In SvelteKit, server endpoints (like +server.js or +server.ts) handle HTTP requests directly. Protecting these endpoints ensures only authorized users can access sensitive data or perform restricted actions.
Use authentication to verify users and authorization to control access to resources. You can implement this with sessions, JWT tokens, or third-party OAuth providers.
Always validate and sanitize user input on server endpoints to prevent injection attacks (SQL, NoSQL, or command injection). Never trust client-side validation alone.
Protect endpoints from abuse or brute-force attacks by implementing rate limiting. This can be done with middleware or libraries like express-rate-limit if using a Node adapter.
Set HTTP headers such as CSP, HSTS, and X-Content-Type-Options to harden security. This can be added in hooks.server.js for all endpoints.
Store API keys, database credentials, and other sensitive data in environment variables. Access them only in server code ($env/static/private) to avoid exposing secrets to the client.
Authenticate and authorize every request.
Validate and sanitize all inputs.
Implement rate limiting to prevent abuse.
Use secure HTTP headers and CSP.
Keep secrets in environment variables and never expose them to the client.
Log and monitor access attempts to detect suspicious activity.