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>
    <backlinks gblcontinue="0|Main_Page|5869" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1367" ns="12" title="Help:Contents" contentmodel="wikitext" pagelanguage="en" touched="2012-05-23T17:41:03Z" lastrevid="2698" counter="" length="2153" />
      <page pageid="1369" ns="4" title="BrewWiki:Site support" contentmodel="wikitext" pagelanguage="en" touched="2008-04-14T03:51:14Z" lastrevid="4560" counter="" length="1149" />
      <page pageid="1377" ns="2" title="User:BrewWiki" contentmodel="wikitext" pagelanguage="en" touched="2015-05-18T18:20:40Z" lastrevid="2116" counter="" length="1051" />
      <page pageid="1379" ns="4" title="BrewWiki:General disclaimer" contentmodel="wikitext" pagelanguage="en" touched="2006-07-01T22:47:41Z" lastrevid="2044" counter="" length="1117" />
      <page pageid="1420" ns="4" title="BrewWiki:Copyrights" contentmodel="wikitext" pagelanguage="en" touched="2006-07-16T17:07:15Z" lastrevid="2509" counter="" length="660" />
      <page pageid="1422" ns="14" title="Category:Portals" contentmodel="wikitext" pagelanguage="en" touched="2012-05-23T17:41:03Z" lastrevid="1833" counter="" length="399" />
      <page pageid="1444" ns="4" title="BrewWiki:Administrators" contentmodel="wikitext" pagelanguage="en" touched="2012-05-23T17:41:03Z" lastrevid="2441" counter="" length="491" />
      <page pageid="1449" ns="0" title="Donation Thanks" contentmodel="wikitext" pagelanguage="en" touched="2006-07-01T22:47:41Z" lastrevid="2052" counter="" length="483" />
      <page pageid="1450" ns="10" title="Template:Locked" contentmodel="wikitext" pagelanguage="en" touched="2006-07-01T22:50:06Z" lastrevid="2082" counter="" length="407" />
      <page pageid="1452" ns="4" title="BrewWiki:Protected page guidelines" contentmodel="wikitext" pagelanguage="en" touched="2006-07-01T22:47:41Z" lastrevid="2055" counter="" length="597" />
    </pages>
  </query>
</api>