A toolkit with common assertions and mocks that plays nicely with the standard library

• UpdatedFeb 17, 2026
• Go

Industry standard API mocking for JavaScript.

• UpdatedFeb 16, 2026
• TypeScript

Most popular Mocking framework for unit tests written in Java

• UpdatedFeb 13, 2026
• Java

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).

• UpdatedJan 28, 2026
• PHP

Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.

• UpdatedFeb 14, 2026
• TypeScript

A tool for mocking HTTP services

• UpdatedFeb 19, 2026
• Java

A mock code autogenerator for Go

• UpdatedFeb 13, 2026
• Go

Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!

• UpdatedMay 9, 2024
• Objective-C

Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.

• UpdatedFeb 18, 2026
• TypeScript

PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.

• UpdatedJan 3, 2024
• Java

Axios adapter that allows to easily mock requests

• UpdatedFeb 7, 2026
• JavaScript

Pester is the ubiquitous test and mock framework for PowerShell.

• UpdatedJan 29, 2026
• PowerShell

Automatically mock your HTTP interactions to simplify and speed up testing

• UpdatedFeb 20, 2026
• Python

A friendly substitute for .NET mocking libraries.

• UpdatedFeb 16, 2026
• C#

Lightweight service virtualization/ API simulation / API mocking tool for developers and testers

• UpdatedFeb 14, 2026
• Go

Intercept HTTP requests at the Python socket level. Fakes the whole socket module

• UpdatedJun 9, 2024
• Python

HTTP traffic mocking and testing made easy in Go ༼ʘ̚ل͜ʘ̚༽

• UpdatedSep 24, 2024
• Go

Interface mocking tool for go generate

• UpdatedAug 31, 2025
• Go

Over the wire test doubles

• UpdatedFeb 18, 2026
• JavaScript

Insomnia Mockbin is the underlying backend for the API mocks capability of Insomnia. It is built and used by Kong, the author of the open-source Kong Gateway.

• UpdatedFeb 10, 2026
• JavaScript