Projection

1 to include, 0 to exclude

The second argument to find() is a projection — set a field to 1 to include it, 0 to exclude it.

Projection example

_id is included by default — exclude it explicitly if you don't need it.

db.users.find({ role: "engineer" }, { name: 1, role: 1, _id: 0 })

Output:

{ name: 'Grace Hopper', role: 'engineer' }
{ name: 'Barbara Liskov', role: 'engineer' }