count

$count

Counts the number of documents input to the $count stage and outputs the document count with your custom field name to the next phase in the aggregation pipeline.

Syntax

{ "$count": "<string>" }

For the <string> placeholder, enter a custom name for the output field that has the count as its value. The string you enter cannot contain the following:

• The special character,.
• The special character, $, at the start of the string
• An empty string

Sample Request

[    {        "$match": {            "temp": {                "$gt": 10            }        }    },    {        "$count": "tempGreaterThan10"    }]

Sample Response

{    "_list": [        {            "tempGreaterThan10": 44        }    ]}