Display json_encode array from ajax result

I have this result

{"policy":[{"id":"1","policy_name":"Policy 1","description":"Testing","status":"Active","valid_until":"2022-05-18","tags":"Test","active":"0","date_added":"2022-05-18 05:36:02"}]}

And I want to display the policy_name from the array and I’ve tried to alert it using this alert(response['policy'].policy_name); but I have an error.

43:4801 Uncaught TypeError: Cannot read properties of undefined (reading 'policy_name')

Updated
This is my whole code:

AJAX

$("*[id^='pol_action']").each(function() {
            $(this).change(function(){ 
                var value = $(this).val();
                var id = $('option:selected', this).attr('r-id');
               

                if($(this).val() == 'edit')
                {
                    $.ajax({
                        url: "<?php echo base_url();?>admin/leads/getPolData",
                        type: "POST",
                        data: {id: id},
                        success: function(response){
                            
                        $('#update_policy_modal').modal('show');
                            alert(response['policy'].policy_name);
                            console.log(response);
                        },
                            error: function(data){
                                console.log('error');
                            }
                    });
                }
                else if ($(this).val() == 'delete')
                {
                    
                }
            });
        }); 

Controller

public function getPolData()
    {
        $id = $this->input->post('id');
        
        $policy = $this->leads_model->getDataPol($id);
        $this->page_data['policy'] = $policy;

        echo json_encode($this->page_data);
    }

Model

public function getDataPol($id)
    {
        $where = array(
            'id'       => $id,
          );

        $this->db->select('*');
        $this->db->from('tblpolicies');
        $this->db->where($where);
        $query = $this->db->get();
        return $query->result();
    }

Can you help me with with this guys? Thank you in advance.

>Solution :

You can try adding dataType: "JSON" so you don’t have to parse JSON, like below. Then you can try to loop through the array of data:

$.ajax({
   url: ...,
   type: "POST",
   data: {id:id},
   dataType: "JSON"
   success: function(data){
      $.each(data, function(key, value){
          alert(value.policy_name);
      });
   }
});