Implement JWT Authentication in Spring Boot 3 Without External Libraries

🚀 Generate HS256 JWTs in Spring Boot 3 without 3rd-party libs! Learn native token auth with MySQL. 💻 Dive into a cleaner, more fundamental way to implement JWT-based authentication using Spring Security's built-in capabilities and standard Java. Many tutorials rely on external libraries for JWTs. This video takes a different path, showing you how to leverage what Spring Boot and Java offer natively for HS256 token generation and preparing for validation, backed by a real MySQL database for user credentials. 🛠️ In this comprehensive, step-by-step tutorial, you will learn how to: * ⚙️ Set up a Spring Boot 3 project with essential dependencies (Spring Web, Spring Data JPA, MySQL Driver, OAuth2 Resource Server for JWT foundations, Validation). * 💾 Configure a MySQL database connection and schema. * 👤 Create a User entity, Role enum, UserRepository, and a UserService implementing UserDetailsService for database authentication. * 🔑 Generate a secure HS256 secret key (using OpenSSL) and manage it in application.properties. * 🔧 Implement JwtEncoder and JwtDecoder beans using Nimbus JOSE+JWT within Spring Security's configuration (SecurityConfig). * 🔐 Configure SecurityFilterChain to protect endpoints and set up JWT processing via oauth2ResourceServer. * 🚪 Build a /login endpoint in an AuthController that authenticates users (with AuthenticationManager) against the database. * ✨ Create a JwtService to generate HS256 tokens with claims (issuer, issuedAt, expiresAt, subject). * 🌱 Seed a demo user with an encoded password using CommandLineRunner for easy testing. * 🧪 Thoroughly test the login flow, token generation, and access to protected endpoints using Postman, including debugging common issues. * 👤 Display authenticated user details from the security context. * 💻 Technologies Covered: Java ☕ * Spring Boot 3 🌱 * Spring Security (OAuth2 Resource Server for JWT handling) * Spring Data JPA * MySQL 🐬 * HS256 (Symmetric Key JWTs) * Nimbus JOSE + JWT (via Spring Security beans) * OpenSSL (for key generation) * Postman 📮 Image credit: Padlock icons created by Freepik - Flaticon https://www.flaticon.com/free-icons/padlock Spring data jpa: https://www.youtube.com/watch?v=svIHeqwrhZk 🔗 BONUS 💻 Get 3 Months of IntelliJ IDEA Ultimate for FREE: https://www.jetbrains.com/store/redeem/ 👉 *Use Promo Code:* LearnWithIfte ✅ For branding and Business inquiries ► learnwithiftekhar@gmail.com ► Join Discord: https://discord.gg/JZmFvSxw 📘 Resources Mentioned: 🧑‍💻 Source Code: https://github.com/learnwithiftekhar/spring-jwt-with-spring-security 🔐 Secure 3 Spring Boot endpoints in 30 minutes (free guide): https://learnwithiftekhar.kit.com/secure-your-api-in-30-minutes 🙊 Here are the tools and resources I use in my videos: 👉 Master programming by recreating your favorite technologies: https://app.codecrafters.io/join?via=learnwithiftekhar ► Tool that I use for screen recording: CleanShot X for Mac * cleanshot.sjv.io/bODOab ⛔ Background sound: https://share.epidemicsound.com/ia954g 💻 *Running Windows on Mac? Get Parallels Desktop with a 20% discount!* 👉 *Use code PARALLELS20 and grab it here:* https://parallels.sjv.io/bOVD3M IDE I use for coding * IntelliJ Idea Ultimate * VsCode * Sublime 🌐 Secure your connection with NordVPN: https://nordvpn.sjv.io/o4zYan 🤚 In case you want to contact me: ❌ My LinkedIn profile: https://www.linkedin.com/in/hossain-md-iftekhar/ ❌ My X / Twitter profile: https://twitter.com/ifte_hsn ❌ Github: Github: https://github.com/learnwithiftekhar *Note:* Some of the links in this description are affiliate links, and I may earn a small commission if you make a purchase through them. Thank you for your support.