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

A SDK For Monitoring Browser

The string_decoder module from Node core

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.

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

Array#isArray for older browsers

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

Node.js Buffer API, for the browser

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

ES2015 `Object.assign()` ponyfill

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

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

Determine if an object is a Buffer

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

Universal WHATWG Fetch API for Node, Browsers and React Native

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

JavaScript's functional programming helper library.

MCP (Model Context Protocol) server for browser tools integration

Base class for node which OpenTelemetry instrumentation modules extend

Lightweight browser detector

A simple, lightweight JavaScript API for handling cookies

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

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

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

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

High performance (de)compression in an 8kB package

Microsoft Azure SDK for JavaScript - Aborter

the path module from node core for browsers

A monitoring endpoint for queen

Convert a typed array to a Buffer without a copy

Get the default browser

JavaScript library for DOM operations

Random number generator for browsers and node.js

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

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

the stream module from node core for browsers

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.

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

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

Microsoft Azure SDK for JavaScript - Logger

Decode JWT tokens, mostly useful for browser applications.

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

https module compatability for browserify

Parse milliseconds into an object

JSON without touching any globals

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

Isomorphic implementation of WebSocket

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

the tty module from node core for browsers

vm module for the browser

node's constants module for the browser

timers module for browserify

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)

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.

JavaScript SVG parser and renderer on Canvas.

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

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

Get a KeyboardEvent.key-style string from an event

Check if a value is an `Error` instance

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

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

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

Plugin for loglevel message prefixing

DOMParser.parseFromString for XML with IE8 fallback

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

LRU and FIFO caches for Client or Server

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

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

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

Topological sort of directed acyclic graphs (like dependecy lists)

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

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

HKDF with no dependencies using runtime's native crypto

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

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

sort module-deps output for deterministic browserify bundles

A tool to get browser's scrollbars width.

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

Tests if ES6 Symbol is supported.

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

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

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

Tests if ES6 @@toStringTag is supported.

A generated SDK for WebSiteManagementClient.

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

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

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

Isomorphic client library for Azure KeyVault's keys.

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

Get the paths of edge browser easily

Extends Chai with assertions about promises.

Detect device type and render your component according to it

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

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

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

Simple JS stack with auto run for node and browsers

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

tap-producing test harness for node and browsers

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

Array#filter for older browsers.

OpenTelemetry instrumentation for fetch http client in web browsers

XMLHttpRequest emulation for node.js

Unpack a browser type and version from the useragent string

Check if mobile browser.

Create a MD5 hash with hex encoding

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

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)

Analyze and debug space usage through source maps

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

A Minimalistic Wrapper for IndexedDB

A generated SDK for ResourceManagementClient.

Isomorphic client library for Azure KeyVault's secrets.

Lint browser compatibility of API used

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

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

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

Browser fingerprinting library with the highest accuracy and stability

Simple JS queue with auto run for node and browsers

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

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

The official Fullstory browser SDK

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

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

Cross Platform implementation of the GitLab API

Simple JS queue with auto run for node and browsers

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

Environment utilities

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

Browser port of the Node.js 'request' package

Javascript audio library for the modern web.

Test whether value is error object

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

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

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

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

Logger Utils

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.

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

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

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

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

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

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

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)

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

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)

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

AWS X-Ray ID generator for OpenTelemetry

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

Lint CSS for browser support against caniuse database

A pure JavaScript client for the tus resumable upload protocol

Compress images in the browser

Auto mock all localstorage and sessionstorage APIs for your Jest tests

Check if browser is Internet Explorer

Normalize browsers' default style

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

provides locking mechanism to sync across browser tabs

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

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.

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

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

A companion library to openai for Azure OpenAI.

Chromium Binary for Serverless Platforms

Auth0 headless browser sdk

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

Javascript string formatter for human readability

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

Cascading grid layout library

Check if a value is a `Blob`

browserify compatible version of the ace editor.

Consistent cross browser mouse wheel movement

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

tiny http client for Node and the browser

Generic browser priority queue.

Use Ky in both Node.js and browsers

compute the bounding box of geojson features

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