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>
    <alllinks galcontinue="Geo_microformat|8" />
  </query-continue>
  <query>
    <pages>
      <page pageid="124" ns="0" title="JSON Permission Editing" />
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="96" ns="0" title="Nuget Package Repository" />
      <page pageid="4" ns="0" title="Order Express" />
      <page pageid="102" ns="0" title="Order Express Formulas" />
      <page pageid="5" ns="0" title="Smart Spec" />
      <page pageid="8" ns="8" title="MediaWiki:Common.css" />
      <page pageid="93" ns="14" title="Category:Order Express" />
    </pages>
  </query>
</api>