When comparing Go relax vs Martini, the Slant community recommends Martini for most people. In the question“What are the best web frameworks for Go?” Martini is ranked 8th while Go relax is ranked 18th. The most important reason people chose Martini is:
A lot of effort has been put into making the documentation as clear and helpful as possible. And it shows. The documentation is thorough and complete. Every part of the framework is explained in a way that's clear and understandable.
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Pros
Pro Good for building REST APIs
Go Relax is a pretty minimalistic framework. Only the most essential features and libraries are included. Making it a great framework for developing high-performance REST APIs.
Pro Well documented
A lot of effort has been put into making the documentation as clear and helpful as possible. And it shows.
The documentation is thorough and complete. Every part of the framework is explained in a way that's clear and understandable.
Pro No unneccessary cruft
Martini is a very minimal framework. It only comes packed with the most essential features and libraries needed to develop a web application. If you need more features, you can install third party libraries. This way you only use what you need.
Pro Flexible routing
Martini's routing is flexible and DRY. It supports parameters, wildcards and regex.
Cons
Con Might not be suitable for large backend applications
Go Relax is great for building a REST API for the backend if you want to develop a SPA using a frontend framework for example. But for anything that requires more features on the server side, it would be better to use a more "batteries included" framework.
Con No longer maintained
Martini is no longer being actively maintained.