📝 Flask Guestbook App

A beginner-friendly Flask project that demonstrates:

• Multi-page routing
• Template inheritance with Jinja2
• Form handling (GET & POST)
• Basic CSS styling
• In-memory data storage

This is Part 3 of a tutorial series on building web apps with Flask.

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🚀 Demo

• 🏠 Home Page – A welcome message
• 📖 Guestbook Page – Users can leave their name and a message
• 🎨 Styled UI – Uses static/style.css for basic formatting
• 🔄 Reset Route – Clears all guestbook entries for testing

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📁 Project Structure

flask-guestbook/
├── app.py # Main Flask application
├── static/ # Static files (CSS, JS, images)
│     └── style.css # Styling for form and layout
└── templates/ # Jinja2 HTML templates
│     └──  base.html # Shared base template
│     └── home.html # Home page content
│     └── guestbook.html # Guestbook form and entries 

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💡 How It Works

• Routes:

  • / – Home
  • /guestbook – View and submit entries
  • /reset – (Bonus) Clears all messages

• Templates:

  • base.html provides the layout
  • Other pages extend base.html using {% extends %}

• Styling:

  • Basic form and navigation styling in style.css

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🛠️ Getting Started

1. Install Dependencies

pip install Flask

2. Run the App

python app.py

3. Open in Browser

Go to http://127.0.0.1:5000

📦 Features

✅ Clean template structure

✅ Dynamic routing with url_for

✅ Form validation with required fields

✅ Auto-redirect on submission to prevent resubmission

✅ Reset functionality for demo/testing

📚 Next Steps

Connect to SQLite or another database

Add user sessions and flash messages

Deploy to Heroku or Render

📄 License

MIT – Free to use, modify, and distribute.

🙋‍♀️ Author

Made with ❤️ by Ajita Gupta
Follow the tutorial series on Medium