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

POST

Answer

PATCH

Answer

DELETE

Question 2

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

Accepted Answer

201 Created

Answer

200 OK

Answer

204 No Content

Answer

202 Accepted

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

Content Origin Response System — caches API responses at the CDN level

Answer

Cross-Object Routing Service — maps URLs to controller methods

Answer

Client-Origin Request Schema — validates request payloads

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

NestJS

Answer

Fastify

Answer

Hapi

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

To compile TypeScript before the server starts

Answer

To cache database query results

Answer

To manage environment variables

Question 6

What does GraphQL provide over a traditional REST API?

Accepted Answer

Clients can request exactly the fields they need, reducing over-fetching and under-fetching

Answer

Faster response times due to binary encoding

Answer

Automatic database schema generation

Answer

Built-in authentication and authorization