javascript - Unrecognised Json object -

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i creating simple app user clicks on button , json object returned database. structure of object shown bellow. however, object not recognized , execution failing. ideas why happening?

response array php passed js

array(2) (   [success] => (bool) true   [cnt] => array(2) (     [2014-11-28] => array(2) (       [visits] => (string) 1115       [searches] => null     )     [2014-11-29] => array(2) (       [visits] => (string) 493       [searches] => 0     )      ) )

json object

{    "success":true,    "cnt":{       "2014-11-28":{          "visits":"1115",          "searches":null       },       "2014-11-29":{          "visits":"493",          "searches":0       }    } }

function parsing object

 $.post(jobk.ajaxurl, data, function (resp) {             if (resp.success) {                  // append rows                     $.each(resp.cnt, function (datecol) {                     $.each(datecol, function (visitscol, searchescol) {                         // insert row in table @ row index 0                         var newrow = tableref.insertrow(tableref.rows.length);                      });                 });             }          }, 'json');     });

first of need return valid json string

{"success": true, "cnt": {"2014-11-28": {"visits": "1115", "searches": null}, "2014-11-29": {"visits": "493", "searches": 0}}}

also think not need second loop, 1 =>

// append rows     $.each(resp.cnt, function (datecol, date) {    var visits = datecol.visits;    var searches = datecol.visits;    //... here });

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