How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-based access control (RBAC). It never directly decides access; instead, it relies on the backend's authorization response.

Frontend Integration: Authorization in Next.js

The frontend's responsibilities include:

• Retrieving user permissions from the backend.
• Ensuring API calls respect RBAC.
• Hiding UI elements inaccessible to the current user (e.g., "Create Assignment" for students).

Implementation Steps:

1. Setup: The guide assumes Node.js is installed. A Next.js app is created using:

   npx create-next-app@latest frontend
   cd frontend

   

2. Shadcn UI Integration: Tailwind CSS is pre-installed. Shadcn UI is added for consistent styling:

   npx shadcn@latest init
   npx shadcn@latest add button card dialog input label table select tabs

3. Package Installation: Essential packages are installed:

   npm i lucide-react zustand
   npm i --save-dev axios

   Global CSS is added for UI consistency (see original article for the CSS code).

4. Component Creation: Several components are created (AddAssignmentDialog, AddStudentDialog, AssignmentsTable, AuthLayout, Features, Footer, Hero, MobileMenu, Navbar, NotAuthorizedDialog, StudentsTable – see original article for details). These components handle user interactions, data display, and form submissions.

5. State Management and Types: Zustand is used for state management. Stores are created for authentication (useAuthStore) and user profiles (useProfileStore). TypeScript interfaces (Assignment, AssignmentsTable, Student, StudentsTable) define data structures. (See original article for code).

6. Routing: The app/page.tsx file sets up the main layout. Additional pages are created for signup (app/signup/page.tsx), role selection (app/role-selection/page.tsx), login (app/login/page.tsx), and the dashboard (app/dashboard/page.tsx). Each page uses the appropriate components and interacts with the backend APIs and Zustand stores. (See original article for code).

7. Testing: After running npm run dev, the application is accessible at http://localhost:3000/. Testing involves creating a school, signing up/logging in as different roles, and verifying access control.

   

Key Takeaways:

• Permit simplifies RBAC implementation, dynamically managing permissions.
• Tenant-aware policies maintain data isolation between schools.
• Centralized access control reduces complexity.
• Frontend only displays authorized UI elements.
• Appwrite and Permit accelerate development by handling authentication and authorization.

Conclusion:

This integration demonstrates how Permit streamlines authorization in a multi-tenant EdTech SaaS application built with Next.js and Appwrite. The separation of concerns between frontend and backend, with Permit managing the authorization logic, results in a more maintainable and secure application. (Backend and frontend GitHub repositories are linked in the original article).

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