JSON（C++）

std::string JsonToString(const Json::Value & root)
{
  static Json::Value def = []() {
    Json::Value def;
    Json::StreamWriterBuilder::setDefaults(&def);
    def["emitUTF8"] = true;
    return def;
  }();
 
  std::ostringstream stream;
  Json::StreamWriterBuilder stream_builder;
  stream_builder.settings_ = def;//Config emitUTF8
  std::unique_ptr<Json::StreamWriter> writer(stream_builder.newStreamWriter());
  writer->write(root, &stream);
  return stream.str();
}