How to refresh all existing web pages after clearing the cache | using express or node.js

When the user logs out, the server clears the cache. I dont know how to refresh other existing web pages to update.

admin.get('/logout',(req,res)=>{
    req.session.destroy(()=>{
        // clear cookie
        res.clearCookie('connect.sid');
        res.redirect('/admin/login');  
    });
})

Thanks in advance!