JSPM

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

JavaScript library for DOM operations

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

A simple, lightweight JavaScript API for handling cookies

Get the default browser

the stream module from node core for browsers

HTML5 `FormData` for Browsers and Node.

Parse and stringify URL query strings

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

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

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

Random number generator for browsers and node.js

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

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

Decode JWT tokens, mostly useful for browser applications.

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

https module compatability for browserify

Parse milliseconds into an object

JSON without touching any globals

Isomorphic implementation of WebSocket

the tty module from node core for browsers

vm module for the browser

node's constants module for the browser

timers module for browserify

Microsoft Azure SDK for JavaScript - Logger

A polyfill for the Resize Observer API

Web monitoring package for monitor system

resolve which handles browser field support in package.json

Lazy assertions without performance penalty

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

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

Toggle current selected content in browser

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

A SDK For Monitoring Browser Errors

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

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

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

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.

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

Check if a value is an `Error` instance

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

JavaScript SVG parser and renderer on Canvas.

Microsoft Azure Storage SDK for JavaScript - Blob

Check if a value is a natural number

Tiny and elegant HTTP client based on the Fetch API

Cross-browser `CustomEvent` constructor

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

Dynamic script loading for browser

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

browser-side require() the node way

Isomorphic WebSocket

Normalize exceptions/errors

DOMParser.parseFromString for XML with IE8 fallback

LRU and FIFO caches for Client or Server

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

Topological sort of directed acyclic graphs (like dependecy lists)

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

Plugin for loglevel message prefixing

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

Properly update an error's message

Serializes any DOM node into a String

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

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

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

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

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

HKDF with no dependencies using runtime's native crypto

A tool to get browser's scrollbars width.

sort module-deps output for deterministic browserify bundles

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

Tests if ES6 Symbol is supported.

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

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

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

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

Tests if ES6 @@toStringTag is supported.

A generated SDK for WebSiteManagementClient.

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

Isomorphic client library for Azure KeyVault's keys.

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

Extends Chai with assertions about promises.

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

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

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

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

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

Simple JS stack with auto run for node and browsers

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

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

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

tap-producing test harness for node and browsers

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

Detect device type and render your component according to it

OpenTelemetry instrumentation for fetch http client in web browsers

Array#filter for older browsers.

Get the paths of edge browser easily

XMLHttpRequest emulation for node.js

Unpack a browser type and version from the useragent string

Check if mobile browser.

File manager plugin for CKEditor 5

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!

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

Node standard library for browser.

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

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

Create a MD5 hash with hex encoding

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

Analyze and debug space usage through source maps

A Minimalistic Wrapper for IndexedDB

A generated SDK for ResourceManagementClient.

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

Tiny local JSON database for Node, Electron and the browser

Minimal JavaScript module loader

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

Simple JS queue with auto run for node and browsers

A client for working with the BrowserStack APIs.

Mouse wheel normalization across multiple multiple browsers.

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

Cross Platform implementation of the GitLab API

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

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

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

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

Lint browser compatibility of API used

Isomorphic client library for Azure KeyVault's secrets.

Browser port of the Node.js 'request' package

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

Simple JS queue with auto run for node and browsers

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

Test whether value is error object

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

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

Javascript audio library for the modern web.

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

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

The official Fullstory browser SDK

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

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.

Environment utilities

Logger Utils

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

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

strings comparison matchers for chai

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

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

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

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

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

Lightweight copy to clipboard for the web

Microsoft Azure Storage SDK for JavaScript - Queue

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)

AWS X-Ray ID generator for OpenTelemetry

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

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

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

Lint CSS for browser support against caniuse database

Compress images in the browser

A pure JavaScript client for the tus resumable upload protocol

Normalize browsers' default style

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.

UI utilities

Auto mock all localstorage and sessionstorage APIs for your Jest tests

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

provides locking mechanism to sync across browser tabs

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

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

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

Chromium Binary for Serverless Platforms

Faro instrumentations, metas, transports for web.

Chai plugin for JSON Schema v4

Extend Chai Assertion library with tests for http apis

Populate a <canvas> element with a font texture atlas

Check if browser is Internet Explorer

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

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.

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

<!-- markdownlint-disable MD024 -->

small function to append a query string to a URL

A companion library to openai for Azure OpenAI.

Cascading grid layout library

Check if a value is a `Blob`

browserify compatible version of the ace editor.

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

Consistent cross browser mouse wheel movement

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

tiny http client for Node and the browser

Generic browser priority queue.

Get the size of an element in pixels, including margins

Check if browser is Firefox

memlab browser E2E interaction libraries

Emscripten distribution of libheif for Node.JS and the browser

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

Mouse wheel normalization across multiple multiple browsers.

Advanced HTTP requests in node.js and browsers

Auth0 headless browser sdk

Capture browser logs for logging in NodeJS

Automated browser testing for the modern web development stack.

Faro web tracing implementation.

Javascript string formatter for human readability

ExpressJS/Connect/TrinteJS user-agent middleware exposing

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

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

Returns `true` if the Selection is "backward", `false` otherwise

Javascript SDK for MetaStats forex trading statistics API. Can calculate metrics for MetaTrader accounts added to MetaApi. Supports both MetaTrader 5 (MT5) and MetaTrader 4 (MT4). (https://metaapi.cloud)

insert a string of css into the <head>

A generated SDK for ContainerInstanceManagementClient.

Use Ky in both Node.js and browsers

compute the bounding box of geojson features

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

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

A regular expression that matches a CHANGELOG filename

Render React components in Vitest Browser Mode

AngularJS mocks for testing

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

Base draggable class

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

Fast client-side asset builder

React hooks done right, for browser and SSR.

Copy to clipboard.

return all coordinates from a geojson object

memlab API

ObserveRTC Client Integration Javascript Library

Fingerprint Pro JavaScript agent

OpenFeature SDK for Web

A generated SDK for StorageManagementClient.

get webrtc browser methods unprefixed

Strictly typed EventTarget that directly extends EventTarget to function as a drop-in replacement. It works with all Event-Types and accounts for basically no additional bundle-size.

A generated SDK for ComputeManagementClient.

launch a web worker that can require() in the browser with browserify

Simple utility for watching and retrieving browser viewport width, height, vmin and vmax

Merge an error with its inner cause

Properly wrap an error's message

Migrate older jQuery code to jQuery 3.0+

Utility library to determine and normalize Element.scrollLeft behavior

Event binding component