How to copy a collection from one database to another in MongoDB

Question

Is there a simple way to do this?

Answer 1

If RAM is not an issue using insertMany is way faster than forEach loop.

var db1 = connect(':/')
var db2 = connect(':/')

var _list = db1.getCollection('collection_to_copy_from').find({})
db2.collection_to_copy_to.insertMany(_list.toArray())