Let's assume you're using a newer version of mongoose for instance 6.9.0.

Then you can do this:

const agg = Model.aggregate([{ $match: { age: { $gte: 25 } } }]);

for await (const doc of agg) {

console.log(doc.name);

}

or

const aggregate = Model.aggregate([

{ $project: { a: 1, b: 1 } },

{ $skip: 5 }

]);

Kindly read more here https://mongoosejs.com/docs/api/aggregate.html