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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.
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.