Full-Featured Offline POS System Built with JavaScript PWAFull-Featured Offline POS System Built with JavaScript PWA
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Michael Tallo
• Jul 10
POS System — A full-featured, offline-first Point-of-Sale application built as a vanilla JavaScript Progressive Web App (PWA) with IndexedDB for local data storage. Deployed and actively used for real daily business operations.
Key features:
Multi-user authentication with role-based access control (Admin / Cashier)
Per-cashier drawer session tracking and shift management
Real-time inventory management
Sales reporting and analytics
Offline-capable via service worker caching, syncing when back online
Tech stack: Vanilla JavaScript, IndexedDB, Service Workers (PWA architecture)
Web DesignWeb DevelopmentWebsite CSSCSSHTML5JavaScript
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