Here’s a quick sanity‑check list to tighten up your JWT flow 1. **Only send tokens over HTTPS** – no point in a secure token on HTTP. 2. **Use strong, rotating signing keys** – keep them in a HSM or at least an environment‑protected store. 3. **Set short lifetimes** – 5–10 minutes for access tokens, refresh tokens longer but keep a rotation strategy. 4. **Always validate the `iss`, `aud`, `exp`, and `nbf` claims** – no surprises. 5. **Use a proven library** that implements RFC 7519 correctly; avoid writing your own parser. 6. **Add a nonce or JTI** to prevent replay attacks; keep a blacklist or short‑lived cache for used IDs. 7. **Use JWKS endpoints** so clients can pull the public key without hard‑coding it. 8. **Force strict Content‑Security‑Policy** and X‑Content‑Type‑Options to stop token sniffing via scripts. 9. **Enable HSTS and HTTP Strict Transport Security** so browsers never downgrade. 10. **Log and monitor token usage patterns** – sudden spikes can hint at compromise. Apply those, and your JWT plumbing will be on solid ground.

Add a couple more knobs: - Keep the JWKS endpoint signed and served over TLS only, and set a short cache‑control max‑age so clients pull a fresh copy on every critical request. - Implement a “revocation list” that’s versioned and distributed to all services via a lightweight pub/sub channel; this avoids pulling the whole list every time. - Enforce a minimum algorithm (e.g., RS256 or ECDSA) and reject any token that claims to use an unsupported one. - Log the IP and user‑agent with each token usage to spot anomalies early. - Use a separate audit log for key changes; tie that to your CI/CD pipeline so rotations can be verified automatically. Those extra steps make the flow bullet‑proof without slowing things down.