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="2023-05-20T07:15:47Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="Boite_aux_lettres-min.png" timestamp="2023-10-14T14:29:28Z" user="Nils78" url="https://wiki.electrolab.fr/images/9/90/Boite_aux_lettres-min.png" descriptionurl="https://wiki.electrolab.fr/File:Boite_aux_lettres-min.png" ns="6" title="File:Boite aux lettres-min.png" />
      <img name="Boite_aux_lettres-min.JPG" timestamp="2023-10-14T14:20:54Z" user="Nils78" url="https://wiki.electrolab.fr/images/b/b2/Boite_aux_lettres-min.JPG" descriptionurl="https://wiki.electrolab.fr/File:Boite_aux_lettres-min.JPG" ns="6" title="File:Boite aux lettres-min.JPG" />
      <img name="Dual_bpf_alex_amplitude.png" timestamp="2023-05-20T15:47:39Z" user="Marc" url="https://wiki.electrolab.fr/images/e/e3/Dual_bpf_alex_amplitude.png" descriptionurl="https://wiki.electrolab.fr/File:Dual_bpf_alex_amplitude.png" ns="6" title="File:Dual bpf alex amplitude.png" />
      <img name="Zolotarev.jpg" timestamp="2023-05-20T07:41:14Z" user="Marc" url="https://wiki.electrolab.fr/images/2/2c/Zolotarev.jpg" descriptionurl="https://wiki.electrolab.fr/File:Zolotarev.jpg" ns="6" title="File:Zolotarev.jpg" />
      <img name="Rack_4U.jpg" timestamp="2023-05-20T07:31:22Z" user="Marc" url="https://wiki.electrolab.fr/images/3/31/Rack_4U.jpg" descriptionurl="https://wiki.electrolab.fr/File:Rack_4U.jpg" ns="6" title="File:Rack 4U.jpg" />
      <img name="Façade_3U.jpg" timestamp="2023-05-20T07:31:05Z" user="Marc" url="https://wiki.electrolab.fr/images/2/2c/Fa%C3%A7ade_3U.jpg" descriptionurl="https://wiki.electrolab.fr/File:Fa%C3%A7ade_3U.jpg" ns="6" title="File:Façade 3U.jpg" />
      <img name="Andromeda_arriere.jpg" timestamp="2023-05-20T07:30:37Z" user="Marc" url="https://wiki.electrolab.fr/images/7/7c/Andromeda_arriere.jpg" descriptionurl="https://wiki.electrolab.fr/File:Andromeda_arriere.jpg" ns="6" title="File:Andromeda arriere.jpg" />
      <img name="Andromeda1.jpg" timestamp="2023-05-20T07:30:11Z" user="Marc" url="https://wiki.electrolab.fr/images/3/35/Andromeda1.jpg" descriptionurl="https://wiki.electrolab.fr/File:Andromeda1.jpg" ns="6" title="File:Andromeda1.jpg" />
      <img name="Munin_block_schematic.png" timestamp="2023-05-20T07:16:45Z" user="Marc" url="https://wiki.electrolab.fr/images/f/fe/Munin_block_schematic.png" descriptionurl="https://wiki.electrolab.fr/File:Munin_block_schematic.png" ns="6" title="File:Munin block schematic.png" />
      <img name="Protection_board.jpg" timestamp="2023-05-20T07:16:12Z" user="Marc" url="https://wiki.electrolab.fr/images/9/93/Protection_board.jpg" descriptionurl="https://wiki.electrolab.fr/File:Protection_board.jpg" ns="6" title="File:Protection board.jpg" />
    </allimages>
  </query>
</api>