Web Change Monitor Application Development by Nisa TekWeb Change Monitor Application Development by Nisa Tek

Web Change Monitor Application Development

Nisa Tek

Completed work

Data Analyst

BeautifulSoup

Python

SQLite

Computer Software

Web Change Monitor

A configurable Python application that monitors selected elements on web pages, stores previous values in SQLite, detects content changes, and records a change history.

Project Purpose

The purpose of this project is to monitor selected content on static web pages and detect when that content changes.

Users can add a page URL and a CSS selector, store the latest value in SQLite, compare it with future results, and review the recorded change history.

Features

Add web pages using a name, URL, and CSS selector

Validate page URLs and CSS selectors before saving

Store monitored pages and latest values in SQLite

Check all monitored pages for content changes

Record old and new values when a change is detected

View the complete change history

Delete monitored pages by ID

Log application activity and monitoring results

Handle invalid input, connection errors, and missing elements

Technologies Used

Python

Requests

Beautiful Soup

SQLite

Logging

pathlib

Project Structure

web-change-monitor/ ├── main.py ├── scraper.py ├── database.py ├── monitor.py ├── logger.py ├── requirements.txt ├── .gitignore └── README.md

Installation

Clone the repository:

git clone https://github.com/niisa0/web-change-monitor.git

Navigate to the project directory:

cd web-change-monitor

Install the required packages:

pip install -r requirements.txt

Usage

Run the application:

python main.py

The application displays the following menu:

1 - Add monitored page
2 - List monitored pages
3 - Check all pages
4 - Show change history
5 - Delete monitored page
6 - Exit

Demo

How It Works

The user adds a page name, URL, and CSS selector.

The application validates the page and selector before saving.

The monitored page is stored in SQLite.

Requests downloads the page content.

Beautiful Soup extracts the selected element.

The current value is compared with the previously stored value.

If a change is detected, the old and new values are recorded.

Monitoring activity is written to a log file.

Limitations

The current version supports static web pages.

JavaScript-rendered content is not supported yet.

Some websites may block automated requests.

CSS selectors may need to be updated if a website changes its HTML structure.

Users are responsible for following each website's terms of service and robots.txt rules.

Future Improvements

Telegram and email notifications

Automatic scheduled monitoring

Retry support for temporary connection failures

CSV and Excel import/export

Automated tests with pytest

Dynamic website support with Selenium or Playwright

A web interface for managing monitored pages

Project Status

Version 1.0 is complete and functional.

The current version supports static page monitoring, SQLite storage, change detection, input validation, error handling, and logging.

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Completed work

Posted Aug 3, 2026

A Python application that monitors webpage elements, detects content changes, stores results in SQLite, and maintains a history of changes.

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Timeline

Jul 27, 2026 - Jul 28, 2026