DELETE route handling in Express - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a DELETE route in Express?

A DELETE route in Express is used to handle HTTP DELETE requests, which typically remove a resource from the server.

beginner

How do you define a DELETE route in Express?

Use app.delete('/path', (req, res) => { ... }) to define a DELETE route that listens for DELETE requests at the specified path.

beginner

In Express, how do you access the resource identifier in a DELETE route URL like '/items/:id'?

You access it via req.params.id inside the route handler function.

intermediate

What status code is commonly sent back after successfully deleting a resource in Express?

The status code 200 (OK) or 204 (No Content) is commonly sent to indicate successful deletion.

intermediate

Why is it important to handle errors in a DELETE route handler?

Handling errors ensures the server responds properly if the resource doesn't exist or deletion fails, improving reliability and user experience.

Which Express method is used to create a DELETE route?

A app.delete()

B app.remove()

C app.destroy()

D app.del()

app.delete() is the correct method to handle DELETE HTTP requests in Express.

How do you access the ID parameter in a DELETE route defined as '/users/:id'?

A req.params.id

B req.query.id

C req.body.id

D req.headers.id

Route parameters like ':id' are accessed via req.params.id in Express.

What HTTP status code indicates a successful deletion with no content returned?

A 200

B 204

C 201

D 404

204 No Content means the deletion was successful and no response body is sent.

Which of these is NOT a typical reason to send an error response in a DELETE route?

A Resource to delete does not exist

B Server database connection failure

C User lacks permission to delete

D Client sends a GET request instead

A GET request is handled by a GET route, not a DELETE route error.

What is the correct way to send a 404 error if a resource is not found in a DELETE route?

A res.sendStatus(200)

B res.status(500).send('Error')

C res.status(404).send('Not found')

D res.redirect('/error')

res.status(404).send('Not found') correctly sends a 404 status with a message.

Explain how to create a DELETE route in Express that deletes an item by ID.

Think about how to listen for DELETE requests and get the ID from the URL.

Describe why error handling is important in DELETE route handlers and how you might implement it.

Consider what happens if the item to delete is missing or the server fails.