The website is for uploading and sharing My Little Pony fan art. Derpibooru is an image booru (sharing/commenting/voting system) for fans of the show My Little Pony: Friendship is Magic. A JSON API for major site functionality can be freely used by those who want to produce tools for the site or other ways to use the data provided within Derpibooru.
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So far, we don't have a record of any changes to this API