'🔐 Spring Security Explained Line-by-Line | Internal Working with JWT + Diagram | Java Full Stack

Welcome to another powerful Java Full Stack tutorial! 🚀
In this video, we’ll dive deep into **Spring Security with JWT** – from login to token generation to authentication filter – all explained line-by-line with diagrams.

📌 What you will learn:
00:00 - Introduction
01:30 - Spring Security Architecture
03:00 - JWT Token Generation Logic
05:15 - JwtAuthFilter Explained
08:00 - JwtUtils Explained (v0.12.6 compatible)
10:00 - SecurityConfig Setup
12:30 - Common 401 & 403 Errors Solved
15:00 - Spring Security Internal Flow Explained Visually
18:00 - Postman Testing with JWT

✅ Covered:
- AuthenticationManager & BCryptPasswordEncoder
- UserDetailsService Implementation
- JWT Token Creation & Validation
- JwtAuthFilter Logic & Flow
- Secure API using Spring Boot + Spring Security + JWT

📘 Technologies Used:
Java 17, Spring Boot 3, Spring Security, JWT 0.12.6, Maven, Postman

🎓 Perfect for:
Beginner to Advanced Java Developers, Spring Boot learners, API Security focused devs

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