laravel ajax form and checkbox

Hi I have a form in laravel with a checkbox inside, i send datas via ajax This is my html

      <div class="custom-control custom-switch">
        <input type="checkbox" class="custom-control-input" id="customSwitch1" name="customSwitch1">
        <label class="custom-control-label" for="customSwitch1">Cartaceo</label>
      </div>

i cannot understand why the checkbox is sending always ON...I need to manage on/off with javascript? Thx a lot