Clearing Storage and Migration Strategies
Use multiRemove and clear for selective and full cache clearing, and implement a versioned migration strategy to handle storage schema changes across app updates.
Why Storage Maintenance Matters
As your app evolves across versions, the data structure you store in AsyncStorage may change. Old data from previous app versions might not match what the new code expects, leading to crashes or incorrect behavior. A solid storage maintenance strategy — including selective clearing and versioned migrations — is essential for apps that have real users with existing data.
Removing Specific Keys with multiRemove
AsyncStorage.multiRemove accepts an array of key strings and deletes all of them in a single operation. This is more efficient than calling removeItem repeatedly in a loop. Use it when a user action should clear a specific subset of data — for example removing all cached API responses without touching user preferences.
async function clearCache() {
const cacheKeys = [
'posts_cache',
'comments_cache',
'user_feed_cache',
];
try {
await AsyncStorage.multiRemove(cacheKeys);
console.log('Cache cleared');
} catch (err) {
console.error('Failed to clear cache:', err);
}
}All lessons in this course
- Reading and Writing with AsyncStorage
- Storing and Parsing JSON Objects
- Building a Persistent Settings Screen
- Clearing Storage and Migration Strategies