Lesson 16 — Simple router

Map paths to handlers

A web server must decide what to do for each URL path. A router is a lookup table: path → handler function. Frameworks like Express write it as app.get("/about", handler). If no path matches, the server answers 404 (not found).

const handle = (p) => (routes[p] || notFound)();

Note: this playground runs JavaScript in your browser, not in real Node, so Node-only tools (like fs or http) are not available. The exercise is a small plain-JS simulation of the Node idea.

Why it matters: routing is the first thing every web server does with a request.