Analyzing quick guides I was able to understand how to set up the protocol buffers to send/receive objects already known by client and server.
My doubt is how to send or receive an entire JSON file, even when I dont know its properties and types. There's a way to do that?
On the proto3 documentation theres no such type as "JSON".
I believe the "Any" type is what you are looking for. Also look into mapping, and JSON mapping. It is there in the documentation you posted.
The google.protobuf.Struct type is the common solution for representing arbitrary JSON structures in Protobuf. It uses a map field to support arbitrary field names, and the google.protobuf.Value type uses a oneof field to support arbitrary value types, including nested Struct values.
