JSPM

The string_decoder module from Node core

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

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

Array#isArray for older browsers

Node.js Buffer API, for the browser

ES2015 `Object.assign()` ponyfill

Promise based HTTP client for the browser and node.js

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

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

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

Base class for node which OpenTelemetry instrumentation modules extend

Public logs API for OpenTelemetry

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

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

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

Public API for OpenTelemetry

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

Determine if an object is a Buffer

Lightweight browser detector

Get the default browser

HTML5 `FormData` for Browsers and Node.

High performance (de)compression in an 8kB package

Universal WHATWG Fetch API for Node, Browsers and React Native

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

the path module from node core for browsers

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

A simple, lightweight JavaScript API for handling cookies

Microsoft Azure SDK for JavaScript - Aborter

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

Parse milliseconds into an object

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

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

the stream module from node core for browsers

Convert a typed array to a Buffer without a copy

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

Parse and stringify URL query strings

JavaScript library for DOM operations

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

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

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

Microsoft Azure SDK for JavaScript - Logger

Get a KeyboardEvent.key-style string from an event

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

Random number generator for browsers and node.js

Decode JWT tokens, mostly useful for browser applications.

Isomorphic implementation of WebSocket

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

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

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

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

JSON without touching any globals

JavaScript SVG parser and renderer on Canvas.

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

A polyfill for the Resize Observer API

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

node's constants module for the browser

Copy stuff into clipboard using JS with fallbacks

LRU and FIFO caches for Client or Server

https module compatability for browserify

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.

Toggle current selected content in browser

vm module for the browser

the tty module from node core for browsers

timers module for browserify

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

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

Promisify an event by waiting for it to be emitted

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

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

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

Microsoft Azure Storage SDK for JavaScript - Blob

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

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

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

Tiny and elegant HTTP client based on the Fetch API

Isomorphic WebSocket

resolve which handles browser field support in package.json

Lazy assertions without performance penalty

Browser running for Vitest

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

File manager plugin for CKEditor 5

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

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

Check if a value is a natural number

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

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

Cross-browser `CustomEvent` constructor

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

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

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

Browser running for Vitest using playwright

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

DOMParser.parseFromString for XML with IE8 fallback

Dynamic script loading for browser

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

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

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

A tool to get browser's scrollbars width.

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

Isomorphic client library for Azure KeyVault's keys.

Serializes any DOM node into a String

RSA library for Node.js and browsers

Topological sort of directed acyclic graphs (like dependecy lists)

OpenTelemetry instrumentation for fetch http client in web browsers

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

Tiny local JSON database for Node, Electron and the browser

Unpack a browser type and version from the useragent string

Mouse wheel normalization across multiple multiple browsers.

Check if mobile browser.

Get the paths of edge browser easily

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

Logger Utils

Detect device type and render your component according to it

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

Browser compatibility data provided by MDN Web Docs

A fast, lightweight LRU (Least Recently Used) cache for JavaScript with O(1) operations and optional TTL support.

Tests if ES6 @@toStringTag is supported.

Tests if ES6 Symbol is supported.

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

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

browser-side require() the node way

Azure Key Vault Secrets

Analyze and debug space usage through source maps

JavaScript API to work against complex domain names, subdomains and URIs.

Promptbook: Create persistent AI agents that turn your company's scattered knowledge into action

provides locking mechanism to sync across browser tabs

A Minimalistic Wrapper for IndexedDB

Cross Platform implementation of the GitLab API

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

Extends Chai with assertions about promises.

XMLHttpRequest emulation for node.js

Node standard library for browser.

Browser port of the Node.js 'request' package

Browser fingerprinting library with the highest accuracy and stability

Minimal JavaScript module loader

Simple JS stack with auto run for node and browsers

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

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

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

sort module-deps output for deterministic browserify bundles

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

Compress images in the browser

Create a MD5 hash with hex encoding

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

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

Chromium Binary for Serverless Platforms

Test whether value is error object

Environment utilities

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

The official Fullstory browser SDK

Javascript audio library for the modern web.

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!

Render React components in Vitest Browser Mode

Lint browser compatibility of API used

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

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.

Array#filter for older browsers.

Simple JS queue with auto run for node and browsers

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

AWS X-Ray ID generator for OpenTelemetry

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

tap-producing test harness for node and browsers

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

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

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

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

Isomorphic implementation of WebSocket

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

An AI web browsing framework focused on simplicity and extensibility.

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

A client for working with the BrowserStack APIs.

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)

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 pure JavaScript client for the tus resumable upload protocol

Lightweight copy to clipboard for the web

Google's libphonenumber pre-compiled with the closure compiler

Read `.xlsx` files in a web browser or in Node.js

Copy to clipboard.

Browser automation CLI for AI agents

A generated SDK for ResourceManagementClient.

A generated SDK for WebSiteManagementClient.

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

Emscripten distribution of libheif for Node.JS and the browser

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

Lint CSS for browser support against caniuse database

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

Populate a <canvas> element with a font texture atlas

Pure JavaScript crypto implementation using noble-hashes for otplib

Faro instrumentations, metas, transports for web.

JavaScript barcode generator supporting over 100 types and standards.

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

Check if browser is Firefox

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

Consistent cross browser mouse wheel movement

Modern Jira REST API client for JavaScript and TypeScript. Full-featured library for Jira Cloud API v2/v3, Jira Agile API, and Jira Service Desk API. Works in Node.js and browsers with TypeScript support, tree-shaking, and comprehensive type definitions.

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

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

Faro web tracing implementation.

Javascript string formatter for human readability

A dynamic, browser-based visualization library.

Generates lorem ipsum placeholder text for Node.js, Deno, browsers, and React Native. Developed with Bun.

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.

watch mode for browserify builds

OpenFeature SDK for Web

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

Get the size of an element in pixels, including margins

Implementation of the Server-sent events protocol for Node.js and browsers.

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

Browser polyfill for Node.js diagnostics_channel

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

Microsoft Azure Storage SDK for JavaScript - Queue

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

A generated SDK for StorageManagementClient.

Check if browser is Internet Explorer

Check if a value is a `Blob`

Fingerprint JavaScript agent

AAC encoder extension for Mediabunny, based on FFmpeg.

⚡ Next-gen Web Extension Framework

Utility library to determine and normalize Element.scrollLeft behavior

Simple JS queue with auto run for node and browsers

UI utilities

Turn a HTML string into DOM elements, cross-platform

Utilities for working with match patterns.

Extend Chai Assertion library with tests for http apis

An in-memory implementation of webextension-polyfill for testing. Supports all test frameworks (Vitest, Jest, etc)

strings comparison matchers for chai

Normalize browsers' default style

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

Auto mock all localstorage and sessionstorage APIs for your Jest tests

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

A robust, strictly-typed Node.js and Browser library for parsing office files (.docx, .pptx, .xlsx, .odt, .odp, .ods, .pdf, .rtf, .csv, .md, .html) and generating high-fidelity outputs in Markdown, HTML, CSV, RTF, and RAG-focused chunks.

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

tiny http client for Node and the browser

A generated SDK for SubscriptionClient.

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

MP3 encoder extension for Mediabunny, based on LAME.

Cross browser String#split implementation

small function to append a query string to a URL

Mouse wheel normalization across multiple multiple browsers.

FLAC encoder extension for Mediabunny, based on libFLAC.

An Lz4 implementation for the browser.

Isolate content script UI's styles from the parent page. Supports all browsers (Chrome, Firefox, Safari)

Native Node.js bindings for liblzma (XZ/LZMA2). Streaming, buffer and async APIs with browser support via WebAssembly. zlib-like API, TypeScript-first, prebuilt binaries for Linux/macOS/Windows.

browserify compatible version of the ace editor.

Easily publish web extensions to their stores