mock-server

Test Automation Made Simple

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

A tool for mocking HTTP services

Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!

Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.

MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.

Java client for Kubernetes & OpenShift

The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀

Terminal API client for HTTP, GraphQL and gRPC. Plain .http files you can diff and version, with workflows, mocks, profiling, tracing, OpenAPI import, SSH tunnels, Kubernetes port-forwards, WebSocket, SSE and a CLI runner.

WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on WireMock Java, but extended and different functionality. Full documentation can be found at https://wiremock.org/dotnet/.

Smocker is a simple and efficient HTTP mock server and proxy

Mock everything your AI app talks to — LLM APIs, MCP, A2A, AG-UI, vector DBs, search. One package, one port, zero dependencies.

Powerful friendly HTTP mock server & proxy library

Simulate API failures, throttling, and chaos — all from your command line.

接口自动化测试平台——python+flask版，支持http协议,java 版本开发完毕https://github.com/liwanlei/plan

Official master for the Greenmail project

HTTP mocking library for Rust

REST API Testing Tool for all levels in a Test Pyramid

Simple way to generate mock servers written in Go

OpenAPI mock server with random data generation