A lightweight, fully offline Billing and Invoice Management system built with HTML, CSS, and Vanilla JavaScript. Features local data persistence, revenue analytics, and printable invoices.
A feature-rich, Single Page Application (SPA) designed to handle billing and invoicing tasks efficiently. This project is built entirely with frontend technologies and operates 100% offline using the browser's LocalStorage for data persistence.
- 📝 Invoice Generation: Create detailed invoices with client information, itemized lists, and custom tax rates.
- 💾 Local Data Persistence: Uses the Web Storage API (LocalStorage) to save all invoices directly in the browser. No database connection required.
- 📊 Analytics Dashboard: Visualizes revenue trends, tracks paid vs. pending invoices, and identifies top clients.
- 🖨️ Print-Ready: Custom CSS (
@media print) ensures invoices look professional when printed or saved as PDF. - ⚡ Instant Calculations: Real-time calculation of subtotals, taxes, and grand totals using JavaScript.
- 🌗 Modern UI: A dark-themed, responsive interface designed with CSS Grid and Flexbox.
- HTML5: Semantic structure.
- CSS3: Custom styling + Tailwind CSS (via CDN) for responsive design.
- JavaScript (ES6+): Core logic, DOM manipulation, and data handling.
- LocalStorage: Client-side "database" for storing invoice history.
BillingProject/
├── index.html # The main structure of the application
├── style.css # Custom styling and print layouts
└── script.js # Logic for calculations, storage, and UI updates