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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.
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<?xml version="1.0"?>
<api>
<query>
<allcategories>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">All pages needing cleanup</c>
<c size="2" pages="2" files="0" subcats="0" xml:space="preserve">All redirect templates</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Archival templates</c>
<c size="2" pages="2" files="0" subcats="0" xml:space="preserve">' .. cat .. '</c>
<c size="2" pages="2" files="0" subcats="0" xml:space="preserve">Citation Style 1 templates</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Date-computing templates based on current time</c>
<c size="4" pages="4" files="0" subcats="0" xml:space="preserve">Documentation assistance templates</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Ill-formatted IPAc-en transclusions</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Interwiki link templates</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Intricate templates</c>
</allcategories>
</query>
<query-continue>
<allcategories accontinue="Lua-based_templates" />
</query-continue>
</api>