What is JWT token authentication | Authentication and Authorization - Full Explained

🔐 What is JWT Token?
JWT (JSON Web Token) is a compact, URL-safe token used to securely transmit information between parties. It is commonly used in authentication and authorization processes.

https://tutorialrays.in/understanding-jwt-tokens-and-their-role-in-web-applications/

A typical JWT has three parts:

Header – contains the signing algorithm (e.g., HS256).

Payload – holds user data or claims (e.g., user ID, roles).

Signature – verifies the token’s integrity and authenticity.

JWTs are signed, not encrypted, meaning anyone can read the payload but not alter it.

✅ What is Authentication?
Authentication is the process of verifying the identity of a user or system.

Example:

When a user logs in with their username and password, the server verifies the credentials and issues a JWT token.

✅ What is Authorization?
Authorization determines what actions a user is allowed to perform after they’ve been authenticated.

Example:

A user with a JWT token may be allowed to view their profile but not access admin routes unless their token includes the “admin” role.

🔁 Summary:
Authentication: Who are you?

Authorization: What can you do?

JWT: A token that proves authentication and may carry authorization data.

🎬 YouTube Short Title:
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📄 YouTube Description:
Ever wondered what a JWT token is? 🔐 Learn the difference between Authentication & Authorization and how JWT secures web applications. Perfect for developers & tech enthusiasts! 💻
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