JWT vs Session Authentication: Which Should You Use?
JWTs are stateless tokens carried by the client; sessions are stateful records kept on the server. The choice affects scalability, storage and revocation.
| Aspect | JWT (token) | Session (server) |
|---|---|---|
| State | Stateless (self-contained) | Stateful (stored server-side) |
| Stored where | Client (cookie/localStorage) | Server (memory/DB), ID in cookie |
| Scalability | Easy across services | Needs shared session store |
| Revocation | Harder (until expiry) | Easy (delete the session) |
| Payload | Carries claims/data | Just an opaque ID |
| Best for | APIs, microservices, SPAs | Traditional server-rendered apps |
The key difference
A JWT is a signed, self-contained token: the server can verify it without storing anything, which makes it stateless and easy to scale across services. A session stores the user's state on the server and gives the client only an opaque ID; the server looks the state up on each request. Sessions are easy to revoke (just delete them); JWTs remain valid until they expire unless you build extra revocation infrastructure.
Which should you use?
Use JWTs for stateless APIs, microservices and single-page apps where scaling and cross-service auth matter — but keep expiries short and plan for revocation. Use server sessions for traditional, server-rendered apps where easy revocation and simplicity are more valuable than statelessness.