static void SerializeStringProperty(const std::string &key,
                                    const std::string &value, json &obj) {
  JsonAddMember(obj, key.c_str(), JsonFromString(value.c_str()));
}
static void SerializeStringProperty(const std::string &key,
                                    const std::string &value, json &obj) {
  JsonAddMember(obj, key.c_str(), JsonFromString(value.c_str()));
}