Mock localStorage for headless unit tests
Use websockets with the node streams API. Works in browser and node, with all current WS versions
Browser automation CLI for AI agents
Seamless REST/GraphQL API mocking library for browser and Node.js.
Node standard library for browser.
Statsig Node.js SDK for usage in multi-user server environments.
SimpleWebAuthn for Browsers
Streaming http in the browser
Posthog-js allows you to automatically capture usage and send events to PostHog.
Universal Javascript error reporting. Automatically detect JavaScript errors in the browser and Node.js, with plugins for React, Vue, Angular, Express, Restify and Koa.
Mock 'http' objects for testing Express, Next.js and Koa routing functions
elegant & feature rich browser / node HTTP with a fluent API
Check in which environment the code is running - browser/node.js/webworker/jsdom/deno
HTML5 `FormData` for Browsers and Node.
Parsing the JavaScript's RegExp in JavaScript.
Utility to wait for a TCP port to open.
Mock http requests made using fetch
The AWS Encryption SDK for JavaScript is a client-side encryption library designed to make it easy for everyone to encrypt and decrypt data using industry standards and best practices. It uses a data format compatible with the AWS Encryption SDKs in other
An in-memory implementation of webextension-polyfill for testing. Supports all test frameworks (Vitest, Jest, etc)
pure js diffie-hellman
A library for obtaining browser versions with their maximum supported Baseline feature set and Widely Available status.
The type registry for typeson
A slimmed version of the Statsig Node.js SDK.
Cypress is a next generation front end testing tool built for the modern web