I’m in the middle of writing my next pocket guide, Vanilla JS Web Apps, with a focus on single page apps.
One of the things the book covers is how to route and display different URLs for different pages when you’re really serving the same single HTML file each time.
This is made super easy with the browser History API.
How the History API works The History API exposes a few really useful methods, most notably the pushState() method and onpopstate event.