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Introduction to Node.js

Introduction to Node.js

Content

Introduction-to-Node.js
Key-Features
How-Does-Node.js-Work
Hello-World-Example
Activity

Updated on 10/09/2024
450 Views

What is Node.js?

Node.js is a runtime environment that lets you run JavaScript on the server side. It allows you to build scalable network applications and handle many connections simultaneously.

Key Features

Asynchronous and Event-Driven

Node.js uses non-blocking, event-driven architecture, which makes it efficient and scalable.

Single Programming Language

With Node.js, you can use JavaScript for both server-side and client-side development.

NPM (Node Package Manager)

NPM is a package manager that comes with Node.js, allowing you to easily install and manage libraries and tools.

How Does Node.js Work

Event Loop

Node.js operates on a single-threaded event loop that handles requests asynchronously.

Non-Blocking I/O

It processes I/O operations (like reading files or querying databases) without blocking other operations.

Hello World Example

Activity

Set up Node.js on your computer and run the 'Hello World' example to start a basic web server.

Quiz

1. What is Node.js primarily used for?

a) Client-side scripting
b) Server-side programming
c) Database management
d) Graphics rendering

2. What does the event loop in Node.js do?

a) Handles multiple threads
b) Executes JavaScript code synchronously
c) Manages asynchronous operations
d) Compiles JavaScript code

3. What is the purpose of NPM in Node.js?

a) To compile JavaScript
b) To manage packages and dependencies
c) To debug Node.js applications
d) To write JavaScript code

4. Which method is used to create a basic HTTP server in Node.js?

a) http.createServer()
b) http.listen()
c) server.start()
d) server.create()

5. What will the following code output?

a) Hello, Node.js World!
b) Hello, JavaScript World!
c) Hello, World!
d) Node.js Hello World!