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nlohmannjson/doc/examples/is_null.cpp

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#include <iostream>
#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
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json j_number_unsigned_integer = 12345678987654321u;
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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 is_null()
std::cout << std::boolalpha;
std::cout << j_null.is_null() << '\n';
std::cout << j_boolean.is_null() << '\n';
std::cout << j_number_integer.is_null() << '\n';
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std::cout << j_number_unsigned_integer.is_null() << '\n';
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std::cout << j_number_float.is_null() << '\n';
std::cout << j_object.is_null() << '\n';
std::cout << j_array.is_null() << '\n';
std::cout << j_string.is_null() << '\n';
}