using System;

using System.Collections.Generic;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

        var json = @"{""0"":""john"",""1"":""JOHN""}";

        var dictionary = JsonConvert.DeserializeObject<Dictionary<int, string>>(json);

        Console.WriteLine("0 = " + dictionary[0]);

        Console.WriteLine("1 = " + dictionary[1]);

    }

}