MEAN Stack Development 3

Question 1

What is the role of `app.use()` in an Express.js application?

Accepted Answer

Mounts middleware at a specified path

Answer

app.use() mounts specified middleware functions at a given path, applying them to all matching incoming requests.

Question 2

Which Node.js module provides an interface for interacting with the file system?

Accepted Answer

fs

Answer

The built-in 'fs' (file system) module provides APIs for reading, writing, and manipulating files and directories.

Question 3

In MongoDB, what is the default name of the field used as a document's primary key?

Accepted Answer

_id

Answer

MongoDB automatically assigns a unique ObjectId to the _id field of every document unless you specify a custom value.

Question 4

What does Angular's `ngFor` structural directive do?

Accepted Answer

Iterates over a collection and renders a template for each item

Answer

ngFor is a structural directive that renders a template once for each item in an iterable collection.

Question 5

Which of the following is a key advantage of using JWT (JSON Web Tokens) for authentication in a MEAN stack app?

Accepted Answer

They are stateless, eliminating server-side session storage

Answer

JWTs are self-contained tokens that carry claims, allowing stateless authentication without maintaining server-side session stores.

MEAN - Stack Development Practice Test