JSPM

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

Lightweight JavaScript monitoring library for browser and Next.js apps

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

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

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

Public API for OpenTelemetry

Public logs API for OpenTelemetry

watch mode for browserify builds

A SDK For Monitoring Browser Errors

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.

A SDK For Monitoring Browser

The string_decoder module from Node core

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

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

Node.js Buffer API, for the browser

Array#isArray for older browsers

ES2015 `Object.assign()` ponyfill

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

A lightweight, type-safe localStorage utility with advanced querying, filtering, cross-tab communication, and storage monitoring

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

Determine if an object is a Buffer

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

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

Base class for node which OpenTelemetry instrumentation modules extend

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

Universal WHATWG Fetch API for Node, Browsers and React Native

Lightweight browser detector

MCP (Model Context Protocol) server for browser tools integration

JavaScript's functional programming helper library.

Microsoft Azure SDK for JavaScript - Aborter

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

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

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

A simple, lightweight JavaScript API for handling cookies

Get the default browser

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

High performance (de)compression in an 8kB package

the stream module from node core for browsers

the path module from node core for browsers

A monitoring endpoint for queen

HTML5 `FormData` for Browsers and Node.

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

JavaScript library for DOM operations

Random number generator for browsers and node.js

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

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

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

Parse and stringify URL query strings

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

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

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

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

https module compatability for browserify

Decode JWT tokens, mostly useful for browser applications.

Microsoft Azure SDK for JavaScript - Logger

JSON without touching any globals

Parse milliseconds into an object

node's constants module for the browser

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

Isomorphic implementation of WebSocket

the tty module from node core for browsers

vm module for the browser

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

timers module for browserify

A polyfill for the Resize Observer API

Web monitoring package for monitor system

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

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

resolve which handles browser field support in package.json

Lazy assertions without performance penalty

Copy stuff into clipboard using JS with fallbacks

Toggle current selected content in browser

Promisify an event by waiting for it to be emitted

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

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

A SDK For Monitoring Browser Errors

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

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

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

JavaScript SVG parser and renderer on Canvas.

Check if a value is an `Error` instance

Get a KeyboardEvent.key-style string from an event

Microsoft Azure Storage SDK for JavaScript - Blob

Check if a value is a natural number

Cross-browser `CustomEvent` constructor

Tiny and elegant HTTP client based on the Fetch API

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

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.

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

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

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

Plugin for loglevel message prefixing

Dynamic script loading for browser

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

Isomorphic WebSocket

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

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

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

browser-side require() the node way

Topological sort of directed acyclic graphs (like dependecy lists)

Serializes any DOM node into a String

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

Properly update an error's message

DOMParser.parseFromString for XML with IE8 fallback

LRU and FIFO caches for Client or Server

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

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

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

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

HKDF with no dependencies using runtime's native crypto

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

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

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

A tool to get browser's scrollbars width.

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

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

Simple JS stack with auto run for node and browsers

Tests if ES6 Symbol is supported.

sort module-deps output for deterministic browserify bundles

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

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

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

Tests if ES6 @@toStringTag is supported.

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

A generated SDK for WebSiteManagementClient.

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

Isomorphic client library for Azure KeyVault's keys.

Extends Chai with assertions about promises.

Get the paths of edge browser easily

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

Detect device type and render your component according to it

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

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

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

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

Unpack a browser type and version from the useragent string

Browser compatibility data provided by MDN Web Docs

Create a MD5 hash with hex encoding

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

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

Array#filter for older browsers.

tap-producing test harness for node and browsers

Analyze and debug space usage through source maps

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!

XMLHttpRequest emulation for node.js

OpenTelemetry instrumentation for fetch http client in web browsers

Check if mobile browser.

Node standard library for browser.

File manager plugin for CKEditor 5

Simple JS queue with auto run for node and browsers

A generated SDK for ResourceManagementClient.

Mouse wheel normalization across multiple multiple browsers.

OpenTelemetry instrumentation for XMLHttpRequest http client in web browsers

A client for working with the BrowserStack APIs.

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

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

Tiny local JSON database for Node, Electron and the browser

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

Minimal JavaScript module loader

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

Cross Platform implementation of the GitLab API

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

A Minimalistic Wrapper for IndexedDB

Isomorphic client library for Azure KeyVault's secrets.

Lint browser compatibility of API used

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

Javascript audio library for the modern web.

Browser port of the Node.js 'request' package

The official Fullstory browser SDK

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

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

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

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

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

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

Test whether value is error object

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

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.

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

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

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

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

Google's libphonenumber pre-compiled with the closure compiler

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

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

strings comparison matchers for chai

Lightweight copy to clipboard for the web

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

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

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

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

Compress images in 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)

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

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

Auto mock all localstorage and sessionstorage APIs for your Jest tests

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

Microsoft Azure Storage SDK for JavaScript - Queue

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

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

Normalize browsers' default style

Lint CSS for browser support against caniuse database

AWS X-Ray ID generator for OpenTelemetry

A pure JavaScript client for the tus resumable upload protocol

provides locking mechanism to sync across browser tabs

Check if browser is Internet Explorer

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

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

Chromium Binary for Serverless Platforms

A companion library to openai for Azure OpenAI.

Extend Chai Assertion library with tests for http apis

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

Populate a <canvas> element with a font texture atlas

Faro instrumentations, metas, transports for web.

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

<!-- markdownlint-disable MD024 -->

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

Chai plugin for JSON Schema v4

Check if a value is a `Blob`

tiny http client for Node and the browser

JavaScript barcode generator supporting over 100 types and standards.

small function to append a query string to a URL

Cascading grid layout library

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

Auth0 headless browser sdk

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

Javascript string formatter for human readability

browserify compatible version of the ace editor.

Consistent cross browser mouse wheel movement

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

ExpressJS/Connect/TrinteJS user-agent middleware exposing

Faro web tracing implementation.

Get the size of an element in pixels, including margins

Check if browser is Firefox

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

Generic browser priority queue.

memlab browser E2E interaction libraries

Use Ky in both Node.js and browsers