Full-Stack Development Full-Stack Development Backend Systems & API Design

Question 1

Which HTTP method is considered idempotent and is used to retrieve a resource without modifying it?

Accepted Answer

GET

Answer

GET is idempotent and safe — it retrieves a resource without causing side effects, meaning repeated calls return the same result.

Question 2

In RESTful API design, what HTTP status code indicates that a new resource was successfully created?

Accepted Answer

201 Created

Answer

201 Created is the standard response for a successful POST request that results in the creation of a new resource on the server.

Question 3

What does CORS stand for and why is it important in full-stack development?

Accepted Answer

Cross-Origin Resource Sharing — controls which domains can make requests to your API

Answer

CORS is a browser security mechanism that restricts cross-origin HTTP requests, requiring servers to explicitly allow requests from different domains.

Question 4

Which Node.js framework is most commonly used to build RESTful APIs due to its minimal and unopinionated design?

Accepted Answer

Express.js

Answer

Express.js is the most widely used Node.js web framework, known for its minimalist design, middleware system, and large ecosystem.

Question 5

What is the purpose of HTTP middleware in an Express.js application?

Accepted Answer

To intercept and process requests/responses in a pipeline before reaching the route handler

Answer

Middleware functions in Express execute in order on each request, allowing you to add logging, authentication, parsing, and error handling before route handlers run.

Full-Stack Development Practice Test

Full-Stack Development Practice Test

Full-Stack Development Full-Stack Development Backend Systems & API Design