As a backend developer who build a register or login page should consider these for coding the form.
- Don't allow the user details to be very long. In terms of them writing their first name,last name and other name, it's unnecessary. Instead of a user should write their full name in a input.
- Don't put validation in the username. In terms of "your username is not greater 8 character" avoid unnecessary validation. Let the user choose his/her choice of username.
- Always allow the user to know their mistake before submitting the form. In terms of user inputting their password and confirm password and make a message box to show their error before submitting into the form.
- If the user input details is long is in form of stack step try as much as possible with multiple step. Thanks you for following us give us a feedback.