unsanitized user input, which could allow an attacker to inject malicious SQL code. To mitigate this risk, you should use parameterized queries or prepared statements. 3. JWT Secret Hardcoded: The JWT secret key is hardcoded in the “loginHandler” function, which is not a good practice. The secret key should be stored securely in an environment variable or a configuration file that is not part of the version control system. 4. Error handling: The code does not check for errors when calling the “token.SignedString(key)” function, which could lead to unexpected behavior. It’s important to handle errors properly to avoid potential security issues. 5. Lack of HTTPS: The server is listening on HTTP, which means that the communication between the client and the server is not encrypted. To ensure secure communication, use HTTPS instead. 97