Security is every developer’s responsibility. This checklist covers essential steps to protect your web applications.
OWASP Top 10: Familiarize yourself with the OWASP Top 10 vulnerabilities: Injection, Broken Authentication, Sensitive Data Exposure, XML External Entities, Broken Access Control, Security Misconfigurations, Cross-Site Scripting (XSS), Insecure Deserialization, Using Components with Known Vulnerabilities, and Insufficient Logging.
Input Validation: Never trust user input. Validate on both client and server, use parameterized queries to prevent SQL injection, sanitize HTML to prevent XSS, and validate file uploads.
Authentication: Use bcrypt for password hashing, implement rate limiting on login endpoints, use secure session management, and enable multi-factor authentication for sensitive operations.
HTTPS Everywhere: Redirect HTTP to HTTPS, use HSTS headers, and ensure all third-party resources are loaded over HTTPS.
Headers: Set Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, and Referrer-Policy headers.
Regular security audits and dependency updates are your best defense.