Multi-Tenant Next.js App with Prisma and PropelAuth

Multi-tenant applications allow multiple organizations to share application infrastructure while requiring strong controls to prevent users from accessing another tenant’s data. The walkthrough builds a B2B posting application with Next.js, Prisma, and PropelAuth, where users can create and view posts only within organizations they belong to, including support for users who participate in multiple organizations through organization-specific URL paths. Next.js dynamic routes identify the requested organization, while PropelAuth supplies hosted signup, organization management, membership checks, and access tokens for authenticated requests. Although frontend membership checks improve usability by displaying “Not found” for unauthorized organization pages, backend enforcement is essential because client-side restrictions alone do not secure data. Next.js API routes verify access tokens and organization membership before querying or creating Prisma-managed database records, assigning both organization and user IDs to each post. Testing confirms that unauthenticated requests receive 401 errors and authenticated users attempting to access organizations they do not belong to receive 403 errors, illustrating a layered approach to tenant isolation.

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