What is a Javascript Router?

[David263]

I read the README, but I can't guess what a Router is (other than the hardware that decodes and splits ethernet signals).

[denilsonsa]

For a SPA (Single Page Application), it is common to have multiple URL paths pointing to the exact same HTML page and JavaScript code. A front-end router, in this case, parses the URL path and chooses what has to be rendered. It reacts to changes in the URL.

[David263]

Thank you. In the years since I posted this question in 2018, I have implemented several websites (not SPAs) that use a router, so I'm not stuck with the horrible .htaccess language for processing incoming URLs (although I use PHP instead of JavaScript). Thanks for eventually giving a good answer to my question.