If you use gogoproto, it includes an extension to the protobuf spec, to override json tag for the emitted Go. https://github.com/gogo/protobuf/blob/master/exten

If you use gogoproto, it includes an extension to the protobuf spec, to override json tag for the emitted Go. https://github.com/gogo/protobuf/blob/master/extensions.md https://github.com/gogo/protobuf/blob/master/extensions.md Use it like: import "github.com/gogo/protobuf/gogoproto/gogo.proto"; ... Type myField = 1 [(gogoproto.jsontag) = "my-field"];