Parse JSON from JQuery.ajax success data

The data is coming back as the string representation of the JSON and you aren't converting it back to a JavaScript object. Set the dataType to just 'json' to have it converted automatically.

I recommend you use:

var returnedData = JSON.parse(response);

to convert the JSON string (if it is just text) to a JavaScript object.

It works fine, Ex :

$.ajax({
    url: "http://localhost:11141/Search/BasicSearchContent?ContentTitle=" + "تهران",
    type: 'GET',
    cache: false,
    success: function(result) {
        //  alert(jQuery.dataType);
        if (result) {
            //  var dd = JSON.parse(result);
            alert(result[0].Id)
        }

    },
    error: function() {
        alert("No");
    }
});

Finally, you need to use this statement ...

result[0].Whatever