// setting json string
std::string json = "{\"num\":10,\"rno\":23.5,\"aoa\":[[1,2],[3]],\"str\":\"john\",\
\"object\":{\"bl1\":false,\"ar\":[2,3]}, \"objects\":[{\"bl2\":true,\"nl\":null},{\"ar1\":[1,2]}]}";
// setting json string
std::string json = "{\"num\":10,\"rno\":23.5,\"aoa\":[[1,2],[3]],\"str\":\"john\",\
\"object\":{\"bl1\":false,\"ar\":[2,3]}, \"objects\":[{\"bl2\":true,\"nl\":null},{\"ar1\":[1,2]}]}";