protobuf

message UserInfo{
    bool IsAuth = 1;
    string Name = 2;
}

---

there is a better solution.
the file generated by proto is still best not to modify it, it is reasonable to exist.
you can take a look at this.

var pbMarshaler jsonpb.Marshaler

func init() {
    pbMarshaler = jsonpb.Marshaler{
        EmitDefaults: true,
        OrigName:     true,
        EnumsAsInts:  true,
    }
}

there is a Marshal method to read the pb object to buffer, and the rest is buffer.Bytes ().
this method is very convenient and is recommended.

---

type Req struct {
    Type       int32  `protobuf:"varint,5,opt,name=type" json:"type,omitempty"`
}

Delete the omitempty of the generated pb.go file

type Req struct {
    Type       int32  `protobuf:"varint,5,opt,name=type" json:"type"`
}

so OK

---

cannot be achieved directly in the proto protocol definition file

---

solve your problem in a word.

 Google.Protobuf.JsonFormatter.Settings.Default.WithFormatDefaultValues(true);

The value false or true in

represents whether to generate a serialized string for the default value. By default, no serialization string is generated.

---

18 years' question, but if you see it, give a simple answer. This problem occurs because protoc generates code that adds omitempty to json tag , so we use protoc-go-inject-tag .

< H2 > install < / H2 >

go get -u github.com/favadi/protoc-go-inject-tag

< H2 > use < / H2 >

message UserInfo{
    // @inject_tag: json:"is_auth"
    bool IsAuth = 1;
    // @inject_tag: json:"name"
    string Name = 2;
}

generate pb files using protoc

protoc --go_out=. user.proto

run protoc-go-inject-tag

protoc-go-inject-tag -input=./user.pb.go

similarly, you can also use other tag if you want to change it.