| 1234567891011121314151617181920 | #include <iostream>#include <nlohmann/json.hpp>using json = nlohmann::json;int main(){    try    {        // calling at() for a non-existing key        json j = {{"foo", "bar"}};        json k = j.at("non-existing");    }    catch (json::exception& e)    {        // output exception information        std::cout << "message: " << e.what() << '\n'                  << "exception id: " << e.id << std::endl;    }}
 |