JWT vs OAuth2 vs Session Auth: Securing Modern Web Applications

Application security begins with robust authentication. Choosing between JWTs, Sessions, and OAuth2 depends on your system architecture and compliance needs.

1. Stateless JWTs vs Stateful Sessions

JSON Web Tokens (JWT) allow stateless authorization across microservices, but immediate revocation requires token blacklists. Stateful HTTP sessions offer instant invalidation at the cost of centralized Redis session stores.

2. OAuth2 & OIDC Flows

OAuth2 handles delegated access for third-party integrations, while OpenID Connect (OIDC) adds user identity verification on top of OAuth2.

Security Best Practices

Always store refresh tokens in HttpOnly, SameSite=Strict cookies to mitigate XSS and CSRF attacks. Rotate refresh tokens on every renewal.

Enforce strict Rate Limiting on authentication endpoints to defeat credential stuffing attacks.