A long-titled repository showing how you could potentially use SvelteKit deployed to Netlify with Google OAuth for authentication. Not the only way or perhaps even the best way, but a way.

Demo

• Create OAuth 2.0 credentials for your application.
  • Add an authorized redirect URI entry for http://localhost:3000/auth/callback.
• Copy .env.sample to .env
• Generate secrets for JWT and cookie signing.

node -p "require('crypto').randomBytes(64).toString('hex');"

• Optionally set AUTHORIZED_DOMAIN to restrict authentication to only this domain.
• The other values can remain the same for local development.
• Install dependencies and run.

npm install
npm run dev

• Generate new OAuth 2.0 credentials and secrets for Netlify.
  • Add a new authorized redirect URI entry for https://my-netlify-app-name.netlify.app/auth/callback.
• Add them to your site's build deployment environment variables.
  • Also set NODE_ENV=production and AUTH_REDIRECT=https://my-netlify-app-name.netlify.app/auth/callback.
• Deploy to Netlify.

Thanks to a few different articles and authors for inspiration and help.

• Sveltekit Authentication
• Serverless OAuth with Multiple Providers
• Creative Tim Tailwind Starter

MIT