Some of us ran into problem when it came to converting a std::string or a const char* string properly to json object by nlohmann (https://github.com/nlohmann/json).
Here is how I achieved it :

#include <string>#include <iostream>>#include <sstream>#include "json.hpp"using namespace nlohmann;json toJson(const char* jsonString){    json jsonObj;    std::stringstream(jsonString) >> jsonObj;    return jsonObj;}