How it's going to work ?

Routes

Each method will have it's own individual route, such as:

• Add todo
• Remove todo
• Update todo
• See the list of all ToDo's
• Login and Register

Multiple users

The program will have a login scheme. It will allow multiple users to login, and see it's own ToDO's. It will have a login route as well.
It will also have it's own complex system of sessions. And users who are not logged in, won't be able to go to /todos.

Database

The program had a MySQL Database before the one now ( MongoDB ). But it was successfully switched.

The program will have one database, two collections:

1. Users collection
2. ToDO's collection

The collections are relational, and the ToDo's collection has it's own _id, but it also takes the user._id ( the owner of the todo ).
Being so, when the user is logged in, the /todos searches automatically for the todos with the user._id.

Login and Register

The Login and Register part is one of the best I've ever created.
It has a complex scheme of:

• Register
  • Requires name of at least 3 characters long.
  • Requires a trusty email ( @gmail.com / @yahoo.com / ...)
  • Requires a strong, non-repeat password: ( good: pass123word4, bad: 111111 )
• Login
  • With a complex system of session.
  • The user who's logged in, cannot go to the /login or /register pages.
  • The user who's not logged in, cannot go to the /todos, /todos/add_todo and /todos/remove_todo pages.
  • The user can even leave the website, and when they are back, the session will still be stored.