I think most people who use JSON don't want strong typing or to use schemas. If you do, you just use a different serialization format: JSON is designed to be a generic, human-readable way to basically represent any kind of data structure (since it deserializes to JS objects). So everything about JSON is working against you if you do try to enforce type/schemas on it.
A grpc-like protocol with more prescriptive type registries/discovery (over the network) and better interop with http (like grpc-gateway) would be the best approach IMO. Definitely not JSON schema
I have been using serde without issues, and never resorted to `serde::Value`[0], the untyped option, so far.
I have yet to experience anything working against me.
[0]: https://docs.rs/serde_json/latest/serde_json/enum.Value.html
We use JSON because it's standard, human-readable, mostly self-described and works natively with Javascript.
You can read JSON object without having to know the schema even if one exists.
Protobuf is unusablr garbage without a lot of supporting tooling.
Not necessarily. It's biggest advantage is probably that it has very good interoperability. Basically every language has a readily accessible library for json, and even if you don't, it isn't that hard to write a parser and/or generator for it. And being human readable isn't something to sneeze at either.