using System;

using System.Linq;

using System.Data;

using Newtonsoft.Json.Linq;

​

public class Program

{

    public static void Main()

    {

        var arrOfObj = JArray.Parse(GetJson);

        foreach (JObject ob in arrOfObj)

        {

            var key = ob.Properties().Select(p => new { KEY = p.Name, VAL = p.Values().FirstOrDefault()}).FirstOrDefault();

            Console.WriteLine(key);

        }

    }

    internal static string GetJson => 

         @"[

   { ""JSONFOO_123123"":""SOME JSON""},

   { ""JSONFOO_BAR"":""Other JSON""}

]

";

}