Converting Protocol Buffers Messages to and from JSON in Go

Internal

• Protocol Buffer Concepts

Overview

This example uses this message definition:

message SomeMessage {
  int32 id = 1;
  bool  is_valid = 2;
  string name = 3;
  repeated string sample_list = 4;
}

The Go code is generated following the instructions from:

Protocol Buffers Go Code Generation

To and From JSON

import (
	"fmt"
	"strings"

	"example.com/blue/pkg/somepkgpb"
	"github.com/golang/protobuf/jsonpb"
)

sm := &somepkgpb.SomeMessage{
	Id:         1,
	IsValid:    true,
	Name:       "something",
	SampleList: []string{"a", "b", "c"},
}

jsonMarshaler := &jsonpb.Marshaler{}
s, err := jsonMarshaler.MarshalToString(sm)
if err != nil { ... }
fmt.Printf("JSON representation: %s\n", s)

sm2 := &somepkgpb.SomeMessage{}
jsonUnmarshaler := &jsonpb.Unmarshaler{}
err = jsonUnmarshaler.Unmarshal(strings.NewReader(s), sm2)
if err != nil { ... }