log-in webpage with backend by Ansh Yadav

This project is a web based Login Authentication System developed using HTML CSS Python Flask JSON and OS modules. The project provides a simple login interface where registered users can enter their phone number and password to access the system. The HTML file creates the login form and CSS is used to design the page layout, background, input fields, buttons, and overall appearance. The Python Flask backend receives the login details through a POST request and validates the entered phone number before checking the stored user information. The system reads registered user data from a JSON based signup data file and compares the entered phone number with the stored phone number. If the phone number is registered, the entered password is compared with the stored password. The application displays an appropriate message for successful login, incorrect password, unregistered phone number, or an invalid phone number. This project demonstrates practical implementation of Flask routing, HTML forms, POST requests, JSON data handling, file reading, user authentication, and basic input validation.

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