Go beyond Django's built-in auth — learn JWT, custom email login, role-based permissions, and brute-force protection.

Django Authentication Deep Dive: JWT, Sessions, and Custom Backends Go beyond Django's built-in auth — learn JWT, custom email login, role-based permissions, and brute-force protection. Intermediate | Read Time: 12 min | Author: [SRI BALU] Introduction Authentication is the backbone of almost every web application. Django ships with a solid built-in auth system — but in real-world projects, you'll quickly outgrow it. Whether you're building a REST API, a multi-tenant SaaS, or a social login platform, understanding Django's authentication internals gives you the power to customize it exactly how you need. In this deep-dive, we'll cover: How Django's authentication system works under the hood Session-based vs JWT-based authentication Implementing JWT authentication with djangorestframework-simplejwt Writing a custom authentication backend (e.g., login with email instead of username) Securing your endpoints with permissions 1. How Django Authentication Works Under the Hood Before writing