flutter_async_storage reads data from React Native's AsyncStorage from within Flutter apps. This is useful for Flutter apps that have migrated from React Native and need to access data stored on disk.

To read data from AsyncStorage in Flutter, you can use a workflow like:

final asyncStorageReader = AsyncStorageReader(LocalPlatform());
try {
if (await asyncStorageReader.exists()) {
    final data = await asyncStorageReader.data('myDataKey');

    // Do something with data...

    // Clear AsyncStorage.
    await asyncStorageReader.clear();
}
} catch (e) {
// Handle error.
}

Data in AsyncStorage is keyed; you can use the data() method on AsyncStorageReader to read arbitrary keys. Data returned is stringified JSON, which you can deserialize to another format. built_value allows you to create custom deserializers which are helpful for converting data to Dart objects.

flutter_async_storage can read from AsyncStorage on both Android and iOS. On Android, AsyncStorage data is stored in a SQLite database in the table RKStorage. On iOS, AsyncStorage data is stored in the filesystem (in a manifest file for smaller data, and sharded into separate files for larger data using a hash function). flutter_async_storage mimics the path taken to retrive data by React Native's AsyncStorage.

The platform must be specified in the constructor for AsyncStorageReader, but the API is the same.