Get a full fake REST API with zero coding in less than 30 seconds (seriously)
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TranslatedYApi is a visual API management platform that can be deployed locally and connects front-end, back-end, and QA
- api
- api-manager
- api-management
- api-test
Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.
A simulation data generator
Most popular Mocking framework for unit tests written in Java
- mockito
- java
- mocking-framework
- testing-tools
HTTP Request & Response Service, written in Python + Flask.
- http
- http-server
- testing
- service
An email and SMTP testing tool with API for developers
- email-testing
- go
- golang
- smtp-server
Test spies, stubs and mocks for JavaScript.
- stubs
- javascript
- tdd
- test-driven-development
A persistent service that generates mock data quickly and provids visualization view.
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
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
mocking library for Kotlin
- verification
- chain-calls
- matcher
- argument-matchers
A client-side server to build, test and share your JavaScript app
:wrench: Utility library for GraphQL to build, stitch and mock GraphQL schemas in the SDL-first approach
- graphql-schema
- schema-language
- graphql
- graphql-api
Ministack: Free, open-source local AWS emulator - 60+ services, Terraform compatible, real databases. Free forever. MIT licensed.
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
- oas
- prism
- mocking
- api-testing
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
A utility for mocking out the Python Requests library.
- tag-production
smtp4dev - the fake smtp email server for development and testing
HTTP Toolkit is a beautiful & open-source tool for debugging, testing and building with HTTP(S) on Windows, Linux & Mac :tada: Open an issue here to give feedback or ask for help.
- feedback
- developer-tools
- http
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.
Papercut SMTP -- The Simple Desktop Email Server