Build a Secure Login System in JavaScript with Password Validation, Session Expiry & Logout Protection

Build a Secure Login System in JavaScript with Password Validation, Session Expiry & Logout Protection

In modern web development, authentication systems are one of the most important components of any application. Whether you are building a simple website, an admin dashboard, or a full e-commerce platform, you need a secure login system. In this tutorial, you will learn how to build a secure login system using JavaScript with important features such as password validation, session handling, session expiry, and secure logout functionality. This project is designed for beginners and intermediate learners who want to understand how authentication works in real-world applications. 🔐 1. Understanding How Login Systems Work Before writing code, it is important to understand how authentication works in real applications. A login system typically has three main steps: User Input: The user enters username and password Validation: The system checks if input is correct Session Creation: If valid, user login state is stored In real applications, authentication is handled by a backend server. How…