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

using json_document = nlohmann::json_document;

int main()
{
    std::cout << std::boolalpha;

    // json_document is basic_json_document<nlohmann::json>: same value types
    // and containers as the ordinary json specialization
    json_document doc = json_document::parse(R"({"pi": 3.14, "numbers": [1, 2, 3]})");

    std::cout << doc.root().is_object() << '\n';
    std::cout << doc.root().materialize().dump() << '\n';
}