08 — Routing & Router

Core Concepts

• express.Router() — modular, mountable route handler
• Route grouping — organize routes by feature/resource
• Router-level middleware — middleware scoped to a router
• app.use('/prefix', router) — mount router at a path prefix
• router.param() — middleware that runs when a specific param is present
• Route chaining — router.route('/path').get().post()