.NET Fiddle

CSharp · Console

/Program.cs

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();
				}
		}
	}


}