The REST API is powerful — and risky. Protect it with layered controls while keeping developer ergonomics high. This guide outlines a defense-in-depth checklist.
Authenticate and authorize
- Use nonces for logged‑in actions and capabilities for role‑based access.
- Never rely on client‑provided roles or IDs. Recalculate server‑side.
Endpoint skeleton
register_rest_route('my/v1','item',{
methods:'POST',
callback: fn,
permission_callback: function(){ return current_user_can('edit_posts') && wp_verify_nonce($_REQUEST['_wpnonce'],'my_action'); }
});Validate and sanitize
- Validate inputs server‑side. Sanitize user content before saving and escape on output.
- Return consistent error shapes with HTTP status codes.
Rate limit and observe
Add basic rate limiting and structured logs to detect abuse early. Consider IP + user + route keys.
Transport security
- Require HTTPS; set strict security headers in the admin and front‑end.
- Sign webhooks and verify signatures on receipt.
Logging & monitoring
Log method, route, status, and latency. Create alerts for spikes in 401/403/429 responses.
FAQ
Should I expose admin-only endpoints?
Prefer server actions tied to hooks. If you must, protect with capabilities and CSRF mitigations.
Conclusion
Security doesn't have to kill DX. Bake safety into your endpoint template and ship confidently. More in WP Plugin.
