react-native-mmkv

What is react-native-mmkv?

react-native-mmkv is a fast, small, and easy-to-use key-value storage library for React Native. It leverages Facebook's MMKV storage library to provide efficient and secure storage solutions for mobile applications.

What are react-native-mmkv's main functionalities?

Basic Key-Value Storage

This feature allows you to store and retrieve basic key-value pairs. The code sample demonstrates how to set and get a string value using MMKV.

import MMKVStorage from 'react-native-mmkv-storage';

const MMKV = new MMKVStorage.Loader().initialize();

// Set a value
MMKV.setString('username', 'john_doe');

// Get a value
const username = MMKV.getString('username');
console.log(username); // Output: john_doe

Object Storage

This feature allows you to store and retrieve objects. The code sample demonstrates how to set and get an object using MMKV.

import MMKVStorage from 'react-native-mmkv-storage';

const MMKV = new MMKVStorage.Loader().initialize();

const user = { name: 'John Doe', age: 30 };

// Set an object
MMKV.setMap('user', user);

// Get an object
const storedUser = MMKV.getMap('user');
console.log(storedUser); // Output: { name: 'John Doe', age: 30 }

Encryption

This feature allows you to store data securely using encryption. The code sample demonstrates how to set and get an encrypted string value using MMKV.

import MMKVStorage from 'react-native-mmkv-storage';

const MMKV = new MMKVStorage.Loader().withEncryption().initialize();

// Set a value
MMKV.setString('secret', 'my_secret_value');

// Get a value
const secret = MMKV.getString('secret');
console.log(secret); // Output: my_secret_value

Multi-Instance Support

This feature allows you to create multiple instances of storage, which can be useful for separating different types of data. The code sample demonstrates how to set and get values from different instances using MMKV.

import MMKVStorage from 'react-native-mmkv-storage';

const userStorage = new MMKVStorage.Loader().withInstanceID('user').initialize();
const settingsStorage = new MMKVStorage.Loader().withInstanceID('settings').initialize();

// Set values in different instances
userStorage.setString('username', 'john_doe');
settingsStorage.setBool('darkMode', true);

// Get values from different instances
const username = userStorage.getString('username');
const darkMode = settingsStorage.getBool('darkMode');
console.log(username); // Output: john_doe
console.log(darkMode); // Output: true

Other packages similar to react-native-mmkv

react-native-async-storage

react-native-async-storage is a simple, unencrypted, asynchronous, persistent, key-value storage system that is global to the app. It is more widely used and has a larger community but lacks the performance and encryption features of react-native-mmkv.

react-native-sensitive-info

react-native-sensitive-info provides secure storage for sensitive data, such as login credentials. It uses the device's secure storage mechanisms (Keychain on iOS and Keystore on Android). While it offers strong security, it may not be as fast as react-native-mmkv for general key-value storage.

redux-persist

redux-persist is a library used to persist and rehydrate a Redux store. It supports various storage backends, including AsyncStorage. While it is not a direct competitor, it can be used for state persistence in applications using Redux, offering more flexibility in terms of storage backends.

README

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