HTTP methods and CRUD mapping in Node.js - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Mapping HTTP methods to CRUD operations

Which HTTP method is correctly paired with the Update operation in CRUD?

A PUT

B POST

C GET

D DELETE

💡 Hint

Think about which method replaces or modifies existing data.

PUT is used to update or replace existing resources, matching the Update operation in CRUD.

❓ component_behavior

intermediate

Behavior of HTTP DELETE method

What is the expected behavior when a server receives an HTTP DELETE request for a resource?

A The server creates a new resource.

B The server removes the specified resource.

C The server retrieves the resource data.

D The server updates the resource partially.

💡 Hint

DELETE is about removing something.

DELETE requests instruct the server to remove the specified resource.

📝 Syntax

advanced

Correct HTTP method for partial update

Which HTTP method is designed for partial updates of a resource?

A PATCH

B PUT

C POST

D GET

💡 Hint

It modifies only parts of a resource, not the whole.

PATCH is used for partial updates, unlike PUT which replaces the entire resource.

❓ state_output

advanced

Result of GET request on a resource

What is the typical result of a successful HTTP GET request to a resource endpoint?

A A new resource is created and its ID is returned.

B The resource is updated with new data.

C The resource data is returned without modifying it.

D The resource is deleted and a confirmation is returned.

💡 Hint

GET is used to read data, not change it.

GET requests retrieve resource data without changing the server state.

🔧 Debug

expert

Identify the incorrect HTTP method for Create operation

Which HTTP method is incorrectly used for creating a new resource?

Node.js

const express = require('express');
const app = express();

app.post('/items', (req, res) => {
  // Create new item logic
  res.status(201).send('Created');
});

app.get('/items', (req, res) => {
  // List items logic
  res.send('List');
});

app.put('/items', (req, res) => {
  // Intended to create new item but used PUT
  res.status(201).send('Created with PUT');
});

A GET is used to create a new resource, which is incorrect.

B POST is the correct method to create a new resource.

C PUT can be used to create a resource but only at a specific URL.

D PUT used without specifying resource ID is incorrect for creation.

💡 Hint

PUT on a collection endpoint like /items is incorrect for creation.

PUT is typically used for full replacement or conditional creation at a specific resource URL (e.g., /items/123). Using PUT on a collection endpoint like /items for creation is non-standard; POST is the standard method.