/api/v1/json/filters/:idand will take an optional
keyparameter that will (of course) unlock any non-public/non-system filters belonging to the associated user.
https://derpibooru.org/filters.jsonendpoint? I can use
/api/v1/json/filters/:filter_idto ask about a specific filter ID, but that requires that I already know the ID.
userendpoint will return
403unless provided with an API key. With a key it will return all the filters (pagable list) belonging to that user.
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