When comparing Negroni vs Go relax, the Slant community recommends Negroni for most people. In the question“What are the best web frameworks for Go?” Negroni is ranked 7th while Go relax is ranked 18th. The most important reason people chose Negroni is:
Negroni was developed as an alternative to Martini and Martini's "batteries included approach". You can choose which middlewares to include in your project. This way you get to choose what to have built-in.
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Pros
Pro Choose what features you want to have
Negroni was developed as an alternative to Martini and Martini's "batteries included approach". You can choose which middlewares to include in your project. This way you get to choose what to have built-in.
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.
Cons
Con No built in router
Negroni cannot really be considered a true web framework because it does not have a built-in router. You need to choose one of the many web routers already developed by the Go community and integrate it into your Negroni project.
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.