How to implement routing in express.js?

Q: How to implement routing in express.js?

const express = require('express') const app = express() // respond with "hello world" when a GET request is made to the homepage app.get('/', (req, res) => { res.send('hello world') }) get post put delete head options checkout copy lock merge mkactivity mkcol move m-search notify patch purge report search subscribe trace unlock unsubscribe

Difficulty: 5/10

router, middleware, versioning

You define routing using methods of the Express app object that correspond to HTTP methods; for example, app.get() to handle GET requests and app.post to handle POST requests.

javascript

All available methods are:

1
get
2
post
3
put
4
delete
5
head
6
options
7
checkout

Scenario Questions

0-2 years experience

1We need a new GET endpoint at /api/users that returns a JSON array of users. Walk me through the exact code you’d write to add this route in an Express app.
2If you have routes defined as '/users/:id' and '/users/profile', which one will match a request to '/users/profile' and why?
3What happens if you forget to call next() inside a middleware attached to a route, and how would you notice the problem?

Follow-up Questions

How would you write a test to verify this route returns the expected data?
If you needed to add rate limiting to this endpoint, where would you place that middleware?
Can you explain how the order of route definitions influences which handler is chosen?