Mongodb aggregate count

Mongo count

db.collection.countDocuments( <query>, <options> )

Source: docs.mongodb.com

Mongodb aggregate count

#return the number of documents whose "field" field has a value of A 
query = db.collection.aggregate([{
          "$match": {
            "field": "A"
          }
        },{
          "$count": "number of occurrences"
}])

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