Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.

Build a fake backend by providing the content of JSON files or JavaScript objects through configurable routes.

gRPC Mock Server

Yeoman generator for building a fake backend by providing the content of JSON files or JavaScript objects through configurable routes.

The HTTP server stub you always wanted!

The tiniest http endpoints simulator

Build JSON API with authentication in just minutes.

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

Your lightweight, Python-native HTTP mocking server

Intelligent Model Context Protocol (MCP) server for AI-assisted API development. Generate mock servers from OpenAPI specs with advanced logging, performance analytics, and server discovery. Optimized for AI development workflows with comprehensive testing insights and automated analysis.

kassette is a development server, used mainly for testing, which proxies requests and is able to easily manage local mocks.

This library allows to mock HTTP responses for integration, component and acceptance tests of your projects written in C# / .NET by hosting a webserver returning configured responses.

GitHub Action for Mockoon CLI

Prototyping Android Apps Without Server API's

HTTP stub server from plain files

[:construction_worker: :hammer: :wrench: WIP!!] Highly configurable mocking server. Speeds your Front End development workflow! :rocket:

Postern a tool for mocking API's locally for frontend development and testing

Simple test doubles over the wire

http mocking, assert and proxy server for development and testing

Simple portable collect api and json server