I haven't had the need to convert between different formats, only protobuf and a bit of Json. If I had too, I'd find python libraries akin to blackbox for each

I haven't had the need to convert between different formats, only protobuf and a bit of Json. If I had too, I'd find python libraries akin to blackbox for each of them and use a ptpython shell - but then I'm more of a CLI person.