Spawn an [Express](https://expressjs.com) server from your [Mock Service Worker](https://github.com/mswjs/msw) request handlers or apply them to an existing server using a middleware.
AWS Event mocks like SNS, S3, ect.
Import, export, require path redirect plugin for Babel
e2e utilities for use with Playwright and Connect
Mocks node.js http.ServerResponse. See also `mock-req`.
It simplifies mocking by auto-recording/stubbing HTTP interactions and automate the process of updating/deleting recordings.
Mock infrastructure for AI application testing — LLM APIs, image generation, image editing, text-to-speech, transcription, audio translation, audio generation, video generation, embeddings, MCP tools, A2A agents, AG-UI event streams, vector databases, sea
Tiny helper for express middleware testing
Testing, mocking and spying proxy
The node core libs for in browser usage.
Mock a Rest API or any backend service.
Simple yet powerful file-based mock server with recording abilities
Mock Service Worker browser and node integration for Vite
A Jest runner that runs tests directly in bare Node.js, without virtualizing the environment.
[![npm version][npm-version-src]][npm-version-href] [![npm downloads][npm-downloads-src]][npm-downloads-href] [![Github Actions][github-actions-src]][github-actions-href] [![Codecov][codecov-src]][codecov-href]
API mocking library that runs as a real HTTP server
KB Labs Studio data client — API SDK with versioned contracts, mocks, and TanStack Query hooks
Easily unit test LaunchDarkly feature flagged components with jest
Confidently unit and integration test your Next.js API routes/handlers in an isolated Next.js-like environment
Local drop-in replacement services for CI and no-network sandboxes
> [!WARNING] > ## Automock is Now Suites > > Automock has stopped at **version 2.1.0** and the project has been renamed to **Suites**, a more mature, actively > developed unit testing framework that extends and improves Automock's original design. > > ##
Built-in agent adapters for agent-mux
Wallet client for the `client` namespace of the [Vega wallet API v0.67.3](https://github.com/vegaprotocol/vega/tree/develop/wallet/api) based on its [openrpc specs](https://github.com/vegaprotocol/vega/blob/develop/wallet/api/openrpc.json).
Test setup utilities for React applications