API Mocking

Prism

API Testing Platforms

Open source HTTP mock and validation server that generates realistic responses from OpenAPI specifications.

Mockoon

API Testing Platforms

Desktop application for creating mock REST APIs with templating, response rules, and proxy mode for local development.

Mockbin

API Testing Platforms

Simple mock HTTP server by Kong for testing and debugging HTTP calls from your apps.

Microcks

API Testing Platforms

Open source Kubernetes-native tool for mocking and testing APIs and microservices from OpenAPI and AsyncAPI specs.

MockServer

A/B Testing

Open source tool for mocking any system integrated via HTTP or HTTPS with a Java-based mock and proxy server.

Mockaroo

Developer Experience Platforms

Realistic test data generation platform creating data in multiple formats with REST API mocks.

MSW

API Testing Tools

API mocking library for JavaScript that intercepts network requests using Service Workers for browser and Node.js testing.

Hoverfly

A/B Testing

Lightweight API simulation tool for creating HTTP service virtualizations to enable fast parallel development and testing.

WireMock

API Testing Tools

Flexible API mocking tool for testing microservices and APIs by simulating HTTP-based APIs for reliable integration testing.

Requestly

API Testing Platforms

Browser extension and desktop app for intercepting, modifying, and mocking HTTP requests for debugging and testing.