How can I find out on the server if JS is enabled in order to enable the necessary check for the validity of fields on the pages?

Question

JavaScript

I am writing a site on servlets + Tomcat on the server, there is support for field checks on registration or authorization pages, etc. Now I'm trying to add field validation to js, ​​and I ran into an obstacle, How can I find out on the server if js is working for the user to enable the necessary field validation ????
Perhaps I wrote a wild game, do not judge strictly for the first time I encounter this.
I will be glad to any advice or an example, Thanks.

Answer 1

Turn it on right away
On the back, you will still need to double-check
the PS: js is rarely disabled, even less often they make functionality for those who have disabled