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>
    <recentchanges rccontinue="2016-07-07 17:47:29+00|4399" />
  </query-continue>
  <query>
    <recentchanges>
      <rc type="new" ns="8" title="MediaWiki:Titleblacklist" pageid="2204" revid="4946" old_revid="0" rcid="4414" timestamp="2017-04-06T17:17:11Z" />
      <rc type="new" ns="0" title="Test page 1" pageid="2203" revid="4945" old_revid="0" rcid="4413" timestamp="2017-03-20T21:31:14Z" />
      <rc type="log" ns="2" title="Utilisateur:Sasasoti" pageid="0" revid="0" old_revid="0" rcid="4412" timestamp="2017-03-12T22:22:33Z" />
      <rc type="log" ns="0" title="Release Notes 2015-02-11" pageid="0" revid="0" old_revid="0" rcid="4411" timestamp="2017-03-12T22:22:01Z" />
      <rc type="log" ns="0" title="1 (888)757^3560 apple airport extreme support number apple airport extreme support apple airport extreme phone number apple airport apple airport extreme" pageid="0" revid="0" old_revid="0" rcid="4410" timestamp="2017-03-12T22:21:52Z" />
      <rc type="log" ns="0" title="+1 (888)=757=3560 windows password recovery windows 7 password recovery windows password recovery tool usb windows 10 password recovery windows 7 password recovery tool usb" pageid="0" revid="0" old_revid="0" rcid="4409" timestamp="2017-03-12T22:21:26Z" />
      <rc type="log" ns="6" title="Fichier:Equipment-Barbarous Thorn Blade icon.png" pageid="724" revid="0" old_revid="0" rcid="4403" timestamp="2016-07-07T17:49:13Z" />
      <rc type="log" ns="6" title="Fichier:Equipment-Barbarous Thorn Blade icon.png" pageid="724" revid="0" old_revid="0" rcid="4402" timestamp="2016-07-07T17:48:59Z" />
      <rc type="log" ns="6" title="Fichier:Equipment-Barbarous Thorn Blade icon.png" pageid="724" revid="0" old_revid="0" rcid="4401" timestamp="2016-07-07T17:48:38Z" />
      <rc type="log" ns="6" title="Fichier:Equipment-Barbarous Thorn Blade Stats.png" pageid="992" revid="0" old_revid="0" rcid="4400" timestamp="2016-07-07T17:48:07Z" />
    </recentchanges>
  </query>
</api>