Customize login system

Is it possible to customize the built in login-signup system in the erpnext e.g adding custom fields in the registration?

Login system is not customizable. Please share your usecase.

I don’t have a usecase in handy. But what I want is just to add an extra field for phone number in the signup page along with the email.

Not good idea to disturb login functionality. It will affect your flow, future updates as well as need lot’s of customization to validate phone number along with email and password.

If you still interested to play with it.

This is login page template, here you can add your phone number field. Explore the script for more details.