1.floci-io / floci
Light, fluffy, and always free - The AWS Local Emulator alternative
+25,226 stars
from 4,361 · score 10.14
Trending repositories
Ranked by Attention Score: stars gained over the last 180 complete days
46 repositories by Attention Score · May 9, 2026 – Nov 4, 2026 (UTC)
2.axllent / mailpit
An email and SMTP testing tool with API for developers
- email-testing
- go
- golang
- smtp-server
- smtp-relay
- smtp-testing
- +2 more
+1,568 stars
from 9,275 · score 7.36
3.typicode / json-server
Get a full fake REST API with zero coding in less than 30 seconds (seriously)
+549 stars
from 75,182 · score 6.31
4.mswjs / msw
The industry standard for API mocking in JavaScript.
+526 stars
from 17,805 · score 6.27
5.stretchr / testify
A toolkit with common assertions and mocks that plays nicely with the standard library
+432 stars
from 25,812 · score 6.07
+322 stars
from 15,880 · score 5.78
7.mockoon / mockoon
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
+264 stars
from 8,205 · score 5.58
8.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.
- test-automation
- testing
- testing-tools
- unit-test
- unittest
- unittest-framework
- +6 more
+247 stars
from 1,042 · score 5.51
9.karatelabs / karate
Test Automation Made Simple
- test-automation
- assertions
- testing-tools
- mock-server
- automated-testing
- webdriver
- +10 more
+201 stars
from 8,804 · score 5.31
10.mockito / mockito
Most popular Mocking framework for unit tests written in Java
- mockito
- java
- mocking-framework
- testing-tools
- mocking
- mock
- +6 more
+106 stars
from 15,341 · score 4.67
11.tarampampam / webhook-tester
🔭 Powerful tool for testing WebHooks and more
+87 stars
from 465 · score 4.48
12.nock / nock
HTTP server mocking and expectations library for Node.js
+74 stars
from 13,061 · score 4.32
+68 stars
from 6,346 · score 4.23
14.kevin1024 / vcrpy
Automatically mock your HTTP interactions to simplify and speed up testing
+68 stars
from 2,954 · score 4.23
15.oguimbal / pg-mem
An in memory postgres DB instance for your unit tests
- hacktoberfest
- pg-promise
- typeorm
- node-postgres
- pg-mem
- postgresql
- +9 more
+65 stars
from 2,313 · score 4.19
16.mccutchen / go-httpbin
A reasonably complete and well-tested golang port of httpbin, with zero dependencies outside the go stdlib.
+59 stars
from 835 · score 4.09
17.sj26 / mailcatcher
Catches mail and serves it through a dream.
+53 stars
from 6,731 · score 3.99
18.FakeItEasy / FakeItEasy
The easy mocking library for .NET
- mocking
- fake-objects
- dotnet
- dotnet-core
- hacktoberfest
+33 stars
from 1,821 · score 3.53
19.specmatic / specmatic
Shift-left API Integration | Auto-fix integration drift before integration. Specmatic turns API specifications into executable contracts, continuously verifying that every change made by AI coding agents and engineers stays true to the desired behaviour. Ship AI-ready APIs 10x faster, from intent to implementation, with Spec-Driven API Development.
- contract-testing
- microservices
- contract-driven-development
- cdd
- specmatic
- asyncapi
- +10 more
+31 stars
from 370 · score 3.47
+28 stars
from 4,418 · score 3.37
21.maxbrunsfeld / counterfeiter
A tool for generating self-contained, type-safe test doubles in go
+23 stars
from 1,124 · score 3.18
22.matryer / moq
Interface mocking tool for go generate
+22 stars
from 2,184 · score 3.14
23.travisjeffery / timecop
A gem providing "time travel", "time freezing", and "time acceleration" capabilities, making it simple to test time-dependent code. It provides a unified method to mock Time.now, Date.today, and DateTime.now in a single call.
+19 stars
from 3,406 · score 3.00
24.eranpeer / FakeIt
C++ mocking made easy. A simple yet very expressive, headers only library for c++ mocking.
+19 stars
from 1,353 · score 3.00
25.ardatan / graphql-tools
:wrench: Utility library for GraphQL to build, stitch and mock GraphQL schemas in the SDL-first approach
+18 stars
from 5,415 · score 2.94
26.AliSoftware / OHHTTPStubs
Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!
+14 stars
from 5,052 · score 2.71
27.richardszalay / mockhttp
Testing layer for Microsoft's HttpClient library. Create canned responses using a fluent API.
+13 stars
from 1,751 · score 2.64
28.darklynx / request-baskets
HTTP requests collector to test webhooks, notifications, REST clients and more ...
- webhooks
- test-automation
- qa
- testing
- http-requests
- rest
- +3 more
+12 stars
from 419 · score 2.56
+11 stars
from 742 · score 2.48
30.bblimke / webmock
Library for stubbing and setting expectations on HTTP requests in Ruby.
+10 stars
from 4,043 · score 2.40
+10 stars
from 2,069 · score 2.40
32.PSPDFKit-labs / bypass
Bypass provides a quick way to create a custom plug that can be put in place instead of an actual HTTP server to return prebaked responses to client requests.
- testing
- http
- https
- mock
- api-testing
- elixir
- +2 more
+10 stars
from 991 · score 2.40
33.WeTransfer / Mocker
Mock Alamofire and URLSession requests without touching your code implementation
- wt-branch-protection-two-approvals
- wt-branch-protection-exempt
+9 stars
from 1,181 · score 2.30
34.APIs-guru / graphql-faker
🎲 Mock or extend your GraphQL API with faked data. No coding required.
+8 stars
from 2,705 · score 2.20
35.Brightify / Cuckoo
Boilerplate-free mocking framework for Swift!
- mock
- mockito
- cuckoo
- stub
- swift
- matcher
- +4 more
+8 stars
from 1,736 · score 2.20
36.ttu / dotnet-fake-json-server
Fake JSON Server is a Fake REST API that can be used as a Back End for prototyping or as a template for a CRUD Back End.
- csharp
- webapi
- dotnet-core
- dynamic
- json
- fake-data
- +3 more
+7 stars
from 402 · score 2.08
37.tianchangNorth / pocket-mocker
In-page HTTP controller for frontend development. Intercept, modify, and simulate API responses directly in the browser.
- api
- devtools
- mock
- mocking
- web
- developer-tools
- +7 more
+6 stars
from 517 · score 1.95
+5 stars
from 8,457 · score 1.79
39.xnbox / DeepfakeHTTP
DeepfakeHTTP is a web server that uses HTTP dumps as a source for responses.
- http-server
- dump
- dummy
- testing
- testing-tools
- test-automation
- +14 more
+5 stars
from 519 · score 1.79
40.xhd2015 / xgo
All-in-one go testing library
+5 stars
from 426 · score 1.79
41.marmelab / json-graphql-server
Get a full fake GraphQL API with zero coding in less than 30 seconds.
- graphql
- graphql-server
- express-graphql
+3 stars
from 1,946 · score 1.39
+2 stars
from 689 · score 1.10
43.marmelab / FakeRest
Patch fetch/XMLHttpRequest to fake a REST API server in the browser, based on JSON data.
+2 stars
from 452 · score 1.10
44.thlorenz / proxyquire
🔮 Proxies nodejs require in order to allow overriding dependencies during testing.
+1 stars
from 2,742 · score 0.69
45.parroty / exvcr
HTTP request/response recording library for elixir, inspired by VCR.
+1 stars
from 745 · score 0.69
46.liip / LiipFunctionalTestBundle
Some helper classes for writing functional tests in Symfony
- php
- bundle
- symfony
- symfony-bundle
+1 stars
from 645 · score 0.69