express.static middleware - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is express.static middleware used for in Express?

express.static is used to serve static files like images, CSS, and JavaScript files to clients directly from a folder.

beginner

How do you use express.static to serve files from a folder named public?

You use it like this: app.use(express.static('public'));. This tells Express to serve files from the public folder.

intermediate

Can you explain what happens when a client requests /images/logo.png and you have app.use(express.static('public'));?

Express looks inside the public folder for images/logo.png. If it finds the file, it sends it back to the client as a static file.

intermediate

What is the benefit of using express.static middleware instead of manually sending files?

It simplifies serving files, handles caching headers automatically, and improves performance by letting Express manage static content efficiently.

intermediate

How can you serve static files from a virtual path prefix like /static?

You can add a path prefix like this: app.use('/static', express.static('public'));. Then files in public are served under /static URL.

What does express.static middleware do?

A Handles database connections

B Serves static files like images and CSS

C Parses JSON request bodies

D Manages user sessions

express.static is specifically for serving static files such as images, CSS, and JavaScript.

How do you serve files from a folder named assets using express.static?

A app.use(express.static('assets'));

B app.static('assets');

C app.get('/assets', express.static());

D express.static('assets');

You use app.use(express.static('assets')); to serve static files from the assets folder.

If you want to serve static files under the URL path /files, which code is correct?

A express.static('/files', 'public');

B app.use(express.static('/files'));

C app.get('/files', express.static('public'));

D app.use('/files', express.static('public'));

Using app.use('/files', express.static('public')); serves files from public folder under the /files URL prefix.

What happens if a requested static file is not found in the folder?

A Express moves to the next middleware or route

B Express crashes

C Express sends a blank response

D Express automatically creates the file

If the file is not found, Express continues to the next middleware or route handler.

Which of these is NOT a benefit of using express.static?

A Automatic caching headers

B Simplifies serving static files

C Manages database queries

D Improves performance for static content

express.static does not manage database queries; it only serves static files.

Explain how to use express.static middleware to serve static files from a folder and why it is useful.

Think about how websites show images and styles without extra code.

Describe how to serve static files under a URL prefix using express.static and what effect this has on the URL paths.

Imagine putting all images under /static in the URL.