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="30" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4" ns="0" title="Sound/Arrange" contentmodel="wikitext" pagelanguage="ja" touched="2022-12-20T15:13:07Z" lastrevid="770" counter="139362" length="18395" />
      <page pageid="19" ns="0" title="メインページ" contentmodel="wikitext" pagelanguage="ja" touched="2020-02-22T17:50:34Z" lastrevid="759" counter="287290" length="3514" />
      <page pageid="20" ns="0" title="コミックマーケットC78" contentmodel="wikitext" pagelanguage="ja" touched="2012-01-07T18:11:31Z" lastrevid="186" counter="12039" length="4016" />
      <page pageid="22" ns="0" title="コミックマーケットC79" contentmodel="wikitext" pagelanguage="ja" touched="2012-01-07T18:11:23Z" lastrevid="188" counter="16706" length="7124" />
      <page pageid="23" ns="0" title="スピラの情景 -return to our souls-" contentmodel="wikitext" pagelanguage="ja" touched="2013-06-25T16:05:34Z" lastrevid="558" counter="13967" length="3758" />
      <page pageid="24" ns="0" title="Overworld -Last Running-" contentmodel="wikitext" pagelanguage="ja" touched="2012-01-12T16:19:50Z" lastrevid="427" counter="8805" length="863" />
      <page pageid="25" ns="0" title="Prophecy in celestia" contentmodel="wikitext" pagelanguage="ja" touched="2012-01-12T16:20:36Z" lastrevid="428" counter="11342" length="953" />
      <page pageid="27" ns="14" title="カテゴリ:天地創造" contentmodel="wikitext" pagelanguage="ja" touched="2015-10-21T11:34:32Z" lastrevid="173" counter="3552" length="52" new="" />
      <page pageid="28" ns="14" title="カテゴリ:聖剣伝説2" contentmodel="wikitext" pagelanguage="ja" touched="2014-04-26T18:51:24Z" lastrevid="258" counter="4728" length="56" />
      <page pageid="29" ns="14" title="カテゴリ:FINAL FANTASY 10" contentmodel="wikitext" pagelanguage="ja" touched="2012-01-07T18:13:47Z" lastrevid="176" counter="3486" length="66" new="" />
    </pages>
  </query>
</api>