How CSRF Token Rotation Breaks Your Laravel + Inertia.js Fetches

When using fetch() alongside Inertia.js in Laravel, CSRF token mismatches cause 419 errors because the browser reads a stale token from the initial page load while Laravel rotates the actual token with each response. The fix involves reading the fresh token from cookies and properly handling error responses—a critical detail when integrating form submissions with client-side routing.