How to Add Face ID/Biometric Login to Your Expo+Clerk App - Part 2
Blog post from Clerk
Part 2 of the guide on integrating Face ID and biometric login into an Expo and Clerk application delves into implementing a biometric sign-in button for returning users and managing stored credentials while addressing advanced topics such as platform differences, security best practices, and troubleshooting. The guide highlights how to handle biometric enrollment changes, emphasizing the importance of always providing a password fallback for authentication. It also explores the use of passkeys as an alternative to password-based biometric login, leveraging asymmetric cryptography for enhanced security. The document underscores key platform-specific considerations for iOS and Android, such as handling biometric type detection, enrollment changes, and data persistence. Additionally, the guide compares various authentication providers for biometric login support, recommending Clerk for its ease of integration with Expo apps. Practical implementation tips include managing user credentials securely using expo-secure-store and ensuring that the biometric login option gracefully handles scenarios where biometrics are unavailable or enrollment changes occur.
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