How to Add Biometric Authentication to a Flutter App Using local_auth

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Biometric authentication allows mobile app users to log in securely without passwords, using Face ID, Touch ID, or fingerprint recognition. Flutter developers can implement this feature using the official local_auth package, which abstracts platform differences across Android and iOS into a single unified API. Proper setup requires platform-specific configuration, including AndroidManifest.xml permissions and an NSFaceIDUsageDescription entry in iOS's Info.plist to prevent crashes. A production-ready implementation typically involves a dedicated service class that checks device support, retrieves available biometric types, and handles authentication with error fallback. Common pitfalls include skipping platform configuration steps and failing to handle cases where biometrics are unavailable on a given device.

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ProgrammingDEV Community ·

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