MongoDB Aggregation $count
Aggregation $count
This aggregation stage counts the total amount of documents passed from the previous stage.
Example
In this example, we are using the "sample_restaurants" database loaded from our sample data in the Intro to Aggregations section.
db.restaurants.aggregate([
{
$match: { "cuisine": "Chinese" }
},
{
$count: "totalChinese"
}
])
This will return the number of documents at the $count stage as a field
called "totalChinese".