Proto3 JSON is there a MessageToJsonString method

[Chad Beaulac]

I can't find how to serialize a message directly to JSON. It seems that you have to serialize it to binary first and them to JSON and the same going in the reverse direction.

To serialize a message to JSON I have to serialize it to binary and then output the binary to a string like this

  std::string serialized = startMovie.SerializeAsString(); // startMovie is a google::protobuf::Message

  std::string json_string;

  

  // Create a TypeResolver used to resolve protobuf message types

  google::protobuf::util::JsonOptions options;

  options.always_print_primitive_fields = true;

  std::unique_ptr<google::protobuf::util::TypeResolver> resolver(google::protobuf::util::NewTypeResolverForDescriptorPool(

    "type.googleapis.com", google::protobuf::DescriptorPool::generated_pool())); 

  

  auto status = google::protobuf::util::BinaryToJsonString(resolver.get(), "type.googleapis.com/movie.pbuf.Movie", serialized, &json_string, options);

   std::cout << "*******\n" << json_string << std::endl;

But what I really want to do is

std::string json_string = google::protobuf::util::MessageToJsonString(startMove); // startMovie is a google::protobuf::Message

And parsing from a JSON string to a Message is a two-step process also like

  // Turn JSON into serialized protobuf message

  std::string movieBin;

  google::protobuf::util::JsonToBinaryString(resolver.get(), "type.googleapis.com/movie.pbuf.Movie", json_string, &movieBin);  

  

  Movie startMovie2;

  startMovie2.ParseFromString(movieBin);

But what I really want to do is

Movie startMovie2 = google::protobuf::util::JsonToMessage("type.googleapis.com/movie.pbuf.Movie", json_string);

Maybe this exists and I just haven't found it yet?

Thanks,

Chad

[Feng Xiao]

Sorry, we definitely should add these methods for convenience but just don't get time for it yet. Could you help file a github issue? Or better help us add these two methods?

 

Thanks,

Chad

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[Chad Beaulac]

Hi Feng,

I just wrote this Github issue: https://github.com/google/protobuf/issues/1690

I'll look into doing it too.

-Chad