How JWT Works (No Sessions Needed) | Node.js Demo

How JWT Works (No Sessions Needed) | Node.js Demo

Ever wondered how websites keep you logged in without storing sessions on the server?

In this video, we break down JWT (JSON Web Token) — a powerful way to handle authentication in modern applications.

You’ll learn:
- The problem with session-based authentication
- What JWT is and how it works
- How tokens are generated and validated
- Header, Payload, and Signature explained
- Why JWT is stateless and scalable
- A simple Node.js demo

By the end of this video, you’ll clearly understand how authentication works without storing data on the server.

Why this matters:
JWT is widely used in APIs, authentication systems, and modern web applications.

Key takeaway:
JWT allows the server to verify users without storing sessions, making systems faster and more scalable.

💻 Code:
https://github.com/aniruddhasm/how-systems-work/blob/develop/12-jwt/index.js

🔥 Subscribe for more “How Systems Work” videos:
https://www.youtube.com/@aniruddhamahamuni

#jwt, #jwtexplained, #authentication, #nodejsjwt, #stateles, #backendengineering, #systemdesign, #websecurity

Видео How JWT Works (No Sessions Needed) | Node.js Demo канала Aniruddha Mahamuni