SmartInvoice - Professional Invoice Management System

A comprehensive, production-ready invoice management system built with Next.js, featuring AI-powered suggestions, automated reminders, and professional PDF generation.

🚀 Features

Core Functionality

• Professional Invoice Creation - Beautiful, branded PDF invoices
• Client Management - Comprehensive client database with history
• Payment Tracking - Multiple payment methods and status tracking
• Analytics Dashboard - Revenue insights and business metrics
• Export Capabilities - CSV exports and bulk PDF downloads

Smart Features

• AI Auto-Suggestions - Smart line item and client suggestions
• Automated Reminders - Intelligent overdue invoice management
• Multi-Currency Support - Global business ready
• GST/VAT Handling - Tax compliance built-in
• Email Integration - Automated invoice delivery

Technical Excellence

• Responsive Design - Mobile-first, professional UI
• SQLite Database - Reliable local data storage
• JWT Authentication - Secure user management
• PDF Generation - Professional branded invoices
• Email Service - SMTP integration for notifications

🛠 Technology Stack

• Frontend: Next.js 13, React, TypeScript
• Styling: Tailwind CSS, Custom Green Theme
• Database: SQLite with migration support
• Authentication: JWT with bcrypt
• PDF Generation: jsPDF with custom templates
• Email: Nodemailer with SMTP
• Icons: Lucide React
• UI Components: Custom component library

📦 Installation & Setup

Prerequisites

• Node.js 18+
• npm or yarn

Quick Start

1. Clone and Install

   git clone <repository-url>
   cd smartinvoice
   npm install

2. Environment Configuration
   Create .env.local file:

   JWT_SECRET=your-super-secure-jwt-secret
   EMAIL_HOST=smtp.gmail.com
   EMAIL_PORT=587
   EMAIL_USER=your-email@gmail.com
   EMAIL_PASS=your-app-password
   EMAIL_FROM=your-email@gmail.com
   NEXT_PUBLIC_APP_URL=http://localhost:3000

3. Start Development Server

   npm run dev

4. Access Application

   • Open http://localhost:3000
   • Demo login: demo@smartinvoice.com / demo123

Email Configuration (Gmail)

1. Enable 2-Factor Authentication on your Gmail account
2. Generate an App Password:
   • Go to Google Account Settings
   • Security → 2-Step Verification → App passwords
   • Generate password for "Mail"
3. Use the generated password in EMAIL_PASS

Test Email Configuration

Visit /api/test-email to verify email setup.

🚀 Deployment

Production Environment Variables

JWT_SECRET=your-production-jwt-secret
DATABASE_URL=your-production-database-url
EMAIL_HOST=your-smtp-host
EMAIL_USER=your-email
EMAIL_PASS=your-email-password
EMAIL_FROM=your-from-email
NEXT_PUBLIC_APP_URL=https://your-domain.com
NODE_ENV=production

Deployment Platforms

Vercel (Recommended)

npm run build
vercel --prod

Railway

railway login
railway init
railway up

Docker

FROM node:18-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
RUN npm run build
EXPOSE 3000
CMD ["npm", "start"]

📊 Business Features

Invoice Management

• Professional PDF generation with branding
• Multiple templates and customization
• Automatic numbering and tracking
• Status management (Draft, Sent, Paid, Overdue)

Client Relationship Management

• Complete client profiles
• Invoice history and analytics
• Payment behavior tracking
• Communication logs

Financial Analytics

• Revenue tracking and forecasting
• Payment analytics
• Client performance metrics
• Export capabilities for accounting

Automation

• Smart reminder system
• Overdue invoice management
• Email automation
• Payment notifications

🎨 Customization

Branding

• Update company information in invoice templates
• Customize colors in globals.css
• Replace logo in PDF generator
• Modify email templates

Features

• Add payment gateway integration
• Implement recurring invoices
• Add time tracking
• Extend reporting capabilities

🔧 API Endpoints

Authentication

• POST /api/auth/login - User login
• POST /api/auth/signup - User registration
• GET /api/auth/me - Get current user

Invoices

• GET /api/invoices - List invoices
• POST /api/invoices - Create invoice
• GET /api/invoices/[id] - Get invoice
• PUT /api/invoices/[id] - Update invoice
• DELETE /api/invoices/[id] - Delete invoice
• GET /api/invoices/[id]/pdf - Download PDF

Clients

• GET /api/clients - List clients
• POST /api/clients - Create client
• GET /api/clients/[id] - Get client
• PUT /api/clients/[id] - Update client
• DELETE /api/clients/[id] - Delete client

Analytics & Export

• GET /api/analytics - Business analytics
• GET /api/export/invoices - Export invoices CSV
• GET /api/export/clients - Export clients CSV

🛡 Security Features

• JWT-based authentication
• Password hashing with bcrypt
• Input validation and sanitization
• SQL injection prevention
• XSS protection
• CORS configuration

📱 Mobile Support

• Fully responsive design
• Touch-friendly interface
• Mobile-optimized forms
• Progressive Web App ready

🤝 Contributing

1. Fork the repository
2. Create feature branch (git checkout -b feature/amazing-feature)
3. Commit changes (git commit -m 'Add amazing feature')
4. Push to branch (git push origin feature/amazing-feature)
5. Open Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🆘 Support

For support and questions:

• Create an issue on GitHub
• Email: support@smartinvoice.com
• Documentation: [docs.smartinvoice.com]

🎯 Roadmap

• Payment gateway integration (Stripe, Razorpay)
• Recurring invoice automation
• Time tracking integration
• Multi-language support
• Advanced reporting
• Mobile app development
• API for third-party integrations

SmartInvoice - Professional invoice management for modern businesses.