1 #include <iostream> 2 #include <iomanip> 3 #include <nlohmann/json.hpp> 4 5 using json = nlohmann::json; 6 main()7int main() 8 { 9 // create two JSON objects 10 json o1 = R"( {"color": "red", "price": 17.99} )"_json; 11 json o2 = R"( {"color": "blue", "speed": 100} )"_json; 12 13 // add all keys from o2 to o1 (updating "color") 14 o1.update(o2.begin(), o2.end()); 15 16 // output updated object o1 17 std::cout << std::setw(2) << o1 << '\n'; 18 } 19