How to secure API endpoints from attacks

· Category: API & REST

Short answer

Securing APIs requires defense in depth against injection, broken authentication, excessive data exposure, and other common attack vectors.

Steps

  1. Validate and sanitize all inputs using strict schemas and allowlists.
  2. Use parameterized queries and ORMs to prevent SQL injection.
  3. Authenticate and authorize every request with strong mechanisms.
  4. Implement rate limiting and throttling to mitigate brute-force and denial-of-service attacks.
  5. Log and monitor requests for anomalies and potential breaches.

Tips

  • Follow the OWASP API Security Top Ten as a baseline checklist.
  • Use Web Application Firewalls with API-specific rule sets.
  • Encrypt data in transit with TLS and enforce strong cipher suites.
  • Minimize data exposure by returning only fields the client is authorized to see.

Common issues

  • Mass assignment vulnerabilities from binding request bodies directly to models.
  • Insecure direct object references allowing access to other users' data.
  • Missing authentication on internal endpoints exposed to the public.
  • Insufficient logging making incident response and forensics difficult.

Example

curl -X GET https://api.example.com/users   -H "Accept: application/json"   -H "Authorization: Bearer $TOKEN"

This curl command demonstrates a standard GET request with headers for content negotiation and bearer token authentication.