Most popular modern apps require an internet connection to a server to operate fully. Sometimes, though, devices are going to be disconnected, so an app needs to be able to “catch up” with the server when it’s reconnected. Incorporating this synchronization into your app is important for attracting more users. With the help of Appery.io API Express and its offline mode, you can do exactly that! As part of this feature, there are a variety of different methods available to handle all the details like switching between online and offline modes, triggering the synchronization, and resetting data that fails to synchronize.