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>
    <allimages aistart="2018-08-26T15:35:48Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="軸.png" timestamp="2022-05-04T07:17:05Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/8/81/%E8%BB%B8.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:%E8%BB%B8.png" ns="6" title="ファイル:軸.png" />
      <img name="Flaskアプリ起動003.png" timestamp="2018-12-01T08:51:10Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/9/95/Flask%E3%82%A2%E3%83%97%E3%83%AA%E8%B5%B7%E5%8B%95003.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Flask%E3%82%A2%E3%83%97%E3%83%AA%E8%B5%B7%E5%8B%95003.png" ns="6" title="ファイル:Flaskアプリ起動003.png" />
      <img name="Flaskアプリ起動002.png" timestamp="2018-12-01T08:48:22Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/f/f2/Flask%E3%82%A2%E3%83%97%E3%83%AA%E8%B5%B7%E5%8B%95002.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Flask%E3%82%A2%E3%83%97%E3%83%AA%E8%B5%B7%E5%8B%95002.png" ns="6" title="ファイル:Flaskアプリ起動002.png" />
      <img name="Flaskアプリ起動001.png" timestamp="2018-12-01T08:31:40Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/7/7d/Flask%E3%82%A2%E3%83%97%E3%83%AA%E8%B5%B7%E5%8B%95001.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Flask%E3%82%A2%E3%83%97%E3%83%AA%E8%B5%B7%E5%8B%95001.png" ns="6" title="ファイル:Flaskアプリ起動001.png" />
      <img name="Pack_frame_16.png" timestamp="2018-08-27T08:23:45Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/7/79/Pack_frame_16.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Pack_frame_16.png" ns="6" title="ファイル:Pack frame 16.png" />
      <img name="Pack_frame_15.png" timestamp="2018-08-27T08:21:00Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/d/d0/Pack_frame_15.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Pack_frame_15.png" ns="6" title="ファイル:Pack frame 15.png" />
      <img name="Pack_frame_14.png" timestamp="2018-08-27T08:15:49Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/0/0d/Pack_frame_14.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Pack_frame_14.png" ns="6" title="ファイル:Pack frame 14.png" />
      <img name="Pack_frame_13.png" timestamp="2018-08-27T08:05:41Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/e/ed/Pack_frame_13.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Pack_frame_13.png" ns="6" title="ファイル:Pack frame 13.png" />
      <img name="Pack_frame_12.png" timestamp="2018-08-27T07:57:16Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/2/20/Pack_frame_12.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Pack_frame_12.png" ns="6" title="ファイル:Pack frame 12.png" />
      <img name="Pack_frame_11.png" timestamp="2018-08-26T15:36:28Z" user="Nakamuri" url="https://www.nakamuri.info/mw/images/4/49/Pack_frame_11.png" descriptionurl="https://www.nakamuri.info/mw/index.php/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Pack_frame_11.png" ns="6" title="ファイル:Pack frame 11.png" />
    </allimages>
  </query>
</api>