How to add nested objects in Node Mongoose schemas?

To add nested objects in Node Mongoose schemas, we set the type property to another schema.

For instance, we write

const AddressSchema = mongoose.Schema({
  city: String,
  street: String,
  houseNumber: String,
});

const ContactInfoSchema = mongoose.Schema({
  tel: [Number],
  email: [String],
  address: {
    type: AddressSchema,
    required: true,
  },
});

const CustomerSchema = mongoose.Schema({
  firstName: String,
  lastName: String,
  company: String,
  connectInfo: ContactInfoSchema,
});

to create the CustomerSchema that has the connectInfo property set to the ContactInfoSchema.

And the ContactInfoSchema has the address property set to the AddressSchema as its type.