Keychain

Data persistence ​

react-native-keychain provides a persistent data storage solution that survives app restarts and updates. However, it should not be relied upon as the sole source of truth for irreplaceable or critical data. Data stored using react-native-keychain is erased when the app is uninstalled. The exception is iOS, where stored data can persist across app reinstalls due to the way iOS handles keychain storage.

To check if data is available in the keychain/keystore, you can use hasGenericPassword and hasInternetCredentials:

typescript
import * as Keychain from 'react-native-keychain';

const isGenericPasswordAvailable = await Keychain.hasGenericPassword({
  service: 'service_key',
});

const isInternetCredentialAvailable = await Keychain.hasInternetCredentials({
  server: 'https://google.com',
});

iCloud synchronization on iOS ​

cloudSync defaults to false. Omitting it or passing false selects non-synchronizable keychain items; true selects synchronizable items. Use the same value when storing, reading, checking, and resetting credentials. These queries match separate items, even when the service or server is the same. See Apple's kSecAttrSynchronizable documentation.