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>
    <blocks bkstart="2014-07-04T02:42:42Z" />
  </query-continue>
  <query>
    <blocks>
      <block id="110" user="Piet Pompies" by="Dan" timestamp="2018-07-31T03:27:45Z" expiry="infinity" reason="Spamming links to external sites" nocreate="" autoblock="" />
      <block id="108" user="Antuan Ericson" by="Dan" timestamp="2018-07-20T08:41:39Z" expiry="infinity" reason="Spamming links to external sites" nocreate="" autoblock="" />
      <block id="107" user="76.164.225.4" by="Dan" timestamp="2018-07-11T14:53:47Z" expiry="infinity" reason="Spamming links to external sites" anononly="" nocreate="" />
      <block id="103" user="Smith Kerry" by="Dan" timestamp="2017-06-14T06:39:14Z" expiry="infinity" reason="Spamming links to external sites" nocreate="" autoblock="" />
      <block id="102" user="75.109.215.94" by="Dan" timestamp="2016-08-28T20:37:43Z" expiry="infinity" reason="Spamming links to external sites" anononly="" nocreate="" />
      <block id="100" user="Lukong Yannick" by="Dan" timestamp="2016-07-30T12:10:43Z" expiry="infinity" reason="Spamming links to external sites" nocreate="" autoblock="" />
      <block id="99" user="Kfnv Fdkjb" by="Dan" timestamp="2016-01-20T16:38:17Z" expiry="infinity" reason="Removing content from pages" nocreate="" autoblock="" />
      <block id="97" user="John Nenoe" by="Dan" timestamp="2016-01-19T20:32:26Z" expiry="infinity" reason="Spamming links to external sites" nocreate="" autoblock="" />
      <block id="96" user="198.203.30.83" by="Dan" timestamp="2015-08-27T15:46:06Z" expiry="infinity" reason="Spamming links to external sites" anononly="" nocreate="" />
      <block id="94" user="Barry Llynn" by="Dan" timestamp="2015-07-20T01:51:51Z" expiry="infinity" reason="Spamming links to external sites" nocreate="" autoblock="" noemail="" />
    </blocks>
  </query>
</api>