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="2253" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2097" ns="0" title="Extensions" contentmodel="wikitext" pagelanguage="en" touched="2021-09-15T12:38:44Z" lastrevid="247903" counter="" length="3958" />
      <page pageid="2165" ns="0" title="FR" contentmodel="wikitext" pagelanguage="en" touched="2021-05-16T14:59:30Z" lastrevid="232352" counter="" length="2252" />
      <page pageid="2200" ns="0" title="PL/NLC" contentmodel="wikitext" pagelanguage="en" touched="2012-01-20T19:44:25Z" lastrevid="82920" counter="" length="4157" />
      <page pageid="2206" ns="0" title="PL/Baza wiedzy użytkownika" contentmodel="wikitext" pagelanguage="en" touched="2012-01-20T19:43:27Z" lastrevid="159668" counter="" length="1411" />
      <page pageid="2214" ns="0" title="PL/Przygotuj miejsce pracy" contentmodel="wikitext" pagelanguage="en" touched="2012-01-20T19:43:14Z" lastrevid="159679" counter="" length="22585" />
      <page pageid="2215" ns="0" title="PL/Tworzenie nowego dokumentu tekstowego" contentmodel="wikitext" pagelanguage="en" touched="2012-01-20T19:43:44Z" lastrevid="159683" counter="" length="1296" />
      <page pageid="2222" ns="0" title="PL/Kompatybilność czcionek" contentmodel="wikitext" pagelanguage="en" touched="2012-01-20T19:43:44Z" lastrevid="159673" counter="" length="1731" />
      <page pageid="2226" ns="0" title="PL/Otwieranie istniejącego dokumentu tekstowego" contentmodel="wikitext" pagelanguage="en" touched="2012-01-20T19:43:44Z" lastrevid="159676" counter="" length="2717" />
      <page pageid="2229" ns="0" title="PL/Formatowanie strony" contentmodel="wikitext" pagelanguage="en" touched="2012-01-20T19:43:44Z" lastrevid="159670" counter="" length="4136" />
      <page pageid="2234" ns="0" title="PL/Klawisze Writera" contentmodel="wikitext" pagelanguage="en" touched="2012-01-20T19:43:44Z" lastrevid="159672" counter="" length="6574" />
    </pages>
  </query>
</api>