$project

Aggregation $project

This aggregation stage passes only the specified fields along to the next aggregation stage.

Note: This is the same projection that is used with the find() method.

Example

db.restaurants.aggregate([
  {
    $project: {
      "name": 1,
      "cuisine": 1,
      "address": 1
    }
  },
  {
    $limit: 5
  }
])

This will return the documents but only include the specified fields.

Note: Notice that the _id field is also included. This field is always included unless specifically excluded.

We use a 1 to include a field and 0 to exclude a field.

Note: You cannot use both 0 and 1 in the same object. The only exception is the _id field. You should either specify the fields you would like to include or the fields you would like to exclude.