couchdb_delete_non_design_docs.js

var cradle = require('cradle');

var connection = new cradle.Connection(
  'https://user:password@host',
  443
);
var db = connection.database('database')

db.all({include_docs: true}, function(err, allDocs) {
  if (err) {
    console.log(err);
  } else {
    allDocs.forEach(function(doc) {
        if (doc._id) {
          if (doc._id.indexOf('__design') == -1) {
            db.remove(doc._id, doc._rev, console.log);
          }
        } else {
          console.log('doc: '+JSON.stringify(doc).slice(0, 100));
        }
    })
  }
});