Get a full fake REST API with zero coding in less than 30 seconds (seriously)
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The industry standard for API mocking in JavaScript.
- msw
- mock
- mocking-framework
- service-worker
HTTP server mocking and expectations library for Node.js
An email and SMTP testing tool with API for developers
- email-testing
- go
- golang
- smtp-server
Test Automation Made Simple
- test-automation
- assertions
- testing-tools
- mock-server
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
A tool for mocking HTTP services
- wiremock
- json
- mocking
- stubbing
Catches mail and serves it through a dream.
- smtp
- server
- ruby
Stub your network requests easily! Test your apps with fake network data and custom response time, response code and headers!
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
Easy Setup Stub Server
Papercut SMTP -- The Simple Desktop Email Server
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers
- api-simulation
- golang
- proxy
- mitm
The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀
Generate custom HTTP responses, the simpler way to test your Web Services
- scala
- mocky
- javascript
- mock
Get a full fake GraphQL API with zero coding in less than 30 seconds.
- graphql
- graphql-server
- express-graphql
A collection of utilities for creating/testing/experimenting with service workers.
- service-worker
JVM version of Pact. Enables consumer driven contract testing, providing a mock service and DSL for the consumer project, and interaction playback and verification for the service provider project.
- pact
- consumer-driven-contracts
- contract-testing
- hacktoberfest
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.
:heavy_check_mark: Mock data for your prototypes and demos. Remote deployments to Zeit now.
- atmo
- prototyping
- mock-services
- mock-server
Free, open-source AWS emulator. LocalStack alternative: 107 services, 7,657 operations, true 100% Smithy conformance (258,545/258,545 variants pass). No account, no auth token, no paid tier.
🐤Dynamically Mock server behaviors and responses in Swift
- func
- kakapo
- json-api
- opinionated
HTTP Server for Android Instrumentation tests