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Find a Document
Note
If you specify a callback method, findOne() returns nothing. If you do
not specify one, this method returns a Promise that resolves to the
result object when it completes. See our guide on Promises and
Callbacks for more information, or the
API documentation for
information on the result object.
You can query for a single document in a collection with the
collection.findOne() method. The findOne() method uses a query
document that you provide to match only the subset of the documents in the
collection that match the query. If you don't provide a query document or if
you provide an empty document, MongoDB matches all documents in the
collection. The findOne() operation only returns the first matched
document. For more information on querying MongoDB, see our
documentation on query documents.
You can also define additional query options such as
sort
and projection
to configure the returned document. You can specify the additional options
in the options object passed as the second parameter of the
findOne method. For detailed reference documentation, see
collection.findOne().
Example
The following snippet finds a single document from the movies
collection. It uses the following parameters:
A query document that configures the query to return only movies with the title of exactly the text
'The Room'.A sort that organizes matched documents in descending order by rating, so if our query matches multiple documents the returned document will be the document with the highest rating.
A projection that explicitly excludes the
_idfield from returned documents and explicitly includes only thetitleandimdbobject (and its embedded fields).
Note
You can use this example to connect to an instance of MongoDB and interact with a database that contains sample data. To learn more about connecting to your MongoDB instance and loading a sample dataset, see the Usage Examples guide.
If you run the preceding example, you should see the following output:
{ title: 'The Room', imdb: { rating: 3.5, votes: 25673, id: 368226 } }