using System;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string str = "[1,2]";

        var jtoken = JToken.Parse(str);

        Console.WriteLine(jtoken);

        JObject json = JsonConvert.DeserializeObject<JObject>(str);

        Console.WriteLine(json);

    }

}