[goccy]

I think it depends on the application. In many cases, encoding/json is fast enough and stable, but I think you can try to use a faster library if JSON encoding / decoding is performance critical on your application.

[0x008]

Or you could try something like Apache Arrow or Flexbuffers?

[jerf]

If you write off the "JSON", sure, there's a bajillion options. But that's not always possible or desirable. None of those bajillion options have the combination of support and mindshare that JSON has obtained, for better or worse.