Sentiment Analysis Web App

A Flask-based web application that analyzes the sentiment of any text using NLP techniques.

Features

• Detects Positive / Negative / Neutral sentiment
• Shows confidence score and progress bar
• Highlights matched positive/negative keywords
• Handles negation ("not good" → negative)
• Handles intensifiers ("very amazing" → stronger signal)
• 3 sample texts to test quickly
• Ctrl+Enter shortcut to analyze

How to Run

1. Install dependencies:

   pip install flask
   

2. Run the app:

   python app.py
   

3. Open in browser:

   http://127.0.0.1:5000
   

Project Structure

1_sentiment_analysis/
├── app.py                  ← Flask backend + NLP logic
├── requirements.txt
├── templates/
│   └── index.html          ← Frontend UI
└── static/
    ├── css/style.css       ← Styling
    └── js/main.js          ← Frontend logic

Tech Stack

• Python, Flask
• Custom lexicon-based NLP (no downloads needed)
• HTML, CSS, Vanilla JavaScript