Run a whole supermarket from one screen. Supermarket Management System is a complete, self-hosted point of sale, inventory and staff attendance application with full source code, built with Next.js, Node.js, TypeScript and PostgreSQL. Cashiers ring up sales with a barcode scanner and print or download receipts. Stock updates with every sale, and managers are emailed before products run out. Each branch has its own staff and stock, and the dashboard shows revenue, sales trends and top categories by branch and period. Staff attendance uses face recognition: a manager registers a staff member's face once, and from then on they check in and out with a face scan on their own screen. Managers approve the hours and export them to CSV or PDF. Requirements: a server, VPS or computer that can run Node.js 18 or newer (not PHP-only shared hosting), PostgreSQL 12 or newer, a free Cloudinary account for image uploads, a Gmail account with an App Password for emails, and a webcam on devices used for face check-in. Setup: unzip, run npm install, create an empty PostgreSQL database, fill in the example environment files, then run npm run setup. It creates the tables and asks for your business details, currency, first branch and administrator account. Full step-by-step documentation is included in the documentation folder. Good to know: payroll is not included; the Payroll menu item is a placeholder. Changing the currency changes how prices are displayed and does not convert prices already entered.