JavaScript from Scratch: Where to Start in 2025 — A Beginner's Guide

Introduction: Why JavaScript is Your Ideal Start in 2025

JavaScript has remained the most in-demand programming language in the world for many years. In 2025, it not only holds its ground but becomes even more powerful thanks to the constant evolution of its ecosystem. If you've decided to start learning programming, JavaScript is an excellent choice.

Why JavaScript? First, practically every modern website runs on it. Second, with Node.js, you can write not only frontend but also server applications, bots, utilities, and even desktop programs. Third, the entry barrier is very low: for your first steps, you only need a browser and a text editor.

In this article, we'll break down where to start learning JavaScript in 2025, install Node.js, write our first programs, and cover the key concepts of the language.

1. Installing and Setting Up the Environment (Node.js)

In 2025, the de facto standard for running JavaScript outside the browser is Node.js. This is a runtime environment that allows you to use JS for server-side development, writing scripts, and automation.

How to Install Node.js

1. Go to the official website nodejs.org.
2. Download the LTS version (Long Term Support) — it is the most stable.
3. Run the installer and follow the instructions (it is recommended to leave all settings at default).
4. After installation, open a terminal (command line) and check the version:

node --versionnpm --version

If you see version numbers, everything is ready to go. npm is a package manager that will be useful for installing libraries.

Your First Script on Node.js

Create a file hello.js and write in it:

console.log("Hello, JavaScript world!");console.log("Learning to program in 2025!");

Run the script with the command in the terminal:

node hello.js

You will see the greeting in the console. Congratulations — you have just written and executed your first program in JavaScript!

2. Syntax Basics: Variables, Data Types, and Functions

Now that the environment is ready, let's cover the fundamental concepts. In 2025, it is recommended to use modern ES6+ syntax.

Variables: let, const, and var

In modern JavaScript, let and const are used to declare variables. The var keyword is considered outdated.

• const — for values that should not change (constants).
• let — for variables that can change.

const userName = "Alexey";let age = 25;

console.log(`Hello, ${userName}! You are ${age} years old.`);

age = 26; // Works, because letconsole.log(`Now you are ${age} years old.`);

// userName = "Maria"; // Error! const cannot be reassigned

Data Types

JavaScript is a dynamically typed language. The main types are:

• Number — numbers (integers and floats)
• String — text strings
• Boolean — true/false
• null and undefined
• Object — objects and arrays

let number = 42;let text = "JavaScript";let isReady = true;let empty = null;let notDefined;

console.log(typeof number);   // "number"console.log(typeof text);     // "string"console.log(typeof isReady);  // "boolean"console.log(typeof empty);    // "object" (historical JS bug)console.log(typeof notDefined); // "undefined"

Functions

Functions are reusable blocks of code. In modern JS, arrow functions are most often used