Get number of records in MongoDB?

To get number of records, use count() in MongoDB. Let us create a collection with documents −

> db.demo697.insertOne({Name:"Chris",Age:21});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ea6d7d1551299a9f98c9395")
}
> db.demo697.insertOne({Name:"Bob",Age:23});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ea6d7d8551299a9f98c9396")
}
> db.demo697.insertOne({Name:"David",Age:24});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ea6d7dd551299a9f98c9397")
}

Display all documents from a collection with the help of find() method −

> db.demo697.find();

This will produce the following output −

{ "_id" : ObjectId("5ea6d7d1551299a9f98c9395"), "Name" : "Chris", "Age" : 21 }
{ "_id" : ObjectId("5ea6d7d8551299a9f98c9396"), "Name" : "Bob", "Age" : 23 }
{ "_id" : ObjectId("5ea6d7dd551299a9f98c9397"), "Name" : "David", "Age" : 24 }

Following is the query to get number of records −

> var numberOfRecords= db.demo697.count();
> print("Number of records=",numberOfRecords);

This will produce the following output −

Number of records= 3