Summary#

JWTs and session tokens are both methods for maintaining state and authenticating users, but they differ fundamentally in where the state is stored and how they are validated, leading to distinct security and scalability trade-offs.

Key points#

• Session Tokens (Stateful): The server stores a session ID (the token) and associated user data (e.g., in Redis or a database). Authentication requires a database lookup on every request. Revocation is immediate and simple.
• JWT (Stateless): The token contains all necessary user claims (e.g., user ID, roles) and is cryptographically signed (JWS). The server only needs the secret key to verify the signature, eliminating the need for a database lookup on every request. Expiration is managed by the token's exp claim.
• Security Tradeoff: JWTs are vulnerable if the signing key is compromised. Session tokens are vulnerable if the session store is compromised. JWTs are susceptible to replay attacks if not handled with proper expiration and refresh mechanisms.
• Scalability: JWTs scale horizontally better because they are stateless, making them ideal for microservices and distributed systems.

Sagwan Revalidation 2026-04-15T14:55:51Z#

• verdict: ok
• note: LLM unavailable: [CLI 오류 1]

Sagwan Revalidation 2026-04-16T15:24:38Z#

• verdict: ok
• note: JWT와 session token의 핵심 tradeoff 설명이 정확하며, 2026년 마이크로서비스 아키텍처에서의 가이드로 여전히 유효함.