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Introduction to JavaScript

22 Mar, 2026

Introduction to JavaScript

What's JavaScript

JavaScript is a high‑level programming language for creating interactive and dynamic websites. You can implement form validation functions , responsive menus, and animated elements using the language.The power of JavaScript comes from allowing websites to react immediately to user actions without reloading the page. With environments like Node.js, JavaScript allows server‑side development to create full‑stack applications. The versatility of JavaScript and extensive ecosystem have made the language a cornerstone in developing modern web applications.

History of JavaScript

JavaScript was created in 1995 by Brendan Eich at Netscape to make web pages interactive, and it quickly evolved into the standardized language known as ECMAScript. Over the decades, JavaScript has grown from a simple browser scripting tool into one of the most influential programming languages powering both client‑side and server‑side applications.

Early JavaScript Development (1995–1997)

JavaScript Growth and Standardization (1997–2009)

Modern JavaScript Era (2015–Present)

JavaScript Influence and Legacy

Quick JavaScript Timeline

Year Event
1995 Brendan Eich creates JavaScript at Netscape
1997 Standardized as ECMAScript (ES1)
1999 ES3 released, widely adopted
2005 AJAX revolutionizes web apps
2009 ES5 stabilizes language
2015 ES6 introduces modern features
2015+ Annual ECMAScript updates
Present Used in browsers, servers, mobile, IoT

JavaScript Syntax

You can write JavaScript code from a text editor like Notepad and run it inside a web browser by saving the file with an .html extension. This is the simplest way to get started with JavaScript because the browser can directly interpret both HTML and JavaScript together.

Follow the steps below to run your first JavaScript code.

  1. Open Notepad (or any basic text editor).

  2. Copy the code below into the editor.

    HTML
    <!DOCTYPE html>
<html>
<head>
  <title>Hello World App</title>
</head>
<body>    
  <h1 id="message"></h1>
  <script>    
    document.getElementById("message").textContent = "Hello World";
  </script>
</body>
</html>

  3. Save the file as hello.html and ensure the extension is .html, not .txt.

  4. Double‑click the file, and it will automatically open in your default browser.
  5. You will see the message Hello World displayed on the page.

This small exercise shows how JavaScript runs directly in the browser, instantly updating the page without reloading. It’s the classic first step in learning how to make websites interactive. The code works as follows:

  • Database
  • Database