JWT Access + Refresh Token in Spring Security

Secure your Spring Boot REST API using JWT authentication with access + refresh tokens and a custom JWT filter. 🔐 In this in-depth tutorial, you’ll learn how to build a full JWT authentication system using Spring Boot 3 and Spring Security 6—from scratch. If you’re an experienced developer with strong Core Java theory but little hands-on Spring Boot experience, this is for you. In this practical, real-world project, I’ll walk you step-by-step through building a *stateless, secure JWT-based authentication system* with: ✅ Access Token + Refresh Token ✅ Role-Based Authorization (Admin/User) ✅ Token Expiry + Renewal ✅ Spring Security Integration ✅ Full CRUD API (Product Module) ✅ Filter Chains, Custom Filters, Auth Controllers ✅ Best Practices Used in Real Projects & Interviews 🎯 Whether you're building a modern Java backend, integrating with frontend frameworks like React or mobile apps, or preparing for interviews, this tutorial gives you the complete blueprint to build secure, stateless REST APIs. 🧠 *What You’ll Know by the End:* - How to configure Spring Security with JWT - How to generate, validate, and decode JWT tokens - How to implement user roles (ADMIN/USER) - How to protect endpoints with @PreAuthorize - How to issue new access tokens using refresh tokens ----- 🔗 BONUS 💻 Get 3 Months of IntelliJ IDEA Ultimate for FREE: https://www.jetbrains.com/store/redeem/ 👉 *Use Promo Code:* LearnWithIfte 🎯🎯 *Subscribe to my Newsletter:* https://learnwithiftekhar.substack.com/ ✅ For branding and Business inquiries ► [email protected] ► Join Discord: https://discord.gg/JZmFvSxw 👉 *Master programming by recreating your favorite technologies*: https://app.codecrafters.io/join?via=learnwithiftekhar 📘 Resources Mentioned: 🧑‍💻 Source Code: https://github.com/learnwithiftekhar/Spring-Security-JWT 🙊 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 ► Recommended Books Clean Code * https://amzn.to/3PS6Cjo Clean Architecture * https://amzn.to/4avYVZK Spring in Action * https://amzn.to/41eIqgf Refactoring: Improving the Design of Existing Code * https://amzn.to/3QBgBdq ► Computer and Monitor New Apple MacBook Pro * https://amzn.to/4atFbWJ ► Gear Microphone * https://amzn.to/4hbqw4U My Second Microphone: https://amzn.to/4gkhVvF ► Tool that I use for screen recording: CleanShot X for Mac * cleanshot.sjv.io/bODOab *CREDITS:* Computer icons: https://www.flaticon.com/free-icons/computer Filter icons: https://www.flaticon.com/free-icons/filte Identity icons: https://www.flaticon.com/free-icons/identity Magnifying glass icons: https://www.flaticon.com/free-icons/magnifying-glass User icons: https://www.flaticon.com/free-icons/user Linked icons: https://www.flaticon.com/free-icons/linked Delete icons: https://www.flaticon.com/free-icons/delete Success icons: https://www.flaticon.com/free-icons/success Plus icons: https://www.flaticon.com/free-icons/plus Search icons: https://www.flaticon.com/free-icons/search Pencil icons: https://www.flaticon.com/free-icons/pencil Red icons: https://www.flaticon.com/free-icons/red IDE I use for coding * IntelliJ Idea Ultimate 🤚 In case you want to contact me: ❌ My LinkedIn profile: https://www.linkedin.com/in/hossain-md-iftekhar/ ❌ 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. #SpringBoot #SpringSecurity #JWT #JavaDeveloper #RESTAPI #BackendDev #SecureAPI #TokenAuth #RefreshToken #fullstackjava Intro: 00:00:00 Intro 00:01:43 What You’ll Build in This Tutorial 00:03:35 Project Setup 00:06:07 Add Spring Boot Dependencies 00:07:45 Adding JWT Dependencies 00:10:15 Spring Boot Project Structure Explained 00:11:55 Run project for the first time 00:14:24 Connect Spring Boot to PostgreSQL 00:20:11 Creating Package Structure 00:20:46 Building the Product Entity 00:22:44 Creating Product Repository 00:23:10 Implementing the Service Layer 00:25:11 Implementing RESTful Endpoints 00:26:15 Testing Our First Endpoint 00:28:05 Implementing CRUD Endpoints 00:31:18 Creating the User Entity & Role Enum 00:34:15 Building the User Repository 00:35:20 Implementing UserDetailsService 00:37:51 Creating the Auth Controller 00:38:40 Registration DTO & Validation 00:40:22 Setting Up the Auth Service 00:40:49 Implementing User Registration 00:43:04 Configuring Spring Security 00:49:48 Understanding Spring Security Flow 00:53:46 Creating the JWT Service 00:55:28 JWT Configuration Properties 00:58:00 Access Token Generation 00:59:53 Refresh Token Implementation 01:03:03 JWT Token Validation Logic 01:06:53 Building the JWT Authentication Filter 01:12:18 Implementing Login Functionality 01:31:03 Refresh Token Workflow 01:36:15 Final Words