Security becomes manageable when it’s a checklist and a habit.

Authentication and authorization

  • Authenticate users (JWT/session) and validate tokens properly.
  • Authorize with roles/permissions (RBAC) at the endpoint boundary.
  • Keep least privilege as the default.

Input validation (always)

  • Validate and normalize inputs (query/body/path).
  • Reject unexpected fields on sensitive endpoints.
  • Protect against over-posting / mass assignment.

Safe error handling

  • Return user-friendly messages.
  • Log the detailed error internally (correlation IDs help a lot).
  • Avoid leaking stack traces or DB details.

Operational controls

  • Rate limiting / throttling on public endpoints.
  • Audit logs for admin actions.
  • Alerting for repeated failures and suspicious patterns.

The “boring” wins

  • HTTPS everywhere
  • secure headers
  • dependency updates
  • secrets management

If you want, I can add a companion post for “JWT + refresh tokens” with concrete implementation details.