You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <pageswithprop gpwpcontinue="2581" />
  </query-continue>
  <query>
    <pages>
      <page pageid="85" ns="0" title="Эс Класс Клиник Воронеж" contentmodel="wikitext" pagelanguage="ru" touched="2024-05-15T12:55:40Z" lastrevid="17526" counter="9891" length="4390" />
      <page pageid="89" ns="0" title="Эс Класс Клиник Саратов" contentmodel="wikitext" pagelanguage="ru" touched="2024-05-15T12:55:40Z" lastrevid="16621" counter="6539" length="3099" />
      <page pageid="92" ns="0" title="Эс Класс Клиник Ульяновск" contentmodel="wikitext" pagelanguage="ru" touched="2024-05-15T12:55:40Z" lastrevid="17583" counter="10167" length="3273" />
      <page pageid="93" ns="0" title="Эс Класс Клиник Тула" contentmodel="wikitext" pagelanguage="ru" touched="2024-05-15T12:55:40Z" lastrevid="18159" counter="10121" length="11917" />
      <page pageid="166" ns="10" title="Шаблон:Врачи" contentmodel="wikitext" pagelanguage="ru" touched="2015-09-28T11:04:13Z" lastrevid="14399" counter="2882" length="581" />
      <page pageid="701" ns="0" title="Widget:Iframe" contentmodel="wikitext" pagelanguage="ru" touched="2015-07-22T14:38:08Z" lastrevid="2252" counter="707" length="621" new="" />
      <page pageid="808" ns="0" title="Эс Класс Клиник Орёл" contentmodel="wikitext" pagelanguage="ru" touched="2024-05-15T12:55:40Z" lastrevid="17838" counter="7796" length="2812" />
      <page pageid="809" ns="0" title="Эс Класс Клиник Калуга" contentmodel="wikitext" pagelanguage="ru" touched="2024-05-15T12:55:40Z" lastrevid="18151" counter="9725" length="2966" />
      <page pageid="975" ns="10" title="Шаблон:Врачи Пластика" contentmodel="wikitext" pagelanguage="ru" touched="2017-02-17T12:14:10Z" lastrevid="17070" counter="1052" length="427" />
      <page pageid="1853" ns="0" title="Эс Класс Клиник Брянск" contentmodel="wikitext" pagelanguage="ru" touched="2024-05-15T12:55:40Z" lastrevid="17570" counter="8465" length="3812" />
    </pages>
  </query>
</api>