What is Inertia.js?

Inertia.js is a library that lets you build single page applications using classic server side routing and controllers, with React, Vue, or Svelte as the frontend layer. Instead of building a separate API consumed by a separate frontend, your Laravel controllers return Inertia responses that hydrate page components on the client. The result feels like a SPA to the user but is built like a traditional server rendered application. No client side routing, no separate API, no token authentication overhead, no CORS headaches.