HttpOnly — Your First Line of Defense

📰 Medium · JavaScript

Learn how HttpOnly cookies can enhance security by protecting against JavaScript access, and why they're a crucial first line of defense

intermediate Published 26 Apr 2026

Action Steps

Set HttpOnly flag on sensitive cookies to prevent JavaScript access
Configure your server to include the HttpOnly directive in the Set-Cookie header
Test your application to ensure HttpOnly cookies are being set correctly
Review your authentication flow to identify potential vulnerabilities
Implement additional security measures, such as Secure and SameSite flags, to further protect cookies

Who Needs to Know This

Developers and security teams can benefit from understanding HttpOnly cookies to improve application security, especially when handling sensitive authentication data

Key Insight

💡 HttpOnly cookies can prevent JavaScript from accessing sensitive authentication data, reducing the risk of XSS attacks