How Authentication Works: JWT vs Sessions Explained

Authentication is a fundamental part of modern web applications. Whether you’re logging into a social platform, accessing an API, or using a dashboard, authentication determines who you are and whether you’re allowed to access certain resources. Two of the most commonly used authentication approaches in web development are Session-Based Authentication and JWT (JSON Web Token) Authentication. Both methods solve the same problem—verifying user identity—but they work in very different ways. In this article, we’ll break down how authentication works, how sessions differ from JWTs, and when to use each approach. What Is Authentication? Authentication is the process of verifying a user’s identity before granting access to a system. For example, when a user logs into a website: The user enters credentials (email/password) The server verifies those credentials The server creates a way to remember the user’s identity for future requests The third step is where sessions or JWT tokens come into p