MongoDB TTL Link to heading

In Mongo, “time to live” is a collection feature which allows docs to be automatically removed in the background.

TTL is implemented through indexes. Given a collection with a date type property, we create an index including the expireAfterSeconds property:

  "createdAt": 1
}, {
  expireAfterSeconds: 30

If createdAt is present in the document, mongod will automatically remove the document at createdAt + 30s.

Mongoose Link to heading

In Mongoose this can be done in the schema creation:

const sessionSchema = new mongoose.Schema({
  userId: String,
  createdAt: {type: Date, expires: 30}