Serialization on node js

serialize.js

function insertCollection(collection, callback) {
  var coll = collection.slice(0); // clone collection
  (function insertOne() {
    var record = coll.splice(0, 1)[0]; // get the first record of coll and reduce coll by one
    db.insert(record, function(err) {
      if (err) { callback(err); return }
      if (coll.length == 0) {
        callback();
      } else {
        insertOne();
      }
    })
  })();
}