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 bkcontinue="20141103101934|3" />
  </query-continue>
  <query>
    <blocks>
      <block id="20" user="翼運輸サービス株式会社" by="Baser" timestamp="2021-07-07T06:55:57Z" expiry="infinity" reason="虚偽情報の挿入: spam" nocreate="" autoblock="" noemail="" />
      <block id="19" user="Gondoh1" by="Baser" timestamp="2014-11-04T03:35:35Z" expiry="infinity" reason="複数アカウントの不正利用" nocreate="" autoblock="" noemail="" />
      <block id="17" user="PearlinTrouette" by="Baser" timestamp="2014-11-04T03:17:13Z" expiry="infinity" reason="外部サイトへのスパムリンク追加" nocreate="" autoblock="" noemail="" />
      <block id="15" user="NildaV76mfj" by="Baser" timestamp="2014-11-04T03:16:54Z" expiry="infinity" reason="外部サイトへのスパムリンク追加" nocreate="" autoblock="" noemail="" />
      <block id="13" user="PhilipEichel" by="Baser" timestamp="2014-11-04T03:16:46Z" expiry="infinity" reason="外部サイトへのスパムリンク追加" nocreate="" autoblock="" noemail="" />
      <block id="11" user="RachelKelleher" by="Baser" timestamp="2014-11-04T03:16:36Z" expiry="infinity" reason="外部サイトへのスパムリンク追加" nocreate="" autoblock="" noemail="" />
      <block id="9" user="Raymon6734" by="Baser" timestamp="2014-11-04T03:15:53Z" expiry="infinity" reason="外部サイトへのスパムリンク追加" nocreate="" autoblock="" noemail="" />
      <block id="8" user="23.106.244.96" by="Baser" timestamp="2014-11-03T10:23:41Z" expiry="infinity" reason="外部サイトへのスパムリンク追加" anononly="" nocreate="" noemail="" />
      <block id="6" user="Antonia6981" by="Baser" timestamp="2014-11-03T10:23:17Z" expiry="infinity" reason="外部サイトへのスパムリンク追加" nocreate="" autoblock="" noemail="" />
      <block id="4" user="DaniloMazzeo" by="Baser" timestamp="2014-11-03T10:23:02Z" expiry="infinity" reason="外部サイトへのスパムリンク追加" nocreate="" autoblock="" noemail="" />
    </blocks>
  </query>
</api>