Installing Node.js

This lesson covers Installing Node.js. Here is the idea in simple words, then we write real code.

What you will learn

• What installing node.js means — in normal words, not textbook words
• How it works step by step
• Code you can run today on your laptop
• Where teams use this in real projects

Before you start

• Software: Node.js LTS from nodejs.org, VS Code, and a terminal
• Knowledge: Lessons 1–2 in this course
• Previous lesson: Event-Driven Architecture — Complete Guide

Explain it simply

You need Node.js installed before you can run any server code. The installer includes npm (package manager) too.

Why developers use this

• node runs your .js files
• npm installs libraries like Express
• LTS versions are stable for learning and production

How it works (step by step)

1. You write JavaScript in a .js file about Installing Node.js.
2. You run it with node filename.js in the terminal.
3. Node prints output or starts a server depending on the lesson.
4. You change one line, run again, and see what changed — that is how you learn.

Code example — type this yourself

node -v
npm -v

Run these in PowerShell, Terminal, or CMD. You should see version numbers like v22.x and 10.x.

What each part does

• node -v — Line 1: runs as written.
• npm -v — Line 2: runs as written.

Real life: where Installing Node.js shows up

A startup team uses Installing Node.js when they bootstrap their first API. The developer runs a small script on a laptop, stores config in .env, and splits code into modules before the app grows. Start small: one feature working beats a perfect architecture on paper.

Try it yourself — hands-on

1. Download the LTS installer from https://nodejs.org
2. Run the installer (keep default options)
3. Open a new terminal and run node -v and npm -v

Common mistakes (avoid these)

• Installing an old tutorial that points to nodejs.org/en/download/ archive — always use the main LTS link.

Interview note

Interviewers often ask: “What is Installing Node.js?” Answer in one sentence, then give a tiny example you actually ran.

Summary

• Use the LTS build from nodejs.org
• npm comes with Node
• Restart the terminal after install