Open source
Mockoon
Create and run mock APIs locally with free open-source tools
Mocking TestingLocal mock API server
Alternatives to WireMock
12 tools like WireMock, chosen by what they do. About WireMock
Freemium
Beeceptor
Hosted mock server builder for REST, SOAP, GraphQL and gRPC APIs
Mocking TestingHosted mock APIs
Open source
Open source
Schemathesis
Open source tool that tests APIs by generating cases from schemas
Mocking TestingProperty based API testing
Open source
Microcks
Cloud native open source tool for API mocking and testing
Mocking TestingAPI mocking and testing
Open source
Mock Service Worker
API mocking library for browser and Node.js
Mocking TestingMock APIs at network level
Open source
MockServer
Open source mock, proxy and recording server for HTTP and gRPC
Mocking TestingMock and proxy HTTP
Open source
REST Assured
Java library for testing and validating REST APIs with simple syntax
Mocking TestingJava REST API testing
Open source
Step CI
Open source API testing framework with YAML workflows and CI support
Mocking TestingAPI testing and monitoringInactive
Open source
Pact
Consumer-driven contract testing for APIs, web apps and microservices
Mocking TestingConsumer driven contract tests
Open source
Open source
httpbin
Simple HTTP service that echoes requests and returns test responses
Public APIsHTTP request testing serviceInactive