HTTP methods for CRUD operations in Express - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

Identify the HTTP method for creating a new resource

In an Express app, which HTTP method is typically used to create a new resource on the server?

A GET

B POST

C DELETE

D PUT

💡 Hint

Think about which method sends data to the server to add something new.

The POST method is used to send data to the server to create a new resource. GET is for fetching data, PUT is for updating, and DELETE is for removing.

❓ component_behavior

intermediate

Choose the HTTP method for updating an existing resource

Which HTTP method should you use in Express to update an existing resource completely?

A GET

B POST

C PATCH

D PUT

💡 Hint

This method replaces the entire resource with new data.

PUT replaces the entire resource with the data sent. PATCH is for partial updates, POST is for creating, and GET is for reading.

📝 Syntax

advanced

Identify the correct Express route for deleting a resource

Which Express route correctly handles deleting a resource by its ID?

A app.delete('/items/:id', (req, res) => { /* delete logic */ })

B app.get('/items/:id', (req, res) => { /* delete logic */ })

C app.post('/items/:id', (req, res) => { /* delete logic */ })

D app.put('/items/:id', (req, res) => { /* delete logic */ })

💡 Hint

Deleting a resource uses a specific HTTP method matching the route.

app.delete defines a route that listens for DELETE requests, which is the correct method for deleting resources. Other methods are for different actions.

❓ state_output

advanced

What is the response status code after a successful resource update?

In Express, after successfully updating a resource with PUT, which HTTP status code is most appropriate to send back?

A 200 OK

B 201 Created

C 204 No Content

D 404 Not Found

💡 Hint

The resource exists and was updated successfully.

200 OK means the update was successful and the server is returning the updated resource or confirmation. 201 is for creation, 204 means success with no content, and 404 means resource not found.

🧠 Conceptual

expert

Understanding idempotency in HTTP methods for CRUD

Which HTTP method used in CRUD operations is idempotent, meaning multiple identical requests have the same effect as one request?

A POST

B PUT

C PATCH

D DELETE

💡 Hint

Idempotent methods do not change the result if repeated multiple times.

PUT is idempotent because updating a resource with the same data multiple times results in the same state. POST is not idempotent because it creates new resources each time. PATCH may not be idempotent depending on the patch. DELETE is idempotent because deleting the same resource multiple times has the same effect as deleting once.