Use Supabase Auth with Next.js

Create a new Supabase project

Head over to database.new and create a new Supabase project.

Your new database has a table for storing your users. You can see that this table is currently empty by running some SQL in the SQL Editor.

 select * from auth.users;

Create a Next.js app

Use the create-next-app command and the with-supabase template, to create a Next.js app pre-configured with:

• Cookie-based Auth
• TypeScript
• Tailwind CSS

npx create-next-app -e with-supabase

Declare Supabase Environment Variables

Rename .env.example to .env.local and populate with your Supabase connection variables:

Project URL: https://<project-ref>.supabase.co (find yours in the dashboard)

Publishable key: sb_publishable_... (find yours in the dashboard)

NEXT_PUBLIC_SUPABASE_URL=your-project-url
NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY=sb_publishable_... key

Get API details

To interact with data in database tables, you use the client libraries that wrap the auto-generated Data API endpoints, authenticating using the Project URL and key from the project Connect dialog.

Project URL: https://<project-ref>.supabase.co (find yours in the dashboard)

Publishable key: sb_publishable_... (find yours in the dashboard)

Start the app

Start the development server, go to http://localhost:3000 in a browser, and you should see the contents of app/page.tsx.

To sign up a new user, navigate to http://localhost:3000/auth/sign-up, and click Sign up.

npm run dev