Security Vulnerabilities

SQL Injection:

To avoid SQL injection attacks, use parameterized queries or prepared statements to prevent malicious SQL code from being executed:

db.query('SELECT * FROM users WHERE id = ?', [userId]);

Also validate and sanitize user inputs to ensure it doesn't contain characters that might interfere with SQL statements.

Cross-Site Scripting (XSS):

To avoid allowing scripts or dynamic content to affect your page:

1. Escape content before rendering in the browser:

<div>{sanitize(userInput)}</div>

2. Use libraries like DOMPurify to sanitize HTML.

3. Set Content-Security-Policy headers to restrict allowed sources for scripts to trusted sources.