Restricting route to static files in Express and Nodejs

I am currently trying to restrict the routes to users who haven't been logged. My main issue is that even if I define a page with a get method such as:

 app.get('/alpha/information', isLoggedIn,
        function(req, res){
            res.sendFile(path.join(__dirname + '/alpha/pages/Example.html'));
        });

The user can sill just edit the url to: http://localhost:3000/alpha/pages/Example.html and access the page. Now I have read several similar questions on SO but I cannot find the answer. Some of which I was inspired were: Q1,Q2, Q3. Nonetheless I was unable to find a solution to my issue.

My current file structure is: FileStructureLink

I am trying to restrict access to Example.html, ExampleTwo.html and blabla.html

I am using this code to set up the requests but I guess they might not be right:

app.use(express.static(path.join(__dirname, 'Alpha')));
app.use(express.static(path.join(__dirname, '/')));
app.use('/', express.static(__dirname + '/login.html'));

This app.use('/', express.static(__dirname + '/login.html')); specifically is used to make the default localhost:3000/ load as localhost:3000/login

How can I restrict access to all the static html files without having to write a route for each of them?

via coderJoe