How to count the number of documents in a mongodb collection

Question

I would like to know how to count the number of documents in a collection. I tried the follow

var value = collection.count();
&&
var value = collecti         


        

Answer 1

db.collection('collection-name').count() is now deprecated. Instead of count(), we should now use countDocuments() and estimatedDocumentCount(). Here is an example:

`db.collection('collection-name').countDocuments().then((docs) =>{
console.log('Number of documents are', docs);
    };`

To know more read the documentation:

https://docs.mongodb.com/manual/reference/method/db.collection.countDocuments/

https://docs.mongodb.com/manual/reference/method/db.collection.estimatedDocumentCount/

Answer 2

If you want the number of documents in a collection, then use the count method, which returns a Promise. Here's an example:

let coll = db.collection('collection_name');
coll.count().then((count) => {
    console.log(count);
});

This assumes you're using Mongo 3.

Edit: In version 4.0.3, count is deprecated. use countDocument to achieve the goal.