Updating documents in Express - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the common method used in Express to update a document in a database?

The common method is using HTTP PUT or PATCH requests handled by Express routes, which then call database update functions.

intermediate

In Express, what is the difference between PUT and PATCH when updating documents?

PUT replaces the entire document, while PATCH updates only specified fields.

beginner

How do you access data sent by the client to update a document in Express?

You access data from the request body using middleware like express.json() and then use req.body in your route handler.

beginner

What is a typical Express route handler signature for updating a document?

It usually looks like: app.put('/items/:id', (req, res) => { /* update logic */ }); where :id is the document identifier.

intermediate

Why is it important to validate data before updating documents in Express?

Validating data ensures only correct and safe data updates the document, preventing errors and security issues.

Which HTTP method is typically used in Express to update part of a document?

A POST

B GET

C DELETE

D PATCH

PATCH is used to update parts of a document, while GET retrieves data, POST creates, and DELETE removes.

How do you parse JSON data sent in the request body in Express?

A Using express.json() middleware

B Using express.urlencoded() middleware

C Using body-parser deprecated package only

D No middleware needed

express.json() middleware parses incoming JSON request bodies so you can access data via req.body.

In Express, where do you find the document ID when updating a document via URL?

A req.body

B req.params

C req.query

D req.headers

req.params contains route parameters like :id used in the URL path.

What should you do before updating a document with user data in Express?

A Delete the document first

B Ignore validation

C Validate the data

D Send a GET request

Validating data prevents invalid or harmful data from corrupting the document.

Which Express method handles full replacement of a document?

A PUT

B PATCH

C GET

D POST

PUT replaces the entire document, while PATCH updates parts of it.

Explain how to set up an Express route to update a document using the PATCH method.

Think about how the route, middleware, and request data work together.

Describe why validating user input is important before updating documents in Express applications.

Consider both technical and user experience reasons.