--- /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_integer = 12345678987654321u;
+ 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";
+ json j_binary = json::binary({1, 2, 3});
+
+ // call is_number_unsigned()
+ std::cout << std::boolalpha;
+ std::cout << j_null.is_number_unsigned() << '\n';
+ std::cout << j_boolean.is_number_unsigned() << '\n';
+ std::cout << j_number_integer.is_number_unsigned() << '\n';
+ std::cout << j_number_unsigned_integer.is_number_unsigned() << '\n';
+ std::cout << j_number_float.is_number_unsigned() << '\n';
+ std::cout << j_object.is_number_unsigned() << '\n';
+ std::cout << j_array.is_number_unsigned() << '\n';
+ std::cout << j_string.is_number_unsigned() << '\n';
+ std::cout << j_binary.is_number_unsigned() << '\n';
+}