using System;

using System.IO;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string json = "{ \"Id\":123456, \"Content\":\"Seu json vai aqui...\"}";

        string formatted = JsonFormatting.Ident(json);

        Console.WriteLine(formatted);

    }

    public class JsonFormatting

    {

        public static string Ident(string json)

        {

            using (var sr = new StringReader(json))

                using (var sw = new StringWriter())

                {

                    var jr = new JsonTextReader(sr);

                    var jw = new JsonTextWriter(sw) { Formatting = Formatting.Indented };

                    jw.WriteToken(jr);

                    return sw.ToString();

                }

        }

    }

​

​

}