Industry standard API mocking for JavaScript.

Lightweight service virtualization/ API simulation / API mocking tool for developers and testers

HTTP/1.1, HTTP/2 and WebSockets stub server for stubbing distributed web services in Docker and non-containerized environments for integration and contract testing

Build and test APIs easily

Dynamic API, S3 & Mail mocking for web, mobile & microservice development.

Build web applications today against the GraphQL APIs of tomorrow.

Your API mocking tool for OpenAPI and AsyncAPI using Go and JavaScript - https://mokapi.io

A tool that enables you to - Generate fake data in formats like JSON, Python, JS, Ruby, PHP and SQL - Mock restful APIs with Bearer authentication without writing a single line of code with a drag and drop interface.

The first fetch/XMLHttpRequest network-mocking library that's actually user-friendly

The ultimate webhook testing suite for developers. Capture, inspect, and replay requests in real-time without tunnels. Features API mocking (custom status/latency), secure forwarding, JSON Schema validation, and live SSE streaming. Perfect for debugging Stripe, GitHub, Shopify & Zapier workflows.

A versatile Go tool for effortlessly generating mock HTTP APIs for all your needs.

A lightweight and easy to use RESTful api mocking server

Mock Service Worker Tools (MSW-Tools) is a data Mock tool built based on MSW.JS and Svelte. It is used for data linkage between front and back end interfaces, facilitating developers to perform functional tests in different data and scenarios.

Unified data modeling

A lightweight, specification-first Go API mock server that generates realistic responses from OpenAPI 3.0 specifications.

A powerful fetch mocking library designed specifically for Bun tests

Demo of how to mock API's in Playwright for e2e testing

A lightweight TypeScript library for mocking API endpoints during frontend development. Perfect for developing frontend applications before the backend is ready, or for testing different API scenarios.

🐙 Multi-armed mocks for LLM apps - Drop-in replacement for OpenAI/Anthropic APIs for deterministic testing

A powerful IntelliJ IDEA plugin that combines the proxy and interception capabilities similar to Nginx and Charles, designed specifically for local development environments. It intelligently intercepts HTTP requests, either returning custom mock data or acting as a proxy server to forward real requests to the original server with full HTTP

Instantly generate mock REST APIs powered by LLMs (GPT/Gemini). Just describe your endpoint—MockGen does the rest. Docker-ready, fast, and open source.

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Examples for various types of Karate tests, used in my conference talk "Karate - beyond API testing".

High-performance, multi-protocol mock server. HTTP, WebSocket, gRPC, MQTT, SSE, GraphQL, SOAP in one binary.

No description provided.

MIMICORE is a high-performance, declarative API Gateway and API Mocking Platform written in Go.

Agent skills for Microcks : API mocking and testing from OpenAPI specifications

Generate full-featured REST APIs from Pydantic models in seconds. Zero config, type-safe mock API server for testing and prototyping.

Mock server to help development of UI and Mobile apps

TwinBridge — capture, replay, and diff your APIs. Build and test offline against twins that learned from your real traffic.