AuthKit

AuthKit — Spring Boot JWT Authentication Boilerplate

Build secure, production-ready authentication into your Spring Boot app in minutes — not days.

I built AuthKit to save you from the repetitive and error-prone parts of auth: wiring up JWTs, refresh tokens, role-based guards, and consistent error handling. If you need a solid, extendable auth foundation that’s easy to drop into a new project (or use as a learning reference), this is it.

Why this boilerplate?

Most auth examples either skip refresh tokens, mix responsibilities across layers, or leave you guessing how to handle errors and role rules. AuthKit gives you a clean, opinionated starting point:

• Real JWT access + refresh token flow (with rotation and logout)
• Role-based access control (USER / ADMIN) out of the box
• Centralized, consistent error responses so clients can parse failures reliably
• Ready-made Postman collection and seed data so you can test immediately

If you want to spend less time wiring security and more time building features — AuthKit is a practical, ready-to-use solution.

What’s included

• Full Spring Boot project (source code) — production-ready structure
• JWT access token + refresh token implementation
• Role-based endpoints and example controllers/services
• Global exception handler with consistent JSON error format
• DataInitializer for roles + sample users (admin/user)
• Postman collection (plug-and-play) with login/refresh/logout scripts
• application.properties guidance
• README with quick start and troubleshooting tips
• Optional Docker instructions for local development

Who is this for?

• Backend developers who want a secure, time-saving auth foundation
• Teams prototyping SaaS products that need role-based access quickly
• Developers learning best practices for JWT, token rotation, and clean error handling
• Anyone who wants a tested auth flow to adapt into an existing Spring Boot app

Quick start (what you’ll do after download)

1. Extract the zip file and edit application.properties (DB + JWT secret).
2. mvn clean install → mvn spring-boot:run (or use Docker).
3. Import the included Postman collection, run Register → Login → Profile to see everything working.

Technical notes

• Java 21+, Spring Boot 3.x, Maven. (MySQL / H2 supported)
• The project is opinionated — easy to extend. Role names and token TTLs are configurable.
• Postman scripts automatically manage access_token/refresh_token for testing.

Support & license

• This product is sold under the MIT license. You can use it in personal or commercial projects.
• I’ll provide basic installation help if you hit issues (email: boileragents@gmail.com).
• No refunds for changed minds — but if the project is broken on delivery I’ll help fix it.

Why buy this, not just copy from tutorials?

Because this is a concise, practical, and complete implementation you can run, test, and build on immediately. No patching together half-baked snippets, no missing edge cases — just a clean auth foundation that works.