Pass arrays to node-mysql's client.format()

gistfile1.js

var ids = [291, 9123, 218];
client.query(
  'SELECT * FROM campaigns WHERE campaign_id IN (?)',
  [ ids ],
  function selectCb(err, results, fields) {
    if (err) {
      console.log(err);
      throw err;
    }
    console.log(results);
  }
);