cursor.count() - Return the number of documents returned by the find() method on a collection command

Returns the number of documents returned by the find() method on a collection.

Syntax diagram

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Command parameters

document
A JSON query for filtering a subset of data in a find() method.

Examples

The following example shows the command syntax for returning the number of documents returned by the find() method on the collection, books:
db.books.find().count()
The following example shows the output returned from including the count option in the find() operation:
15
The following example shows the command syntax for returning the number of documents for an author that are returned by the find() method on the collection, books: 
db.books.find({author: "Tolkien, J.R"}).count()
The following example shows the output returned from including the count option in the find({author...}) operation::
2