Short answer
Decode JWTs to inspect claims, but verify signatures, expiration, issuer, audience, and authorization rules before trusting anything.
JWT Security Debugging Without Fooling Yourself
Decode JWTs to inspect claims, but verify signatures, expiration, issuer, audience, and authorization rules before trusting anything.
Why it matters
- Never put secrets in JWT payloads
- Check expiration and audience
- Treat decode as inspection only
What to know
JWT payloads are often readable by design, which makes them useful for debugging and dangerous for secrets.
A decoded token can look valid while being expired, issued for another app, or signed with the wrong key.
Security debugging should separate inspection from trust decisions so teams do not ship false assumptions.