Namespaces for separation in Express - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a namespace in Express.js?

A namespace in Express.js is a way to group routes under a common path prefix to organize and separate different parts of an application.

beginner

How do you create a namespace for routes in Express?

You create a namespace by using an Express Router and mounting it on a path prefix with app.use('/prefix', router).

beginner

Why use namespaces (route prefixes) in Express applications?

Namespaces help keep routes organized, avoid route conflicts, and make the code easier to maintain by grouping related routes together.

intermediate

Example: What does this code do?
const router = express.Router();
router.get('/list', ...);
app.use('/users', router);

It creates a namespace '/users' so that the route '/users/list' is handled by the router's get method.

intermediate

Can namespaces in Express be nested? How?

Yes, namespaces can be nested by mounting routers inside other routers with different path prefixes.

What Express method is used to create a namespace for routes?

A app.route()

B express.namespace()

C app.listen()

D express.Router()

express.Router() creates a modular router which can be mounted as a namespace.

How do you mount a router under a namespace '/api'?

A app.use('/api', router)

B router.use('/api')

C app.get('/api', router)

D router.mount('/api')

app.use('/api', router) mounts the router so all its routes are prefixed with '/api'.

What is a benefit of using namespaces in Express?

A Improves route organization

B Slows down the server

C Removes middleware

D Disables routing

Namespaces help organize routes logically and avoid conflicts.

If a router has a route '/list' and is mounted at '/users', what is the full route path?

A /users

B /list

C /users/list

D /list/users

The full path combines the mount point and the router route.

Can you nest routers inside other routers in Express?

A Only in Express 5

B Yes, by mounting routers inside routers

C Only with special plugins

D No, routers cannot be nested

Routers can be nested by mounting one router inside another.

Explain how namespaces help organize routes in an Express app.

Think about how grouping routes under a shared path helps keep code tidy.

Describe the steps to create and use a namespace with Express Router.

Start from making a router, then connect it to the main app.