How do I secure my API endpoints?

API security essentials:

1. Authentication

Use OAuth 2.0 or JWT tokens. Never use API keys in URLs.

2. Authorization

Verify users have permission for requested resources. Implement role-based access.

3. Rate Limiting

Prevent abuse by limiting requests per user/IP.

4. Input Validation

Validate and sanitize all inputs. Use parameterized queries.

5. HTTPS Only

Encrypt all traffic. Redirect HTTP to HTTPS.

6. CORS Configuration

Restrict which domains can access your API.

7. Security Headers

Add headers like Content-Security-Policy, X-Frame-Options.

8. Logging and Monitoring

Log all access attempts. Monitor for suspicious patterns.

9. Version Your API

Allow deprecating insecure versions.

10. Error Handling

Never expose stack traces or internal details in responses.

I am building a REST API and want to make sure it is secure. What are the essential security measures I should implement to protect my API from attacks?