https://commons.wikimedia.org/w/api.php?action=query&generat... search term here>&format=json

(see https://en.wikipedia.org/w/api.php?action=help&modules=query for reference)

edit: formatting

Amazing!

I notice a slight difference between

https://commons.wikimedia.org/w/api.php?action=query&generat...

and searching for 'cat' on canweimage.com

Is there some query processing needed?

I use these additional parameters: `&gsrlimit=25&prop=imageinfo|pageimages&iiprop=url|size`. I think it just changes how much and what type of data is returned, but maybe that could be the difference?