value undefined while decoding json with jquery -

I know there are already many questions related to this subject, but I have tried many of them but I am still Also unable to get the value

I am using Reebok and I am getting the right response: -

  [{"id": 4, "comments": 1, "likes" : 5, "books": 3, "name": "steve"}]   
 but I'm not able to display them on the page. When I try to alert (data. Id) then I get undefined in the warning box. Here's my code: -  
  $ Ajax ({type: "GET", url: "getdata.php", data: datestring, datatype: "Jason", success: function (data) {warning (data.id);}});   
 I tried  
  $ Each (data, function (key, element) {warning (key); alert (element);});   
 This key shows as 0, but in the warning box as the object [object object]   
 
 
 That's because your feedback is an array.  
 Either  
  success: function (data) {warning (data [0] .id); }   
 or only one object return  
  {"id": 4, "comments": 1, "likes": 5, "books": 3, "name": "steve"}   
 or if you want to use an  each  array like  
  $ Each (data, function (key, element) {warning (key); alert (element.id); alerts (element.comments); alerts (element.likes); ...});