JSPM

The string_decoder module from Node core

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

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.

ES2015 `Object.assign()` ponyfill

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

Determine if an object is a Buffer

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

Public logs API for OpenTelemetry

Base class for node which OpenTelemetry instrumentation modules extend

Public API for OpenTelemetry

Universal WHATWG Fetch API for Node, Browsers and React Native

Lightweight browser detector

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

High performance (de)compression in an 8kB package

JavaScript's functional programming helper library.

JavaScript library for DOM operations

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

the stream module from node core for browsers

the path module from node core for browsers

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

Parse and stringify URL query strings

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

Convert a typed array to a Buffer without a copy

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

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

Get the default browser

A simple, lightweight JavaScript API for handling cookies

HTML5 `FormData` for Browsers and Node.

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

Parse milliseconds into an object

Decode JWT tokens, mostly useful for browser applications.

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

the tty module from node core for browsers

vm module for the browser

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

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

Isomorphic implementation of WebSocket

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

Promisify an event by waiting for it to be emitted

Microsoft Azure SDK for JavaScript - Logger

timers module for browserify

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

node's constants module for the browser

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

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.

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

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

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

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

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

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

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.

Isomorphic WebSocket

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

Get a KeyboardEvent.key-style string from an event

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

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

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.

Topological sort of directed acyclic graphs (like dependecy lists)

HKDF with no dependencies using runtime's native crypto

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

Plugin for loglevel message prefixing

LRU and FIFO caches for Client or Server

Dynamic script loading for browser

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

Tests if ES6 Symbol is supported.

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

browser-side require() the node way

Serializes any DOM node into a String

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

DOMParser.parseFromString for XML with IE8 fallback

A tool to get browser's scrollbars width.

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

Simple JS stack with auto run for node and browsers

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

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.

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

Isomorphic client library for Azure KeyVault's keys.

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

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

sort module-deps output for deterministic browserify bundles

Extends Chai with assertions about promises.

Array#filter for older browsers.

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

A generated SDK for WebSiteManagementClient.

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)

Node standard library for browser.

Browser compatibility data provided by MDN Web Docs

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

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

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

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

Unpack a browser type and version from the useragent string

Create a MD5 hash with hex encoding

A client for working with the BrowserStack APIs.

Mouse wheel normalization across multiple multiple browsers.

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

tap-producing test harness for node and browsers

Cross Platform implementation of the GitLab API

Check if mobile browser.

OpenTelemetry instrumentation for fetch http client in web browsers

File manager plugin for CKEditor 5

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

A generated SDK for ResourceManagementClient.

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

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

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

Tiny local JSON database for Node, Electron and the browser

A Minimalistic Wrapper for IndexedDB

Minimal JavaScript module loader

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.

Simple JS queue with auto run for node and browsers

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

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.

Isomorphic client library for Azure KeyVault's secrets.

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

Lint browser compatibility of API used

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

Javascript audio library for the modern web.

Browser fingerprinting library with the highest accuracy and stability

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

Browser port of the Node.js 'request' package

The official Fullstory browser SDK

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

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

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

Test whether value is error object

Logger Utils

Google's libphonenumber pre-compiled with the closure compiler

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

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

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

Environment utilities

Lightweight copy to clipboard for the web

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

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

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

Lint CSS for browser support against caniuse database

Compress images in the browser

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

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

A pure JavaScript client for the tus resumable upload protocol

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

watch mode for browserify builds

strings comparison matchers for chai

Normalize browsers' default style

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

provides locking mechanism to sync across browser tabs

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

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

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)

Auto mock all localstorage and sessionstorage APIs for your Jest tests

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

Microsoft Azure Storage SDK for JavaScript - Queue

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

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.

Faro instrumentations, metas, transports for web.

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

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

Populate a <canvas> element with a font texture atlas

Chromium Binary for Serverless Platforms

browserify compatible version of the ace editor.

<!-- markdownlint-disable MD024 -->

Consistent cross browser mouse wheel movement

AWS X-Ray ID generator for OpenTelemetry

Cascading grid layout library

Check if browser is Internet Explorer

A companion library to openai for Azure OpenAI.

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.

Extend Chai Assertion library with tests for http apis

Automated browser testing for the modern web development stack.

Advanced HTTP requests in node.js and browsers

ExpressJS/Connect/TrinteJS user-agent middleware exposing

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

Get the size of an element in pixels, including margins

Check if browser is Firefox

Faro web tracing implementation.

Chai plugin for JSON Schema v4

Check if a value is a `Blob`

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

A generated SDK for ContainerInstanceManagementClient.

tiny http client for Node and the browser

JavaScript barcode generator supporting over 100 types and standards.

insert a string of css into the <head>

Mouse wheel normalization across multiple multiple browsers.

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

Fast client-side asset builder

Base draggable class

Javascript string formatter for human readability

Auth0 headless browser sdk

AngularJS mocks for testing

memlab API

Generic browser priority queue.

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

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

memlab browser E2E interaction libraries

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

Emscripten distribution of libheif for Node.JS and the browser

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

get webrtc browser methods unprefixed

compute the bounding box of geojson features

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

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

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

Migrate older jQuery code to jQuery 3.0+

Use Ky in both Node.js and browsers

A regular expression that matches a CHANGELOG filename

A generated SDK for ComputeManagementClient.

Capture browser logs for logging in NodeJS

Fingerprint Pro JavaScript agent