How to Implement RBAC in an Express.js Application

Implementing Role-Based Access Control (RBAC) in an Express.js application enhances security and maintainability by organizing access control through defined roles such as admin, editor, and viewer, each with specific permissions. This approach is particularly useful in multi-tenant systems where tenant isolation is crucial to prevent data breaches between organizations. The guide demonstrates how developers can use Permit.io to separate authorization logic from application code, thus keeping the business logic clean and focused. It highlights the limitations of custom-built authorization methods, which often lead to scattered and hard-to-maintain permission logic, and suggests a more structured RBAC model to ensure secure and scalable access control. By setting up roles and permissions through Permit.io's dashboard, and integrating it with Express.js, developers can achieve efficient authorization management while enabling comprehensive auditing and logging capabilities to track document access and modifications across different tenants, ensuring both security and compliance.