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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>
    <allcategories gaccontinue="Lists_of_Olympic_flag_bearers_by_country" />
  </query-continue>
  <query>
    <pages>
      <page ns="14" title="Category:List of Intangible Cultural Heritage in Need of Urgent Safeguarding" missing="" contentmodel="wikitext" pagelanguage="en" />
      <page ns="14" title="Category:Lists and galleries of flags" missing="" contentmodel="wikitext" pagelanguage="en" />
      <page ns="14" title="Category:Lists by country" missing="" contentmodel="wikitext" pagelanguage="en" />
      <page ns="14" title="Category:Lists of 2014 films by country or language" missing="" contentmodel="wikitext" pagelanguage="en" />
      <page ns="14" title="Category:Lists of American people by ethnic or national origin" missing="" contentmodel="wikitext" pagelanguage="en" />
      <page ns="14" title="Category:Lists of Asian rulers" missing="" contentmodel="wikitext" pagelanguage="en" />
      <page ns="14" title="Category:Lists of Guantanamo Bay detainees by nationality" missing="" contentmodel="wikitext" pagelanguage="en" />
      <page ns="14" title="Category:Lists of Korean people" missing="" contentmodel="wikitext" pagelanguage="en" />
      <page pageid="3064" ns="14" title="Category:Lists of Kazakhstani media" contentmodel="wikitext" pagelanguage="en" touched="2017-04-27T17:01:03Z" lastrevid="6124" counter="345" length="165" />
      <page pageid="7927" ns="14" title="Category:Lists of Kazakhstani people" contentmodel="wikitext" pagelanguage="en" touched="2017-04-27T19:37:35Z" lastrevid="15882" counter="506" length="160" />
    </pages>
  </query>
</api>