How to disable xdebug in PHP?

Question

PHP

When sending an AJAX request, the server returns text with Xdevug styles, so js cannot parse this and an error pops up. How to disable xdebug for a given script?
php:

header('Content-Type: application/json');
return json_encode(1);

js(fragment)

$.ajax({
      url: '/ajax.php',
      method: 'post',
      dataType: 'json',
      data: {type: 'test'},
      success: function(data) {
        console.log(data);
        console.log('OK');
      },