Secure Web Login Page with Front-End Validation and Backend Integration

atlassian Task 2: Login Page Implementation Describe the implementation details of a login page, examining deep engineering knowledge needed in a web application. Requirements are: Use HTML to construct basic input fields including username and password. Front-end validation of username and password format. Implement front-end to back-end communication using JavaScript to complete verification. Ensure the input meets security standards and is sanitized. Implement a login system and provide example usage cases. Example Input {"username": "testuser", "password": "password123"}