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You can get the underlying map from the json object which gives you the array names and the arrays. If you just want to iterate through the items that's easy as well.

#include <iostream>
#include <json.hpp>
using json = nlohmann::json;
int main()
    json uuid = R"(
                    "uuid": ["aaa","bbb","ccc"],
                    "uuie": ["aaa","bbb","ccc"],
                    "uuif": ["aaa","bbb","ccc"]
              )"_json;
    if (uuid.is_object())
        auto obj = uuid.get<json::object_t>();
        for (auto& kvp : obj)
            std::cout << kvp.first << ":" << kvp.second << "\n";
    for (auto& item : uuid)
        std::cout << item << "\n";
    return 0;
        
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