Question 1

What is the significance of the 'npm' command in Node.js?

Accepted Answer

npm (Node Package Manager) is the default package manager for Node.js, used to install, manage, and share dependencies.
- Installs packages listed in package.json.
- Runs scripts for tasks like testing or building.
- Powers the vast npm ecosystem for rapid development.

Question 2

What is the difference between 'let', 'const', and 'var' in Node.js?

Accepted Answer

These are JavaScript variable declarations, used in Node.js.
- 'var' is function-scoped, hoisted, and reassignable.
- 'let' is block-scoped and reassignable.
- 'const' is block-scoped, immutable (but object properties can change).
- Modern Node.js favors let/const.

Question 3

What is the 'http' module’s role in Node.js?

Accepted Answer

The 'http' module enables Node.js to create servers and make HTTP requests.
- Core for building REST APIs or web servers.
- Supports low-level request/response handling.
- Often wrapped by frameworks like Express.
- Lightweight and flexible.

Question 4

What is the role of the module.exports object in Node.js?

Accepted Answer

module.exports is how you expose functionality from a Node.js module to other parts of your app. By default, it’s an empty object, but you can assign functions, objects, or values to it.
- It’s the key to Node’s module system.
- Use exports as a shorthand, but module.exports overrides it.
- Essential for code modularity.

Question 5

What is the role of the 'fs' module in Node.js?

Accepted Answer

The 'fs' (File System) module provides APIs to interact with the file system, like reading, writing, or deleting files.
- Offers both synchronous and asynchronous methods.
- Used for tasks like logging, config management, or file uploads.
- Essential for server-side file operations.

Question 6

What is the purpose of 'npx' in Node.js?

Accepted Answer

npx is a tool bundled with npm to run Node.js packages.
- Executes binaries without global install (e.g., npx create-react-app).
- Runs specific package versions on-demand.
- Simplifies one-off commands.
- Enhances workflow flexibility.

Question 7

How do you serve static files in a Node.js application?

Accepted Answer

Static files (HTML, CSS, images) are served using Express’s static middleware.
- Point to a directory with express.static().
- Simplifies hosting front-end assets.
- Can be cached or prefixed with routes.
- Efficient for web apps.

Question 8

How do you use middleware to parse JSON in Express?

Accepted Answer

Express parses JSON request bodies with built-in middleware.
- Use express.json() to handle Content-Type: application/json.
- Makes req.body available as an object.
- Essential for REST APIs.
- Limits can prevent large payload attacks.

Question 9

What are the advantages of using Node.js?

Accepted Answer

Node.js offers several benefits that make it popular for modern apps.
- It’s fast due to the V8 engine and non-blocking I/O.
- Great for real-time apps like chat or gaming.
- Uses JavaScript everywhere, reducing context-switching for developers.
- Has a massive ecosystem via npm for quick development.

Question 10

What is the difference between 'blocking' and 'non-blocking' in Node.js?

Accepted Answer

Blocking (synchronous) code halts execution until complete, while non-blocking (asynchronous) code runs in the background, freeing the thread.
- Blocking: fs.readFileSync waits for the file.
- Non-blocking: fs.readFile uses callbacks.
- Non-blocking is key to Node.js’s efficiency.

DeVlt

Easy Node Interview Questions

Unlock All Interview Questions

Why Practice Easy Node Questions?

DeVlt