💰 Monthly Expenses Tracker (Flask Web App)

A clean, modern web dashboard to track monthly income and expenses — built with Flask and local JSON storage.

📌 Overview

Monthly Expenses Tracker (Web) is a Flask-based web application that provides a modern admin dashboard for managing monthly budgets. It is a full migration of the original Python CLI tool into a browser-based interface — no databases or external services required.

This project demonstrates:

• Flask web application structure (Blueprint, app factory pattern)
• Jinja2 templating with a shared base layout
• File-based data persistence (JSON)
• Separation of concerns: routes, data logic, templates, and static assets

✨ Features

• 📊 Live dashboard with stat cards and a spending doughnut chart
• ➕ Add, edit, and delete expenses via modal forms
• 🗂️ Category-based spending breakdown with progress bars
• 💰 Savings rate calculation
• 📥 Export full summary to CSV
• ⚙️ Settings page to update salary and reset all data
• 🎨 Dark theme UI with no external CSS framework dependencies

🧰 Tech Stack Used

• Backend: Python, Flask 3.0+
• Templating: Jinja2
• Frontend: HTML5, CSS3, Vanilla JavaScript
• Charts: Chart.js (CDN)
• Data Storage: JSON (local filesystem)

🚀 Getting Started (Local Setup)

🛠️ Prerequisites

• Python 3.8+ installed

📦 Installation

git clone https://github.com/NHasan143/monthly-expenses-tracker.git
cd monthly-expenses-tracker
python -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

▶️ Usage

Run the development server:

python run.py

Then open your browser and go to:

http://localhost:5000

⚠️ If port 5000 is in use change the port in run.py:

app.run(debug=True, port=5001)

🗂️ Project Structure

monthly-expenses-tracker/
├── run.py                        # App entry point
├── requirements.txt              # Python dependencies
├── budget_data.json              # Local data storage (auto-created)
└── app/
    ├── __init__.py               # Flask app factory
    ├── routes.py                 # All URL routes (Blueprint)
    ├── data.py                   # Data logic: load, save, calculate
    ├── templates/
    │   ├── base.html             # Shared layout (sidebar, topbar, flash messages)
    │   ├── dashboard.html        # Stat cards, chart, recent expenses
    │   ├── expenses.html         # Full expense table with edit/delete
    │   └── settings.html        # Salary update, CSV export, data reset
    └── static/
        ├── css/
        │   └── main.css          # All styles (variables, layout, components)
        └── js/
            ├── modals.js         # Shared modal open/close logic
            ├── dashboard.js      # Chart.js doughnut chart
            └── expenses.js       # Edit modal population

💾 Data Storage

This project uses a local JSON file (budget_data.json) to store income and expenses. All financial data is kept on your machine, making the application:

• Easy to reset (delete the JSON file and restart)
• Transparent and portable
• Suitable for fully offline use

📄 Pages

🔮 Roadmap & Future Enhancements

• [Added] Flask web interface dashboard
• [Added] Spending breakdown by category with chart
• [Added] Edit existing expenses
• [Added] Export summary to CSV
• [Added] Savings rate calculation
• User authentication (login/logout)
• Monthly history (track across multiple months)
• Mobile responsive layout
• Dark/light theme toggle

🤝 Contributing

Contributions are welcome.

1. Fork the repo
2. Create a branch: git checkout -b feature/my-change
3. Commit changes: git commit -m "Add my change"
4. Push: git push origin feature/my-change
5. Open a Pull Request

📄 License

Licensed under the MIT License. See LICENSE.

👤 Author

Naymul Hasan GitHub: https://github.com/NHasan143