How to add multi-tenant authentication to your Next.js SaaS

Building a SaaS application that caters to multiple organizations involves addressing both data and authentication architecture challenges, with a focus on ensuring that the organization context is correctly managed within the session. The text outlines how to implement organization-scoped sessions in a multi-tenant environment using Next.js App Router, emphasizing the importance of carrying both user identity and active organization ID within the session to enforce correct data access and permissions. It details the use of WorkOS AuthKit for handling multi-tenant authentication layers, including configuring SSO per tenant, managing invitations, and ensuring secure session management. The guide stresses that all server actions should validate resource ownership based on the authenticated session rather than URL parameters, thus ensuring tenant isolation and correct data access. WorkOS provides tools for managing organizational contexts, such as directory sync for enterprise customers and role-based access control (RBAC), ensuring that each authenticated request is scoped to the correct organization. This setup is crucial for maintaining security and functionality in multi-tenant applications.

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