using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        var json = "[{ \"firstName\": \"test\", \"middleName\": \"test\", \"lastName\": \"test\" }, { \"addresses\": [{ \"street\": \"test\", \"city\": \"test\", \"state\": \"test\", \"zip\": \"test\" }] }, { \"DOB\": \"\" }, { \"SSN\": \"123123123\" }, { \"occupation\": \"test\", \"typeOfOccupation\": \"test\" }, { \"phones\": [{ \"phone\": \"\", \"type\": \"\" }] }, { \"Email\": \"\" }, { \"typeOfId\": \"\", \"idNumber\": \"\", \"expirationDate\": \"\" }]";

        var data = JArray.Parse(json);

        JToken ssn = data.SelectToken("$..SSN");

        if(ssn!=null){

            Console.WriteLine(ssn.Value<string>());

        }

    }

}