Route matching order matters in Express - Cheat Sheet & Quick Revision

Recall & Review

beginner

What happens if you place a general route before a specific route in Express?

The general route will match first and handle the request, so the specific route will never be reached.

beginner

Why does route order matter in Express?

Express checks routes in the order they are defined and stops at the first match. So, order controls which route handles a request.

intermediate

Given these routes, which one matches the URL '/user/profile'? <br>app.get('/user/profile', ...)<br>app.get('/user/:id', ...)

If /user/:id is defined before /user/profile, it will match '/user/profile' as id='profile'. So order matters to get the right route.

beginner

How can you ensure a specific route is matched before a general one?

Define the specific route first in your code, then the general route after it.

intermediate

What is the effect of placing a wildcard route like app.get('*', ...) at the top?

It will catch all requests and prevent any other routes from running, blocking specific routes below it.

In Express, which route should be defined first to correctly handle '/user/profile'?

A app.get('/user', ...)

B app.get('/user/:id', ...)

C app.get('*', ...)

D app.get('/user/profile', ...)

Specific routes like '/user/profile' should be defined before parameter routes like '/user/:id' to match correctly.

What happens if you put a wildcard route app.get('*', ...) before other routes?

A It will match only GET requests to '/'

B Other routes will never be reached.

C It will be ignored.

D It will only match unknown routes.

Wildcard routes catch all requests and block routes defined after them.

Express matches routes in which order?

A Alphabetical order

B By route length

C Order routes are defined in code

D Random order

Express checks routes in the order they appear in the code.

If you want a route to catch all unmatched requests, where should you place it?

A At the bottom of the route list

B In the middle of the route list

C At the top of the route list

D Anywhere, order does not matter

Catch-all routes should be last to avoid blocking other routes.

Which route will match '/user/123' if defined in this order? <br>1. app.get('/user/:id', ...) <br>2. app.get('/user/profile', ...)

A /user/:id

B /user/profile

C Both routes

D No route

The first matching route '/user/:id' will handle '/user/123'.

Explain why the order of route definitions matters in Express and give an example.

Think about how Express stops checking after the first match.

Describe what happens if a wildcard route is placed before other routes in Express.

Consider the effect of a catch-all route on routing.