Ajax registration form strictly using bootstrap, HTML and javastript

Please help me out. I am required to create a code using Ajax without PHP, JQeury or anything like that.
I can only make use of HTML, Bootstrap and Javascript. It should be a registrion form(name, surname,email,username and password).

I have looking at different videos and they all make use of IQuery or php or other servers.

I read information on bootstrap, HTML and Ajax, that I understood.
I watched different videos, they were helful. Problem is, they all make use of other servers such as PHP.
I am knew to programming hence I first had to watch vides and research.
I wanted explanations or a video that only uses Ajax, boostrap, HTML and Javastript. Thanks