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mongo Shell Method

This page documents the mongo shell method, and does not refer to the MongoDB Node.js driver (or any other driver) method. For corresponding MongoDB driver API, refer to your specific MongoDB driver documentation instead.

Deprecated since version 3.0.


Starting in version 4.2, MongoDB removes the eval command. The deprecated db.collection.copyTo(), which wraps the eval command, can only be run against MongoDB 4.0 or earlier versions. For behavior and example, refer to the 4.0 or earlier version of the manual.

Copies all documents from collection into newCollection using server-side JavaScript. If newCollection does not exist, MongoDB creates it.

Parameter Type Description
newCollection string The name of the collection to write data to.

db.collection.copyTo() returns the number of documents copied. If the copy fails, it throws an exception.