yeah they're used a lot. I think the difference is json is good for data or apis you want to be easily shared, flatbuffers (or protobuf or captnproto) are good

yeah they're used a lot. I think the difference is json is good for data or apis you want to be easily shared, flatbuffers (or protobuf or captnproto) are good for data that stays internal. That's just a guideline and there are plenty of exceptions but it's a starting point to thinking about it.