WireMock is a simulator for HTTP-based APIs. Some might consider it a service virtualization tool or a mock server.
Cost / License
- Free
- Open Source (Apache-2.0)
Platforms
- Mac
- Windows
- Linux
apimock-rs (API Mock) is a developer-friendly, super-lightweight and functional HTTP(S) mock server built in Rust. It provides file-based mechanism for mocking RESTful APIs using static JSON responses. Optionally, dynamic routing is supported: rule-based matching via toml and...
Cost / License
- Free
- Open Source (Apache-2.0)
Platforms
- Mac
- Windows
- Linux
- BSD
- Self-Hosted

MockServer can be used for mocking any system you integrate with via HTTP or HTTPS (i.e. services, web sites, etc).
Cost / License
- Free
- Open Source (Apache-2.0)
Platforms
- Mac
- Windows
- Linux
Build your Application or Frontend even if API is still in development or you don't have access to Third Party API yet.
Cost / License
- Free
- Proprietary
Platforms
- Online
- Software as a Service (SaaS)
Cost / License
- Freemium
- Proprietary
Platforms
- Online


+1
Online API Mocking Tool: API Mock, fake API, stub API, simulate API, dummy API. Capture and debug requests instantly. Forward requests to localhost for webhooks testing and debugging. More than 100 random or faker shortcodes for response templating.
Cost / License
- Freemium
- Proprietary
Platforms
- Online
- Software as a Service (SaaS)



The subscription API to generate fake sample data for convincing mockups. Use FakeJSON's data to test your ideas, populate your wireframes or showcase your designs
Cost / License
- Paid
- Proprietary
Platforms
- Online



API Mocha is a free tool enabling you to build and mock APIs in seconds. Quickly prototype APIs for application development and integration. Customize API response data, HTTP status codes and add transaction delay.
Cost / License
- Free
- Proprietary
Platforms
- Online

SmartMock.io is a tool to set up, manage, and troubleshoot HTTP protocol API mocks (REST, SOAP, JSON-RPC) in the cloud. This frees you up to focus on the logic of your mocks and not have to think about boilerplate code of your own HTTP mock servers.
Cost / License
- Freemium
- Proprietary
Platforms
- Online
- Software as a Service (SaaS)


+1
It's hard to put together a meaningful UI prototype without making real requests to an API. By making real requests, you'll uncover problems with application flow, timing, and API design early, improving the quality of both the user experience and API.
Cost / License
- Freemium
- Proprietary
Platforms
- Online

Proxy your API, choose which endpoints to mock in the cloud and inspect traffic, for free. Speed up your development and integrations tests.
Cost / License
- Free
- Open Source
Platforms
- Online
- Self-Hosted
- Software as a Service (SaaS)
Writing unit tests can be hard and sometimes good design has to be sacrificed for the sole purpose of testability. Often testability corresponds to good design, but this is not always the case. For example final classes and methods cannot be used, private methods sometimes need...
Cost / License
- Free
- Open Source (Apache-2.0)
Platforms
- Mac
- Windows
- Linux
- Java











































