using System;

using System.Text;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        byte[] bytes = Encoding.UTF8.GetBytes("This is a test");

        string json = JsonConvert.SerializeObject(bytes);

        Console.WriteLine(json);

        bytes = JsonConvert.DeserializeObject<byte[]>(json);

        Console.WriteLine(Encoding.UTF8.GetString(bytes));

    }

}