How to Build Email OTP Based Authentication with Spring Boot and JWT in Action
In this quick demo, I walk through a fully working OTP-based
authentication system built with Spring Boot.
No passwords. Just email OTP → verify → JWT. Clean and production-ready.
🔐 What's covered:
→ User registration with auto OTP dispatch
→ 6-digit OTP via Gmail SMTP (HTML email)
→ OTP validation (expiry, max attempts, one-time use)
→ JWT issued on successful verification
→ Spring Security stateless config
🛠 Tech Stack:
→ Spring Boot 3.2
→ Spring Mail (Gmail SMTP)
→ Spring Security + JWT (JJWT)
→ Spring Data JPA + H2
→ Lombok
📌 Key classes:
→ OtpService – generate, validate, expire
→ EmailService – HTML OTP email via JavaMailSender
→ JwtUtil – sign & verify tokens
→ AuthService – orchestrates the full flow
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