Multi-protocol mock server for HTTP, gRPC, GraphQL, WebSocket, MQTT, SSE, and SOAP. One Go binary, zero dependencies. Supports stateful CRUD, digital twins (passes real SDK tests), chaos engineering, OpenAPI/Postman/HAR/cURL import, and a built-in MCP server for AI agents.
Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers.
Built from the ground up for mobile developers. Monitor network requests, logs, and events in real-time. Debug faster, ship with confidence.
Free desktop API mocking platform. Create HTTP/REST and WebSocket mock servers with a modern UI. Perfect for developers, QA teams, and trainers.
Instantly create HTTP mock API endpoints with custom responses, dynamic path params, custom headers, configurable delays, and real-time traffic logs.
United States
Germany
EU
India