API Mocking

Requestly

API Testing Platforms

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

Mockaroo

API Mocking

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

Rystic

API Mocking

API simulators for testing and training agents locally

Mockoon

API Mocking

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

Mockbin

API Mocking

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

Microcks

API Mocking

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

MockServer

API Mocking

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

MSW

API Mocking

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

Hoverfly

API Mocking

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

Prism

API Mocking

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

WireMock

API Mocking

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

httpbin

API Testing Tools

HTTP Request & Response Service written in Python for testing HTTP clients and APIs.