The buf CLI can do this. Here's how it looks to convert from encoded protobuf to json (protojson). buf convert schema.proto \ --type YourMessageName \

The buf CLI can do this. Here's how it looks to convert from encoded protobuf to json (protojson). buf convert schema.proto \ --type YourMessageName \ --from payload.binpb \ --to output.json And just invert the arguments to convert back. buf convert schema.proto \ --type YourMessageName \ --from data.json \ --to encoded.binpb