nlohmannjson/doc/examples/basic_json__basic_json.cpp

#include <iostream>
#include <nlohmann/json.hpp>

using json = nlohmann::json;

int main()
{
    // create a JSON array
    json j1 = {"one", "two", 3, 4.5, false};

    // create a copy
    json j2(j1);

    // serialize the JSON array
    std::cout << j1 << " = " << j2 << '\n';
    std::cout << std::boolalpha << (j1 == j2) << '\n';
}