorage polyfill for node.js utilizing ES6 proxies

Microsoft Azure SDK for JavaScript - Aborter

Lightweight browser detector

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

Convert a typed array to a Buffer without a copy

JavaScript's functional programming helper library.

High performance (de)compression in an 8kB package

Media-Mock is a JavaScript library that simulates media devices (like webcams) in web applications, allowing developers to test and debug media constraints, device configurations, and stream functionality without needing physical devices. This is particul

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

A powerful command-line interface for automating Chrome browser using Playwright. Perfect for web scraping, automation, testing, and browser workflows.

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

Parse and stringify URL query strings

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

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

Utility for mocking XMLHttpRequest.

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

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

A simple, lightweight JavaScript API for handling cookies

Get the default browser

Super simple browser testing influenced by testling and smokestack

<!-- markdownlint-disable MD024 -->

Exports a jsdom window object.

HTML5 `FormData` for Browsers and Node.

Decode JWT tokens, mostly useful for browser applications.

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

Parse milliseconds into an object

Random number generator for browsers and node.js

Chai plugin for JSON Schema v4

https module compatability for browserify

node's constants module for the browser

the tty module from node core for browsers

Isomorphic implementation of WebSocket

E2E Testing Reinvented with AI - A powerful TypeScript browser automation framework using AI-powered testing with LangChain, OpenAI GPT-4o, and Playwright

vm module for the browser

JSON without touching any globals

timers module for browserify

A polyfill for the Resize Observer API

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.

Lazy assertions without performance penalty

Collection of samples useful in testing IOTA modules.

Toggle current selected content in browser

Copy stuff into clipboard using JS with fallbacks

Promisify an event by waiting for it to be emitted

Microsoft Azure SDK for JavaScript - Logger

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

Chromium binaries for Node.js projects

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

Evaluate Javascript in PhantomJS, and print the output.

Auto mock all localstorage and sessionstorage APIs for your Vitest tests

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

resolve which handles browser field support in package.json

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

High Level DOM Assertions for QUnit

React Browser Tests is a browser first testing library. The tests are written in React and run in a browser. Terminal also works.

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

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

Get a KeyboardEvent.key-style string from an event

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

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

date / time comparison matchers for chai

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

Check if a value is an `Error` instance

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

Isomorphic WebSocket

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

DOM assertions for the Chai assertion library using vanilla JavaScript

JavaScript SVG parser and renderer on Canvas.

The Backbone Framework

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

Adapter that integrates @serenity-js/web with the latest stable version of WebdriverIO, enabling Serenity/JS reporting and using the Screenplay Pattern to write web and mobile test scenarios

The node.js assert module, re-packaged for web browsers.

Detects where the current browser extension code is being run. Compatible with Firefox, Chrome and derivates.

LRU and FIFO caches for Client or Server

Spies for the Chai assertion library.

Serializes any DOM node into a String

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

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

UMD __dirname and __filename browser shim

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

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

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

Topological sort of directed acyclic graphs (like dependecy lists)

An implementation of https://github.com/emberjs/rfcs/pull/726

Shallow deep equal assertion for chai

HKDF with no dependencies using runtime's native crypto

Dynamic script loading for browser

Plugin for loglevel message prefixing

A tool to get browser's scrollbars width.

browser-side require() the node way

Extends Chai with lint-friendly terminating assertions.

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

Tests if ES6 Symbol is supported.

All-in-one open source e2e testing framework, with low-code recorder, runner + batteries built-in.

DOMParser.parseFromString for XML with IE8 fallback

A framework for mocking the FileMaker webviewer window object for developing and testing fm webviewer apps in browser.

Tests if ES6 @@toStringTag is supported.

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

Isomorphic client library for Azure KeyVault's keys.

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

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

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

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

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

Array#filter for older browsers.

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

sort module-deps output for deterministic browserify bundles

Unpack a browser type and version from the useragent string

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

The simplest unit testing framework possible.

XMLHttpRequest emulation for node.js

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

Simple JS stack with auto run for node and browsers

Smart IPFS gateway selector with latency testing and fallback logic (vanilla JS)

A generated SDK for WebSiteManagementClient.

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

Node standard library for browser.

A browser and nodeJS compatible plugin that allows to generate GraphQL Queries and Variables

Browser compatibility data provided by MDN Web Docs

LambdaTest Rest Client for Node.js

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

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

A mock browser with window, document, location, navigation, local and session storage to use for client side code tests in a node environment.

Simulates a global browser environment using jsdom

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!

Analyze and debug space usage through source maps

A generated SDK for ResourceManagementClient.

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

Detect device type and render your component according to it

Get the paths of edge browser easily

Minimal JavaScript module loader

JavaScript UI component for displaying audio waveforms

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

Tiny local JSON database for Node, Electron and the browser

CSS base styles

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

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

Cross Platform implementation of the GitLab API

OpenTelemetry instrumentation for fetch http client in web browsers

A lightweight, flexible and based testing library for JS

Mouse wheel normalization across multiple multiple browsers.

Browser port of the Node.js 'request' package

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

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

Check if mobile browser.

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

utilities for parsing shorthand Selenium capabilities objects

Test whether value is error object

File manager plugin for CKEditor 5

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

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

A Minimalistic Wrapper for IndexedDB

A simple and small testing suite for javascript, both browser and node.js

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

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

Lint browser compatibility of API used

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

Simple JS queue with auto run for node and browsers

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.

watch mode for browserify builds

Isomorphic client library for Azure KeyVault's secrets.

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

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

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

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

the stream module from node core for browsers

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

Browser fingerprinting library with the highest accuracy and stability

Adapter that integrates @serenity-js/web with WebdriverIO 8, enabling Serenity/JS reporting and using the Screenplay Pattern to write web and mobile test scenarios

Javascript audio library for the modern web.

Simple JS queue with auto run for node and browsers

The official Fullstory browser SDK

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

A promise controlled browser ideal for testing

Run textlint rule on browser for testing.

The #1 HTML sanitizer - 100% security success rate AND fastest performance. Outperforms DOMPurify, js-xss, bleach-js and all competitors in comprehensive testing.

Google's libphonenumber pre-compiled with the closure compiler

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

A powerful browser based unit testing user interface.

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

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

Mixpanel Cordova Plugin for iOS, Android and Browser Platforms

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)

Lightweight copy to clipboard for the web

Logger Utils

Environment utilities

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

Lint CSS for browser support against caniuse database

Fast, generic and type safe router (match method and path).

Compress images in the browser