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="29388" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Заглавная страница" contentmodel="wikitext" pagelanguage="ru" touched="2022-04-29T07:59:37Z" lastrevid="59505" counter="963214" length="6635" />
      <page pageid="582" ns="0" title="Дело Поносова" contentmodel="wikitext" pagelanguage="ru" touched="2016-04-21T19:23:42Z" lastrevid="14597" counter="1648" length="17849" />
      <page pageid="2650" ns="0" title="Аккерман" contentmodel="wikitext" pagelanguage="ru" touched="2016-08-14T13:40:21Z" lastrevid="41804" counter="2941" length="5302" />
      <page pageid="4161" ns="14" title="Категория:МСЭ" contentmodel="wikitext" pagelanguage="ru" touched="2022-09-06T07:58:27Z" lastrevid="52354" counter="128553" length="305" />
      <page pageid="4162" ns="14" title="Категория:БЭСБЕ" contentmodel="wikitext" pagelanguage="ru" touched="2023-05-22T09:24:14Z" lastrevid="49904" counter="236655" length="969" />
      <page pageid="6049" ns="14" title="Категория:БСЭ" contentmodel="wikitext" pagelanguage="ru" touched="2022-12-15T08:22:38Z" lastrevid="26822" counter="93103" length="206" />
      <page pageid="7705" ns="4" title="ЭНЭ:Администраторы" contentmodel="wikitext" pagelanguage="ru" touched="2017-03-18T21:00:17Z" lastrevid="54048" counter="12547" length="8068" />
      <page pageid="15777" ns="10" title="Шаблон:Индекс категории АБВ" contentmodel="wikitext" pagelanguage="ru" touched="2009-08-18T21:26:42Z" lastrevid="26817" counter="3862" length="2186" new="" />
      <page pageid="15779" ns="10" title="Шаблон:Индекс категории АБВ (удобный)" contentmodel="wikitext" pagelanguage="ru" touched="2009-08-18T21:32:44Z" lastrevid="26819" counter="2780" length="3125" new="" />
      <page pageid="16796" ns="14" title="Категория:НЭС" contentmodel="wikitext" pagelanguage="ru" touched="2012-05-28T08:21:25Z" lastrevid="28673" counter="4148" length="720" new="" />
    </pages>
  </query>
</api>