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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.
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<?xml version="1.0"?>
<api>
  <query>
    <pages>
      <page ns="0" title="API" missing="" />
      <page pageid="1" ns="0" title="Main Page">
        <revisions>
          <rev user="Vipul" timestamp="2019-01-02T13:48:13Z" comment="" contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">{{DISPLAYTITLE:The Subject Wikis Reference Guide}}
To see more up-to-date and regularly updated pageview counts for the subwiki sites, see [https://analytics.vipulnaik.com analytics.vipulnaik.com].

Here is our list of subject wikis:
{{:Subwiki:List of subject wikis}}

You can access the history of subject wikis [[Subwiki:History of subject wikis|here]].</rev>
        </revisions>
      </page>
    </pages>
  </query>
</api>