IBAN Checker 🏦

A modern, real-time Italian IBAN validation tool with instant feedback. Built with ES6 modules and a glassmorphism UI.

✨ Features

Real-time Validation

• Instant feedback as you type (no button click needed)
• 6 validation indicators: Format, Mod.97, CIN, ABI, CAB, CC
• 3-state indicators: ✅ Valid, ⚠️ Warning, ❌ Invalid

Comprehensive Checks

• Format Validation: 27 characters, starts with IT
• Modulo 97: ISO 13616 international standard
• CIN Algorithm: Italian Control Internal Number verification
• ABI Lookup: Bank identification with 1800+ banks database
• CAB Validation: Branch code format check
• CC Validation: Account number pattern (hybrid strict + permissive)

Smart Features

• Bank & Branch Info: Displays bank name and branch location
• Typo Correction: Suggests fixes for invalid IBANs (single char substitution, swaps)
• Clipboard Support: Paste from clipboard, copy results
• Responsive Design: Works on desktop and mobile

🚀 Usage

Quick Start

1. Clone the repository
2. Open index.html via a local server (e.g., VS Code Live Server)
3. Start typing an IBAN - results appear instantly!

Note: A local server is required due to ES6 module imports and JSON fetch requests.

Development

# Install dependencies
npm install

# Watch for CSS changes
npm run watch

# Build for production
npm run build

📁 Project Structure

├── index.html              # Main HTML file
├── style.css               # Compiled Tailwind CSS
├── js/
│   ├── main.js             # App initialization
│   ├── validators.js       # Validation functions (CIN, Mod97, etc.)
│   ├── corrections.js      # Typo correction logic
│   ├── ui.js               # UI updates and indicators
│   ├── data.js             # Bank data loading
│   └── utils.js            # Utilities (debounce, clipboard)
├── ABI-List.json           # 1800+ Italian bank codes
└── CAB-List.json           # Branch codes database

🔧 Technologies

• HTML5 - Semantic markup
• JavaScript ES6+ - Modular architecture
• Tailwind CSS - Utility-first styling
• Font Awesome - Icons

📋 Validation Logic

Check	Green ✅	Yellow ⚠️	Red ❌
ABI	Known bank	Valid format, unknown bank	Invalid format
CC	Matches strict pattern	Matches permissive only	Invalid

The CC strict pattern is based on empirical analysis of 300+ real Italian IBANs from various banks.

📄 License

ISC