1.floci-io / floci
Light, fluffy, and always free - The AWS Local Emulator alternative
+11,428 stars
from 18,159 · score 9.34
Trending repositories
Ranked by Attention Score: stars gained over the last 90 complete days
48 repositories by Attention Score · Aug 7, 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
+818 stars
from 10,025 · score 6.71
3.mswjs / msw
The industry standard for API mocking in JavaScript.
+249 stars
from 18,082 · score 5.52
4.typicode / json-server
Get a full fake REST API with zero coding in less than 30 seconds (seriously)
+205 stars
from 75,526 · score 5.33
5.stretchr / testify
A toolkit with common assertions and mocks that plays nicely with the standard library
+173 stars
from 26,071 · score 5.16
+137 stars
from 16,065 · score 4.93
7.mockoon / mockoon
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
+135 stars
from 8,334 · score 4.91
8.karatelabs / karate
Test Automation Made Simple
- test-automation
- assertions
- testing-tools
- mock-server
- automated-testing
- webdriver
- +10 more
+111 stars
from 8,894 · score 4.72
9.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
+103 stars
from 1,186 · score 4.64
10.kevin1024 / vcrpy
Automatically mock your HTTP interactions to simplify and speed up testing
+44 stars
from 2,978 · score 3.81
11.mockito / mockito
Most popular Mocking framework for unit tests written in Java
- mockito
- java
- mocking-framework
- testing-tools
- mocking
- mock
- +6 more
+39 stars
from 15,408 · score 3.69
12.nock / nock
HTTP server mocking and expectations library for Node.js
+32 stars
from 13,103 · score 3.50
13.tarampampam / webhook-tester
🔭 Powerful tool for testing WebHooks and more
+31 stars
from 521 · score 3.47
+27 stars
from 6,387 · score 3.33
15.mccutchen / go-httpbin
A reasonably complete and well-tested golang port of httpbin, with zero dependencies outside the go stdlib.
+26 stars
from 868 · score 3.30
16.oguimbal / pg-mem
An in memory postgres DB instance for your unit tests
- hacktoberfest
- pg-promise
- typeorm
- node-postgres
- pg-mem
- postgresql
- +9 more
+24 stars
from 2,354 · score 3.22
17.sj26 / mailcatcher
Catches mail and serves it through a dream.
+21 stars
from 6,763 · score 3.09
18.FakeItEasy / FakeItEasy
The easy mocking library for .NET
- mocking
- fake-objects
- dotnet
- dotnet-core
- hacktoberfest
+18 stars
from 1,836 · score 2.94
+14 stars
from 110 · score 2.71
20.matryer / moq
Interface mocking tool for go generate
+13 stars
from 2,193 · score 2.64
21.nnnkkk7 / snowflake-emulator
A lightweight Snowflake emulator built with Go and DuckDB for local development and testing
+13 stars
from 44 · score 2.64
22.maxbrunsfeld / counterfeiter
A tool for generating self-contained, type-safe test doubles in go
+11 stars
from 1,136 · score 2.48
23.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
+10 stars
from 391 · score 2.40
+7 stars
from 4,439 · score 2.08
25.bblimke / webmock
Library for stubbing and setting expectations on HTTP requests in Ruby.
+7 stars
from 4,046 · score 2.08
26.eranpeer / FakeIt
C++ mocking made easy. A simple yet very expressive, headers only library for c++ mocking.
+7 stars
from 1,365 · score 2.08
27.ardatan / graphql-tools
:wrench: Utility library for GraphQL to build, stitch and mock GraphQL schemas in the SDL-first approach
+6 stars
from 5,427 · score 1.95
28.richardszalay / mockhttp
Testing layer for Microsoft's HttpClient library. Create canned responses using a fluent API.
+6 stars
from 1,758 · score 1.95
+6 stars
from 747 · score 1.95
30.AliSoftware / OHHTTPStubs
Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!
+5 stars
from 5,061 · score 1.79
31.Brightify / Cuckoo
Boilerplate-free mocking framework for Swift!
- mock
- mockito
- cuckoo
- stub
- swift
- matcher
- +4 more
+5 stars
from 1,739 · score 1.79
32.darklynx / request-baskets
HTTP requests collector to test webhooks, notifications, REST clients and more ...
- webhooks
- test-automation
- qa
- testing
- http-requests
- rest
- +3 more
+5 stars
from 426 · score 1.79
+4 stars
from 2,075 · score 1.61
34.mocktools / go-smtp-mock
SMTP mock server written on Golang. Mimic any 📤 SMTP server behavior for your test environment with fake SMTP server.
- smtp
- smtp-mock
- smtp-server
- smtp-mail
- smtplib
- mock-server
- +10 more
+4 stars
from 166 · score 1.61
35.zuplo / mockbin
Mockbin by Zuplo. Mock, Test, and View HTTP Requests and Responses
- api-client
- api-management
- api-mock
- api-test
- api-testing
- mockbin
- +2 more
+4 stars
from 139 · score 1.61
36.vitalets / playwright-network-cache
Cache and mock network requests in Playwright
- cache
- network
- playwright
- playwright-javascript
- requests-mock
+4 stars
from 97 · score 1.61
37.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.
+3 stars
from 3,422 · score 1.39
38.WeTransfer / Mocker
Mock Alamofire and URLSession requests without touching your code implementation
- wt-branch-protection-two-approvals
- wt-branch-protection-exempt
+3 stars
from 1,187 · score 1.39
39.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
+3 stars
from 998 · score 1.39
40.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
+3 stars
from 521 · score 1.39
41.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
+3 stars
from 406 · score 1.39
42.APIs-guru / graphql-faker
🎲 Mock or extend your GraphQL API with faked data. No coding required.
+2 stars
from 2,711 · score 1.10
+2 stars
from 689 · score 1.10
+2 stars
from 560 · score 1.10
45.xhd2015 / xgo
All-in-one go testing library
+2 stars
from 429 · score 1.10
46.marmelab / json-graphql-server
Get a full fake GraphQL API with zero coding in less than 30 seconds.
- graphql
- graphql-server
- express-graphql
+1 stars
from 1,948 · score 0.69
47.kahlan / kahlan
:heavy_check_mark: PHP Test Framework for Freedom, Truth, and Justice
+1 stars
from 1,145 · score 0.69
48.pnuckowski / aioresponses
Aioresponses is a helper for mock/fake web requests in python aiohttp package.
+1 stars
from 555 · score 0.69