Full-Stack Development Developer 2

Question 1

Which HTTP status code should a REST API return when a resource is successfully created?

Accepted Answer

201 Created

Answer

201 Created indicates that the request succeeded and a new resource was created as a result.

Question 2

In a Node.js application, what does the `process.env` object provide?

Accepted Answer

Access to environment variables

Answer

`process.env` exposes environment variables set in the operating system or `.env` files to the Node.js process.

Question 3

What is the purpose of database indexing in full-stack applications?

Accepted Answer

To speed up query performance on searched columns

Answer

Indexes create data structures that allow the database engine to find rows faster without scanning the entire table.

Question 4

Which React hook should you use to run a side effect only once when a component mounts?

Accepted Answer

useEffect with an empty dependency array

Answer

Passing an empty array `[]` as the second argument to `useEffect` ensures it runs only after the initial render.

Question 5

What does CORS stand for and why is it relevant to full-stack development?

Accepted Answer

Cross-Origin Resource Sharing; controls which domains can access your API

Answer

CORS is a browser security mechanism that restricts web pages from making requests to a different domain than the one that served the page.

Full-Stack Development Practice Test