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>
    <pages>
      <page ns="0" title="Channel Switch2" missing="" />
      <page ns="0" title="Create ServerQuery Login" missing="" />
      <page ns="0" title="Hoster API" missing="" />
      <page ns="0" title="Schiftzeichen Falsch Youtube" missing="" />
      <page ns="0" title="TS3MusicBot installieren" missing="" />
      <page ns="0" title="Welche Webinterfaces Laufen mit dem TS3Musicbot" missing="" />
      <page pageid="266" ns="0" title="Hoster API EN" />
      <page pageid="254" ns="0" title="TS3MusicBot API" />
    </pages>
  </query>
</api>