소개
This skill provides specialized guidance for building secure access control systems, covering both authentication (identifying users) and authorization (managing permissions). It offers implementation patterns for stateless JWT workflows with refresh tokens, stateful session management via Redis, and third-party social login integration using Passport.js. Whether you are building a new API or securing an existing application, this skill helps you implement scalable security architectures including Role-Based Access Control (RBAC) and fine-grained permission systems while avoiding common security vulnerabilities.