Express Routing

Question 1

What is routing in Express.js?

Answer 1

Routing directs requests to the corresponding controllers/methods based on the request’s method and url (path).

Question 2

Difference between middleware and routing

Answer 2

Middleware are functions and routing is a process.

Middleware can perform some actions, end the request-response cycle or call the next middleware function.

Question 3

How to implement routing? How do you define routes in Express.js?

Answer 3

app.get(“/”,(req,res)=>{ res.send(“Something”) })

Question 4

What are Route Parameters?

Answer 4

A route/path might have dynamic part. That’s the Route Parameter.

app.get(‘/users/:userId’)
req.params.userId is a route parameter.

Question 5

What are router object & router methods and how to implement them?

Answer 5

const router = express.Router();

router.get(…)

It’s the same as using app.use() but this improves modularity.

To mount the router: app.use(“/api”, router)

Question 6

What are router methods?

Answer 6

router.get(path,callback)
router.post(path,callback)
router.put(path,callback)
router.delete(path,callback)