kotlin-electron/electron.core/SystemPreferences/promptTouchID

promptTouchID

abstract fun promptTouchID(reason: String): Promise<Void>(source)

resolves if the user has successfully authenticated with Touch ID.

This API itself will not protect your user data; rather, it is a mechanism to allow you to do so. Native apps will need to set Access Control Constants like kSecAccessControlUserPresence on their keychain entry so that reading it would auto-prompt for Touch ID biometric consent. This could be done with node-keytar, such that one would store an encryption key with node-keytar and only fetch it if promptTouchID() resolves.