intermediate~2h
Authentication with JWT
The single most requested Spring Boot topic, and the one most often implemented with a vague understanding of what's actually inside the token. This module fixes that.
Learning objectives
- Beginner: A single service issuing and validating its own HS256 tokens, with a hardcoded (but externalized, per Module 05) secret.
- Intermediate: Proper claim design (subject, role, expiry) with a short token lifetime, paired with centralized exception handling (Module 16) for expired/invalid tokens.
- Advanced: RS256 with a dedicated auth service holding the private key, and every other microservice (Module 18) verifying independently with only the public key — no shared secret to rotate across services.
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Authentication with JWT