how can i access this data from my ajax to my controller - ajax

Question

$('#loginForm').attr('action', '<?php echo base_url(); ?>index.php/login/identifying_usertype');
var url = $('#signinForm').attr('action');
var email = $('#loginEmail').val();
var password = $('#loginPass').val();
var postData = {
'email' : email,
'password' : password
};
$.ajax({
type: "POST",
url : url,
data : postData,
success: function(response){
alert(data);
},
error: function (XHR, status, error){
console.log('error', error);
}
});
I have an error on my console it says Uncaught ReferenceError: data is not defined. when my data is on postData array what could be the problem on this one how can i access this data on my controller

Answer 1

This doesn't have anything to do with a controller or any of your server-side code. You simply have a function where you're trying to use a variable that doesn't exist:
function(response){
alert(data);
}
The data variable isn't defined anywhere. If you're examining the response, then surely you meant to alert the response variable instead?:
function(response){
alert(response);
}
Of course, if response is anything more than a primitive value then this may not show useful results. Conversely, you can log response to the console and see more information about it in your browser's debugging console:
function(response){
console.log(response);
}

Answer 2

You can acccess POST data in CodeIgniter using this syntax
$vairable_name = $this->input->post('VARIABLE_NAME');
echo $variable_name;
exit;