It’s quite a big change, depending on how many routes are in play. Migrating to App Router is non-trivial.
Thankfully, the pages directory model is still just fine, so there’s no immense pressure for existing apps to migrate, and it can be done somewhat incrementally.
Thankfully, the pages directory model is still just fine, so there’s no immense pressure for existing apps to migrate, and it can be done somewhat incrementally.