API Security Checklist for Production Applications

APIs are the front door to your data. A single vulnerability can expose user data, enable account takeover, or bring down your service. Here's how to secure them.

Authentication#

Input Validation#

Rate Limiting#

CORS Configuration#

Security Headers#

Authorization#

Sensitive Data Protection#

Error Handling#

Security Checklist#

Conclusion#

API security requires defense in depth—multiple layers of protection. Validate inputs, authenticate requests, authorize access, rate limit, and monitor.

Security is not a feature you add—it's a practice you maintain.