TypeScript and Authentication
Harry
· 22 Sep 2026
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TypeScript with React
Type props with interfaces, state with generics, events with React types, and API responses with Promise types.
JWT Flow
Login returns access plus refresh tokens; attach Bearer headers; on 401 refresh and retry, else log out.
RBAC and Security
Guard routes by role; enforce on the server; use httpOnly cookies, CORS allowlists, HTTPS and sanitized rendering.
Key Points
- Types catch contract bugs early.
- Frontend guards are UX; backend enforces.
- Never store high-risk tokens in localStorage.