using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        ParseAndProcess("First run", @"{ ""nested"": ""foo"" }");

        ParseAndProcess("Second run", @"{ ""nested"": null }");

        ParseAndProcess("Third run", @"{ }");

    }

    private static void ParseAndProcess(string comment, string json)

    {

        Console.WriteLine("--- " + comment + " ---");

        JToken root = JToken.Parse(json);

​

        JToken nested = root["nested"];

        if (nested != null)

        {

            if (nested.Type == JTokenType.Null)

            {

                Console.WriteLine("nested is set to null");

            }

            else

            {

                Console.WriteLine("nested has a value: " + nested.ToString());

            }

        }

        else

        {

            Console.WriteLine("nested does not exist");

        }

        Console.WriteLine();

    }

}

​

​