The trick is to use _all_docs, and then select the ones that interest you from this list with a start key and a final key.
Since all _id project documents start with _design /, we can select all documents between _design / and the next character, which is 0, giving _design0.
http://www.couch.db:5984/database/_all_docs?startkey="_design/"&endkey="_design0"
Good luck
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