1.mswjs / msw
The industry standard for API mocking in JavaScript.
+257 stars
from 18,069 · score 5.55
Trending repositories
Ranked by Attention Score: stars gained over the last 90 complete days
28 repositories by Attention Score · Aug 5, 2026 – Nov 2, 2026 (UTC)
2.stretchr / testify
A toolkit with common assertions and mocks that plays nicely with the standard library
+173 stars
from 26,067 · score 5.16
3.mockoon / mockoon
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
+138 stars
from 8,329 · score 4.93
4.wiremock / wiremock
A tool for mocking HTTP services
+111 stars
from 7,304 · score 4.72
5.godot-gdunit-labs / gdUnit4
Embedded unit testing framework for Godot 4 supporting GDScript and C#. Features test-driven development, embedded test inspector, extensive assertions, mocking, scene testing.
+106 stars
from 1,180 · score 4.67
6.stoplightio / prism
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
+80 stars
from 4,984 · score 4.39
7.microcks / microcks
The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀
+75 stars
from 1,998 · score 4.33
8.pester / Pester
Pester is the ubiquitous test and mock framework for PowerShell.
+63 stars
from 3,309 · score 4.16
9.mockito / mockito
Most popular Mocking framework for unit tests written in Java
+49 stars
from 15,403 · score 3.91
10.vektra / mockery
A mock code autogenerator for Go
+46 stars
from 7,129 · score 3.85
11.kevin1024 / vcrpy
Automatically mock your HTTP interactions to simplify and speed up testing
+44 stars
from 2,978 · score 3.81
12.SpectoLabs / hoverfly
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers
+33 stars
from 2,500 · score 3.53
13.nsubstitute / NSubstitute
A friendly substitute for .NET mocking libraries.
+23 stars
from 2,960 · score 3.18
14.FakeItEasy / FakeItEasy
The easy mocking library for .NET
+20 stars
from 1,835 · score 3.04
15.matryer / moq
Interface mocking tool for go generate
+14 stars
from 2,192 · score 2.71
16.mockery / mockery
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).
+12 stars
from 10,713 · score 2.56
17.richardszalay / mockhttp
Testing layer for Microsoft's HttpClient library. Create canned responses using a fluent API.
+7 stars
from 1,757 · score 2.08
18.AliSoftware / OHHTTPStubs
Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!
+6 stars
from 5,060 · score 1.95
19.Brightify / Cuckoo
Boilerplate-free mocking framework for Swift!
+5 stars
from 1,739 · score 1.79
20.3lvis / Networking
Swift HTTP Networking with stubbing and caching support
+5 stars
from 1,376 · score 1.79
21.zuplo / mockbin
Mockbin by Zuplo. Mock, Test, and View HTTP Requests and Responses
+4 stars
from 139 · score 1.61
22.tianchangNorth / pocket-mocker
In-page HTTP controller for frontend development. Intercept, modify, and simulate API responses directly in the browser.
+3 stars
from 522 · score 1.39
23.mindflayer / python-mocket
a socket mock framework - for all kinds of socket animals, web-clients included
+3 stars
from 310 · score 1.39
24.atilaneves / unit-threaded
Advanced unit test framework for D
+2 stars
from 122 · score 1.10
25.powermock / powermock
PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.
+1 stars
from 4,164 · score 0.69
26.pnuckowski / aioresponses
Aioresponses is a helper for mock/fake web requests in python aiohttp package.
+1 stars
from 555 · score 0.69
27.natenho / Mockaco
🐵 HTTP mock server, useful to stub services and simulate dynamic API responses, leveraging ASP.NET Core features, built-in fake data generation and pure C# scripting
+1 stars
from 350 · score 0.69
28.SpectoLabs / hoverfly-java
Java binding for Hoverfly
+1 stars
from 176 · score 0.69