Choose Storage

Pick the right Expo storage primitive.

Decision tree

• Tokens, passwords, API keys → expo-secure-store (Keychain on iOS)
• Tiny preferences (<10 keys) → AsyncStorage or Zustand persist
• Fast key/value (>10 keys, frequent reads) → MMKV (react-native-mmkv)
• Structured data, complex queries → expo-sqlite + drizzle-orm
• Large blobs / images → expo-file-system
• Cross-device sync → CloudKit private DB (requires native bridge or expo-cloud-storage if available)

expo-secure-store

import * as SecureStore from 'expo-secure-store';
await SecureStore.setItemAsync('authToken', token);
const token = await SecureStore.getItemAsync('authToken');