using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        Test(JToken.Parse("{}")); // empty object

        Test(JToken.Parse("[]")); // empty array

        Test(JToken.Parse("\"\"")); // empty string

        Test(JToken.Parse("null")); // null value

    }

    private static void Test(JToken token)

    {

        Console.WriteLine("Type: " + token.Type.ToString());

        Console.WriteLine("Token: " + token.ToString());

        Console.WriteLine("IsEmpty1: " + token.IsNullOrEmpty().ToString());

        Console.WriteLine("IsEmpty2: " + token.IsNullOrEmpty2().ToString());

        Console.WriteLine();

    }

}

​

public static class JsonHelper

{

    public static bool IsNullOrEmpty(this JToken token)

    {

        return (token == null) ||

               (token.Type == JTokenType.Array && !token.HasValues) ||

               (token.Type == JTokenType.Object && !token.HasValues) ||

               (token.Type == JTokenType.String && token.ToString() == String.Empty) ||

               (token.Type == JTokenType.Null);

    }

​

    public static bool IsNullOrEmpty2(this JToken token)

    {

        return token == null || string.IsNullOrWhiteSpace(token.ToString());

    }

}