Registration

Goal

This snapshot advances Wavelength Daily by teaching you to validate and register users with Supabase Auth.

Each numbered folder is a complete app. Run it independently and compare adjacent snapshots to isolate the new responsibility.

Prerequisites

Use Node.js 20 or newer, npm, and a terminal. Basic TypeScript, HTML, and CSS familiarity will help.

The development server uses port 5173. Database snapshots also need Docker and the Supabase CLI.

• Node.js and npm
• A code editor
• Docker from part 4 onward

Concepts

A server action validates credentials before sign-up and the database trigger creates a matching profile.

SvelteKit keeps route UI, server loading, and form actions close together while preserving a clear browser/server boundary.

Walkthrough

Parse form data with Zod, call signUp, configure the callback URL, and return useful field errors.

Trace the example from request to rendered page, then inspect the complete matching snapshot for types, validation, and failure handling.

await supabase.auth.signUp({ email, password });

Run and verify

Enter 06-Registration, install dependencies, and start the app. Supabase stages must start the local stack and copy the printed anon key into .env.

Open http://localhost:5173 and keep the terminal visible so browser actions can be matched to server errors.

git clone https://github.com/michaeldunga1/fcc-sveltekit-blog.git
cd fcc-sveltekit-blog/06-Registration
npm install
npx supabase start
cp .env.example .env
npm run dev

Troubleshooting

Check Supabase Auth confirmation settings if a new account cannot sign in locally.

A missing package usually means npm install ran in another snapshot. After changing environment variables, restart the SvelteKit process.

• Read the first error first
• Check the current snapshot path
• Never commit .env or node_modules

Try this

Reject a short password and an invalid email before registering a valid account.

Test one happy path and one invalid or unauthorized path before moving on.

• Make one focused change
• Verify it in the browser
• Compare with the next snapshot after it works