JavaScript Environment Setup

You do not need to install anything big to start JavaScript. Every browser can already run it. Here are the three easy ways.

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1. The browser console (quickest)

• Open Chrome, Firefox or Edge.
• Press F12 (or Ctrl + Shift + J, Cmd + Option + J on Mac) and click the Console tab.
• Type 2 + 3 and press Enter. The console shows 5.

The console is perfect for small tests.

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2. An HTML file with a script

Install a code editor like VS Code, create a file named index.html and write:

<!DOCTYPE html>
<html lang="en">
<head>
  <title>My JavaScript Page</title>
</head>
<body>
  <h1>Hello</h1>

  <script>
    console.log("It works!");
  </script>
</body>
</html>

Open the file in the browser, open the Console, and you will see It works!.

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3. An external JavaScript file

For real projects keep JavaScript in its own file, and link it before the closing </body> tag, or in the head with defer.

<script src="app.js" defer></script>

// app.js
console.log("Loaded from app.js");

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Optional: Node.js

Node.js runs JavaScript outside the browser. Install it from nodejs.org, save code in a file like app.js and run it from the terminal.

node app.js

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Summary

• Use the browser console for quick tests.
• Use an HTML file with a <script> tag, or an external .js file, for real work.
• Next: JavaScript Basic Program.

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Exercises & Assignments
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Interview Questions & Answers
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