What is JWT? Json Web Token Explained and Coded from Scratch | NodeJS, Express, JSON WEB TOKEN

JWT Explained in Telugu 🔐
Understand how JSON Web Token works, its structure, real login flow, and the biggest problem with JWT.

Commands Used:
npm init
npm install express jsonwebtoken cors body-parser

Websites visited in this Video:
https://www.jwt.io/
https://www.epochconverter.com/

In this video, we clearly explain JSON Web Token (JWT) from scratch using a real-world scenario.

If you are confused about:
What JWT actually is
Why JWT is used after login
How JWT works between client and server
JWT structure (Header, Payload, Signature)
Why JWT alone is not enough
What major problem exists with JWT

Then this video is for you.

📌 Topics covered in this video:
What is JWT? (JSON Web Token)
Why we use JWT
Structure of JWT (Header.Payload.Signature)
How JWT works (client ↔ server flow)
Role-based access example (Student / Faculty)
Major issue with JWT (cannot revoke)
Why Refresh Token is required (intro)

📄 FREE NOTES USED IN THIS VIDEO:
I have shared my complete JWT notes (PDF) that I used while explaining this video.
👉 Checkout our Telegram channel for Resources:
Telegram: https://t.me/tech_jashwanth
Instagram:   / tech_jashwanth  
Youtube:    / @techjashwanth  

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These notes include:
Diagrams
Step-by-step JWT flow
Interview-friendly explanations


🚀 This is PART 2 of Authentication Series
Previous video: Login Explained
Next video: Refresh Token Explained in Telugu

👍 If this video helped you, LIKE & SUBSCRIBE for backend content in Telugu.

timestamp:
00:54 Understanding JWT
06:00 JWT Structure
07:40 How JWT Works?
11:00 Implementing JWT in NodeJS
24:50 JWT Header, Payload and Signature
33:44 Middleware
45:05 JWT Drawbacks
47:55 Code Summary

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