Lightweight debugging utility for Node.js and the browser

Tiny millisecond conversion utility

Safer Node.js Buffer API

Array#isArray for older browsers

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

A library to create readable "multipart/form-data" streams. Can be used to submit forms and file uploads to other web applications.

Node.js Buffer API, for the browser

Runtime for Regenerator-compiled generator and async functions.

babel's modular runtime helpers

Get and robustly cache all JS language-level intrinsics at first require time

Higher-order functions and common patterns for asynchronous code

Implementation of Function.prototype.bind

Media Type Database

Lodash modular utilities.

Express style path to RegExp utility

HTTP server cookie parsing and serialization

The ultimate javascript content-type utility.

Robustly `.call.bind()` a function

Determine if the JS environment has Symbol support. Supports spec, or shams.

Read/write IEEE754 floating point numbers from/to a Buffer or array-like object

ECMAScript spec abstract operations.

Base64 encoding/decoding in pure JS

Define multiple non-enumerable properties at once. Uses `Object.defineProperty` when available; falls back to standard assignment in older engines.

Serialize JavaScript to a superset of JSON that includes regular expressions and functions.

Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

An Object.keys replacement, in case Object.keys is not available. From https://github.com/es-shims/es5-shim

Standard library

Is this value a JS Typed Array? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.

Returns an array of Typed Array names that are available in the current environment

deep cloning of objects and arrays

Node.js's util module for all engines

Object.prototype.hasOwnProperty.call shortcut

random bytes from browserify stand alone

Is this an arguments object? It's a harder question than you think.

process information for node.js and browsers

Determine if a function is a native generator function.

ES2015-compliant shim for Object.is - differentiates between -0 and +0

the path module from node core for browsers

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

The lodash method `_.get` exported as a module.

A window.fetch polyfill.

A tiny invariant function

Emulate console for all the browsers

Manage session history with JavaScript

A pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module.

ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.

Check if something is a promise

Isomorphic WHATWG Fetch API, for Node & Browserify

Resolve URL pathnames using JavaScript

Are these two JavaScript values equal?

A tiny (less than 1k) event emitter library

foreach component + npm package

ECMAScript 2015 (ES6) Object.assign polyfill and ponyfill

Functional programming in TypeScript

Modern copy to clipboard. No Flash. Just 2kb

A WebGL interactive maps library

Browser console polyfill. Makes it safe to do console.log()-s etc always.

String formatting inspired by Python's str.format()

A polyfill for creating CustomEvents on IE9+ if the native implementation is missing.

Simple polyfill for URLSearchParams standard

Get notified when a DOM element enters or exits the viewport.