Adding a Field to the Register Form

Hello,

I would like to add an additional field to the original version of the register form. Currently there is: username, email, and password. For a project I am working on, I would like for the user to also include their zip code as a field, so I can use that data to create a feature for the website. I see that register form is in the file register.js but I would like to know what's the best way to approach adding a new field because I'm certain that there will also be backend changes through Django to accomplish this. Please let me know, thanks!

1) modify front js code add new input field , this step is react js skill
2) modify python code which provide register api : from the api code trace into python model file, add new fields , also need db migrate , this step work is django skills