MMKV Storage

React Native 6 min min read Updated: Aug 03, 2026 Intermediate
MMKV Storage
Intermediate Topic 2 of 15

MMKV Storage

MMKV is a high-performance key-value storage library originally developed by WeChat, offering significantly faster read and write speeds compared to AsyncStorage in React Native applications.

Installing MMKV

bash npm install react-native-mmkv

Creating an MMKV Instance

javascript import { MMKV } from 'react-native-mmkv'; export const storage = new MMKV();

Storing and Retrieving Data

javascript storage.set('username', 'JohnDoe'); const username = storage.getString('username');

Storing Different Data Types

MMKV supports storing strings, numbers, and booleans directly, without requiring manual conversion for basic types.

javascript storage.set('age', 25); storage.set('isLoggedIn', true); const age = storage.getNumber('age'); const isLoggedIn = storage.getBoolean('isLoggedIn');

Storing Objects

javascript storage.set('user', JSON.stringify({ name: 'John', age: 25 })); const user = JSON.parse(storage.getString('user'));

Why MMKV is Faster

Unlike AsyncStorage, which operates asynchronously through a bridge, MMKV uses a native, synchronous implementation backed by memory-mapped files, resulting in significantly faster read and write operations.

Using MMKV with Zustand or Redux Persist

MMKV can be integrated as a custom storage engine for state management persistence libraries, offering a performance boost over the default AsyncStorage-based approach.

Conclusion

MMKV provides a significantly faster alternative to AsyncStorage for React Native applications requiring frequent local storage access, making it an excellent choice for performance-sensitive apps.

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