1 / 14

Learn NodeJS from Scratch

Hello! Welcome

Let’s explore Node.js from scratch.

What is Node.js?

Node.js is a runtime environment for JavaScript. That is, it is a program that executes code in JavaScript.

Before NodeJS, JavaScript was used almost exclusively in a web browser.

Why use Node.js?

Node.js is ideal for building web applications and servers that handle many connections at the same time.

But it is also an essential tool in modern web development, as it has tools that make programming much easier.

What is NPM?

NPM is the package manager for Node.js. It allows you to install and manage additional libraries and tools.

Packages are collections of modules that you can add to your project.

You’re doing great!

Now let’s talk about hardware.

Installing Node.js

To start using Node.js, you first need to install it on your computer.

You can download Node.js from its official page.

It’s that easy!

Getting Started with Node.js

Node.js is a command line tool. That is, you “use” it through commands typed in a terminal.

For example, you can run your JavaScript code in Node.js using the command node.

Modules in Node.js

Node.js uses modules to organize code. They can be your own modules or created by others.

Node.js comes with a series of built-in modules that allow us to interact with the file system, networks, and much more.

You’re almost there!

We just need to see how to use NodeJS.

Creating a Basic Server

Node.js allows you to create web servers. A basic server can respond to requests and send responses using JavaScript.

File Handling

Node.js has modules for reading and writing files, which allows you to manipulate data in the file system.

Additionally, Streams allow you to process large amounts of data in chunks, rather than loading everything into memory.

Other Packages

But there’s so much more! Node.js includes many modules for tasks such as:

TCP, UDP, WebSocket communications
Databases
Security and cryptography

So just explore each of them little by little!

Errors and Testing

Node.js includes tools for debugging your code, helping you find and fix issues.