How does routing work in Express?
You map HTTP methods and URL paths to handlers with app.get, app.post, etc. Use :name for URL params (req.params), ?key=value for query strings (req.query), and express.Router to group routes by feature.
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More FAQs in Express Routing Basics: Methods and Paths
GET for reading (safe, idempotent), POST for creating, PUT for full replace, PATCH for partial update, DELETE for removing. Pick by semantics, not by habit.
Define a route with :name: /users/:id. Read it with req.params.id. Params are always strings. Convert to ObjectId or number when needed.
For grouping routes by feature. You create a router in routes/users.js, add routes to it, and mount it in app.js with app.use('/users', usersRouter). Cleaner than putting every route in app.js.
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