JWT Access + Refresh Token in Spring Security
Secure your Spring Boot REST API using JWT authentication with access + refresh tokens and 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
🎯 Who This Is For:
Professionals wanting hands-on experience
Spring Boot beginners looking for real project guidance
Anyone preparing for backend interviews with JWT questions
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#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
