principletypescriptTip
JWT vs Session-Based Auth: Choosing the Right Strategy
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jwtsessionstatelessstatefulrevocationcookie sizetoken payload
Problem
Teams default to JWTs without understanding the trade-offs, leading to inability to revoke tokens, oversized cookies, or unnecessary infrastructure complexity.
Solution
Use database sessions (stateful) when you need instant revocation, server-side rendering, or tight security. Use JWTs (stateless) when you need horizontal scaling without a shared session store or when issuing tokens for third-party API clients.
Why
JWTs are self-contained and verifiable without a database lookup, making them fast and scalable but impossible to revoke before expiry. Database sessions require a lookup on every request but can be invalidated at any time.
Gotchas
- A short-lived JWT (15 min) with refresh token rotation gives most revocation benefits while staying stateless
- Storing large JWTs in cookies can exceed the 4096-byte limit — keep payloads minimal
- Never store sensitive data in a JWT payload — it is base64-encoded, not encrypted, and readable by anyone with the token
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