This is a Next.js project bootstrapped with create-next-app.

First, run the development server:

npm run dev
# or
yarn dev
# or
pnpm dev
# or
bun dev

Open http://localhost:3000 with your browser to see the result.

Create .env.local in the project root and add the web app configuration from Firebase Console > Project settings > Your apps:

NEXT_PUBLIC_FIREBASE_API_KEY=
NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN=
NEXT_PUBLIC_FIREBASE_PROJECT_ID=
NEXT_PUBLIC_FIREBASE_APP_ID=

These NEXT_PUBLIC_ values are Firebase web client configuration, not service-account credentials.

In Firebase Console, enable Email/Password and Google under Authentication > Sign-in method. Add localhost and your deployed hostname to Authentication > Settings > Authorized domains. Restart the development server after changing .env.local.

Create a Cloud Firestore database in Firebase Console. Publish the rules in firestore.rules from Firestore Database > Rules. Invoices are saved under users/{userId}/invoices, so each user can access only their own records. Copying an invoice link creates a public, read-only snapshot under publicInvoices; anyone with that link can view the invoice, excluding the recipient email. Account deletion is a soft delete: the profile and invoices remain stored, access is blocked while deleted, and signing up again with the same verified credentials restores the same account and invoices. Republish the rules after changing them for these access checks to take effect.

You can start editing the page by modifying app/page.tsx. The page auto-updates as you edit the file.

This project uses next/font to automatically optimize and load Geist, a new font family for Vercel.

To learn more about Next.js, take a look at the following resources:

• Next.js Documentation - learn about Next.js features and API.
• Learn Next.js - an interactive Next.js tutorial.

You can check out the Next.js GitHub repository - your feedback and contributions are welcome!

The easiest way to deploy your Next.js app is to use the Vercel Platform from the creators of Next.js.

Check out our Next.js deployment documentation for more details.