Dev Guide: How to Add Biometric Authentication to React Native Apps

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A technical guide published on DEV Community outlines how to integrate biometric authentication into React Native applications using the @sbaiahmed1/react-native-biometrics library. The library supports Fingerprint, Face ID, Touch ID, Iris Scanner, and device PIN fallback across both Android and iOS platforms. It goes beyond basic authentication prompts by offering hardware-backed cryptographic key management, biometric enrollment detection, and compatibility with the React Native New Architecture and Expo. Developers must configure platform-specific permissions, including AndroidManifest entries for Android and an NSFaceIDUsageDescription in iOS Info.plist for Face ID access. The guide positions biometric authentication as a solution to common password-related security and usability problems in mobile apps.

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