IPhone : JSon Parsing Objective-c

I am developind an app where i want to extract value from json and display on screen. This is my json

(

    {
    clouds = 8;
    deg = 347;
    dt = 1427439600;
    humidity = 29;
    pressure = "959.5700000000001";
    speed = "1.61";
    temp =         {
        day = "35.07";
        eve = "33.93";
        max = "36.93";
        min = "25.96";
        morn = "35.07";
        night = "25.96";
    };
    weather =         (
                    {
            description = "sky is clear";
            icon = 02d;
            id = 800;
            main = Clear;
        }
    );
}

)

I want to extract description value from it. Can any one help me