Saving a user's favorites
You can define a User schema like this:
var User = new Schema({ favorites: [{ whatHaveYou: String, }]})Now, with using passport.js, after you have authenticating the user with this schema, you will be able to access the favorites with: req.user.favorites.
I suggest you go throw this demo project on github for setting up a node-express-mongoose project with passportjs if you have any more questions: https://github.com/madhums/node-express-mongoose-demo, this helped me a lot.