removeDocsFromCouchdb.js

var targetDB = 'db';
var blacklist = ['_design/']
$.couch.db(targetDB).allDocs({'success':function(all_docs){
  for (var i = 0; i < all_docs.rows.length; ++i) {
    var docId = all_docs.rows[i].id;
    if (blacklist.indexOf(docID) === -1) {
     $.couch.db(targetDB).openDoc(docId, {'success':function(doc){
       $.couch.db(targetDB).removeDoc(doc);
     }});
    }
  }
}});