--- /dev/null
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+ // create JSON values
+ json j_null;
+ json j_boolean = true;
+ json j_number_integer = -17;
+ json j_number_unsigned = 42u;
+ json j_number_float = 23.42;
+ json j_object = {{"one", 1}, {"two", 2}};
+ json j_array = {1, 2, 4, 8, 16};
+ json j_string = "Hello, world";
+
+ // call operator value_t()
+ json::value_t t_null = j_null;
+ json::value_t t_boolean = j_boolean;
+ json::value_t t_number_integer = j_number_integer;
+ json::value_t t_number_unsigned = j_number_unsigned;
+ json::value_t t_number_float = j_number_float;
+ json::value_t t_object = j_object;
+ json::value_t t_array = j_array;
+ json::value_t t_string = j_string;
+
+ // print types
+ std::cout << std::boolalpha;
+ std::cout << (t_null == json::value_t::null) << '\n';
+ std::cout << (t_boolean == json::value_t::boolean) << '\n';
+ std::cout << (t_number_integer == json::value_t::number_integer) << '\n';
+ std::cout << (t_number_unsigned == json::value_t::number_unsigned) << '\n';
+ std::cout << (t_number_float == json::value_t::number_float) << '\n';
+ std::cout << (t_object == json::value_t::object) << '\n';
+ std::cout << (t_array == json::value_t::array) << '\n';
+ std::cout << (t_string == json::value_t::string) << '\n';
+}