List important files in app routing system.
Here are common files which we use in app routing system:
layout.js
page.js
loading.js
not-found.js
error.js
global-error.js
route.js:
template.js
default.js
other files used in the system are:
middleware.js
forbidden.js
unauthorized.js
head.js
mdx-components.js
instrumentation.js