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Light, fluffy, and always free - The AWS Local Emulator alternative
Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.
The industry standard for API mocking in JavaScript.
- msw
- mock
- mocking-framework
- service-worker
Most popular Mocking framework for unit tests written in Java
- mockito
- java
- mocking-framework
- testing-tools
HTTP server mocking and expectations library for Node.js
An email and SMTP testing tool with API for developers
- email-testing
- go
- golang
- smtp-server
Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL).
- mockery
- phpunit
- php
- stub
Record, Replay, and Stub HTTP Interactions.
Test spies, stubs and mocks for JavaScript.
- stubs
- javascript
- tdd
- test-driven-development
Test Automation Made Simple
- test-automation
- assertions
- testing-tools
- mock-server
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
TranslatedRAP, the second generation of the open-source API management tool from the Alimama (阿里妈妈) front-end team
A mock code autogenerator for Go
Catches mail and serves it through a dream.
- smtp
- server
- ruby
The most popular and friendly mocking framework for .NET
Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.
A client-side server to build, test and share your JavaScript app
A simple online fake REST API server
Ministack: Free, open-source local AWS emulator - 60+ services, Terraform compatible, real databases. Free forever. MIT licensed.
Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!
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.
- mock-server
- proxy
- java-client
- javascript-client
PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.
smtp4dev - the fake smtp email server for development and testing