Supabase Tutorial: Build a Full-Stack App in 2026

Use UUID Primary Keys

Always use uuid_generate_v4() for primary keys instead of auto-incrementing integers. UUIDs are globally unique, prevent enumeration attacks (users cannot guess other record IDs), and work seamlessly with Supabase Auth (which uses UUIDs for user IDs).

Link Tables to auth.users

Create a foreign key from your table's user_id column to auth.users(id). This ensures data integrity and makes Row Level Security policies simple to write. Every user-owned table should have a user_id column that references the authenticated user.

Add Timestamps

Include created_at (default now()) and updated_at columns on every table. Create a trigger that automatically updates updated_at on row changes. These columns are invaluable for debugging, sorting, and building features like "recently modified."

Users Can Only Read Their Own Data

The most common pattern. The policy checks that the row's user_id matches the authenticated user's ID.

Public Read, Authenticated Write

For content like blog posts or product listings where anyone can read but only logged-in users can create.

Team-Based Access

For multi-tenant apps where users belong to teams/organizations and can access team data.

Third-party API calls

Call OpenAI, Stripe, Resend, or any API that requires a secret key. Edge functions keep secrets server-side.

Webhook handlers

Process Stripe webhooks, GitHub webhooks, or any incoming event from external services.

Scheduled tasks (Cron)

Run functions on a schedule using pg_cron. Send daily email digests, clean up old data, or sync with external systems.

Complex data processing

Transform data, generate PDFs, resize images, or run any compute-intensive logic that should not block the frontend.

Server Components

Fetch data directly in React Server Components using the server-side Supabase client. Data loads on the server, so the page arrives fully rendered with zero client-side loading states. Use this for page content, metadata, and SEO-critical data.

Client Components

Use the browser Supabase client for interactive features: real-time subscriptions, form submissions, file uploads, and auth state changes. Wrap these in "use client" components and use React hooks for state management.

Route Handlers (API Routes)

For server-side logic that needs the service_role key (admin operations, webhooks), use Next.js Route Handlers in the app/api directory. These run on the server and can perform privileged database operations.

Middleware

Use Next.js middleware to refresh auth sessions on every request. This ensures the session cookie stays fresh and prevents users from being unexpectedly logged out. Supabase provides a helper function for this.