Node.js - How to hide html pages?

I have html pages which shouldn’t be seen by the users who haven’t logged in. I used the command below and my html pages became public.

app.use(express.static('public'));

For example, I do not want users who are not logged in to see this page.

http://localhost:3000/admin.html

NOTE: what I'm talking about is not a cookie. When you enter the address of the html page in the toolbar, if it is not logged in, it should not be able to reach that page.