JWT vs Session Cookies: Which Should You Use?
JWTs and session cookies solve the same job, user authentication, in opposite ways. Sessions keep state on the server; JWTs carry it inside a signed token. This guide compares them so you can choose for scale, revocation, and security.
What Is the Core Difference Between a JWT and a Session?
A session stores a record on the server next to a small opaque cookie id. A JWT encodes the identity claims directly in a signed, self-contained token the client sends back on each request.
Which One Scales Better Across Many Services?
JWTs scale cleanly because any service can verify the signature without shared session storage. Sessions scale too but need a central store or sticky routing once you run multiple servers.
How Do They Compare on Revocation and Security?
Sessions revoke instantly by deleting the server record. JWTs only revoke after expiry or a blacklist, because they are valid until the signature expires. JWTs also need care so the readable payload never holds secrets.
How Do You Inspect a JWT for Auditing?
In both approaches you may need to read token claims for debugging. Decode a JWT's header, payload and signature locally with the JWT decoder to audit expiration and claims without exposing secrets.