How to get all keys in object?

[recsater]

  std::string s = R"({"first":1,"second":2,"fourth":3,"fifth":4})";

  json j = json::parse(s);

and I want to retrieve all keys from object and treat them as a vector

which function should I use?

[recsater]

for (const auto& kv: j.object_range()) {
    loge("{}", kv.key());
  }

Thank you guys 👍