Return as "Json Object" instead of a "string".

I want to know how to return json1 as a "Json Object" instead of a "string".

 [WebMethod]
        public static string getJson()
        {
             ...
            var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
            var json1 = serializer.Serialize(gvlist).ToString();
            return json1;
        }