How do you get a JSON object from a string in nlohmann json?
Adding _json to a string literal instructs the compiler to interpret it as a JSON literal instead.
Obviously, a JSON object can equal a JSON value, but a string cannot.
In this cases, you have to remove _json from the literal, but that makes second a string value hiding inside a JSON object.
So, you also use json::parse, like this:
std::string s = "[\"nlohmann\", \"json\"]";json second = json::parse(s);