JSPM

Open source, fullstack monitoring. Capture frontend errors, record server side logs, and visualize what broke with session replay.

Browser storage and cookies monitoring - Real-time tracking of localStorage, sessionStorage, cookies, and IndexedDB

A lightweight utility for monitoring JavaScript event loop lag in real-time

A generated SDK for MonitoringClient.

Professional video buffering analytics & tracking library for monitoring video streaming performance, buffering progress, and user experience in real-time. Perfect for video platforms, e-learning apps, and media analytics.

Official Coralogix SDK for browsers

Lightweight JavaScript monitoring library for browser and Next.js apps

Public logs API for OpenTelemetry

watch mode for browserify builds

Public API for OpenTelemetry

A SDK For Monitoring Browser Errors

A SDK For Monitoring Browser

Robust WebSocket utilities for Nostr applications with automatic reconnection, supporting both ESM and CommonJS. Features channel-based messaging, heartbeat monitoring, message queueing, and comprehensive error handling with type-safe handlers.

The string_decoder module from Node core

Array#isArray for older browsers

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

Node.js Buffer API, for the browser

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

ES2015 `Object.assign()` ponyfill

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

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.

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

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

the path module from node core for browsers

Lightweight browser detector

Universal WHATWG Fetch API for Node, Browsers and React Native

Convert a typed array to a Buffer without a copy

Microsoft Azure SDK for JavaScript - Aborter

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

High performance (de)compression in an 8kB package

JavaScript's functional programming helper library.

A monitoring endpoint for queen

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

JavaScript library for DOM operations

the stream module from node core for browsers

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

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

Parse and stringify URL query strings

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

A simple, lightweight JavaScript API for handling cookies

Get the default browser

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

HTML5 `FormData` for Browsers and Node.

https module compatability for browserify

Random number generator for browsers and node.js

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

JSON without touching any globals

node's constants module for the browser

Decode JWT tokens, mostly useful for browser applications.

Parse milliseconds into an object

the tty module from node core for browsers

Isomorphic implementation of WebSocket

timers module for browserify

vm module for the browser

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.

A polyfill for the Resize Observer API

Web monitoring package for monitor system

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

Lazy assertions without performance penalty

Copy stuff into clipboard using JS with fallbacks

Toggle current selected content in browser

Microsoft Azure SDK for JavaScript - Logger

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

Promisify an event by waiting for it to be emitted

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

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

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

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

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

Microsoft Azure Storage SDK for JavaScript - Blob

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

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

Isomorphic WebSocket

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

Normalize exceptions/errors

JavaScript SVG parser and renderer on Canvas.

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

Serializes any DOM node into a String

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)

Properly update an error's message

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

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

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.

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

A SDK For Monitoring Browser Errors

Plugin for loglevel message prefixing

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

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

Dynamic script loading for browser

HKDF with no dependencies using runtime's native crypto

A tool to get browser's scrollbars width.

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

browser-side require() the node way

Tests if ES6 @@toStringTag is supported.

Tests if ES6 Symbol is supported.

DOMParser.parseFromString for XML with IE8 fallback

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

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

Isomorphic client library for Azure KeyVault's keys.

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

Extends Chai with assertions about promises.

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

Array#filter for older browsers.

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

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

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

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

Unpack a browser type and version from the useragent string

sort module-deps output for deterministic browserify bundles

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

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

XMLHttpRequest emulation for node.js

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

Simple JS stack with auto run for node and browsers

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

Browser compatibility data provided by MDN Web Docs

A generated SDK for WebSiteManagementClient.

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

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

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

Create a MD5 hash with hex encoding

Node standard library for browser.

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

A generated SDK for ResourceManagementClient.

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

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!

Detect device type and render your component according to it

Get the paths of edge browser easily

Analyze and debug space usage through source maps

Minimal JavaScript module loader

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

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

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

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

A client for working with the BrowserStack APIs.

tap-producing test harness for node and browsers

Cross Platform implementation of the GitLab API

Browser port of the Node.js 'request' package

Mouse wheel normalization across multiple multiple browsers.

OpenTelemetry instrumentation for fetch http client in web browsers

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

Test whether value is error object

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

Check if mobile browser.

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

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

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

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

File manager plugin for CKEditor 5

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

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

A Minimalistic Wrapper for IndexedDB

Lint browser compatibility of API used

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

Simple JS queue with auto run for node and browsers

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

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

Isomorphic client library for Azure KeyVault's secrets.

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

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.

strings comparison matchers for chai

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)

Javascript audio library for the modern web.

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

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

Browser fingerprinting library with the highest accuracy and stability

The official Fullstory browser SDK

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

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

Google's libphonenumber pre-compiled with the closure compiler

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)

Logger Utils

Lightweight copy to clipboard for the web

Environment utilities

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

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

Compress images in the browser

Normalize browsers' default style

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

A pure JavaScript client for the tus resumable upload protocol

provides locking mechanism to sync across browser tabs

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

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

Extend Chai Assertion library with tests for http apis

Auto mock all localstorage and sessionstorage APIs for your Jest tests

Faro instrumentations, metas, transports for web.

Chromium Binary for Serverless Platforms

Populate a <canvas> element with a font texture atlas

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.

Check if a value is a `Blob`

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)

Microsoft Azure Storage SDK for JavaScript - Queue

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

<!-- markdownlint-disable MD024 -->

UI utilities

tiny http client for Node and the browser

browserify compatible version of the ace editor.

small function to append a query string to a URL

AWS X-Ray ID generator for OpenTelemetry

Consistent cross browser mouse wheel movement

Get the size of an element in pixels, including margins

Check if browser is Firefox

Check if browser is Internet Explorer

Cascading grid layout library

A companion library to openai for Azure OpenAI.

Advanced HTTP requests in node.js and browsers

Automated browser testing for the modern web development stack.

Mouse wheel normalization across multiple multiple browsers.

ExpressJS/Connect/TrinteJS user-agent middleware exposing

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

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

insert a string of css into the <head>

Faro web tracing implementation.

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

Chai plugin for JSON Schema v4

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

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

Render React components in Vitest Browser Mode

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

return all coordinates from a geojson object

Copy to clipboard.