react-native-fast-storage is a drop in replacement for AsyncStorage.

This library is the React Native implementation of https://github.com/Tencent/MMKV.

It provides very fast read and write access.

$ npm install react-native-fast-storage --save

$ react-native link react-native-fast-storage

Additional IOS step

If you encounter this error :

ld: warning: Could not find auto-linked framework 'MMKV'

You need to manually follow these steps :

• Open up your project in Xcode
• Select the main target (under "Targets"),
• Go to the "Build Settings" tab, and find the "Framework Search Paths" section.
• Add ../node_modules/react-native-fast-storage/ios (non-recursive) for each of your configurations (e.g. Debug and Release).
• Find the MMKV.framework file in ../node_modules/react-native-fast-storage/ios and drag it into Xcode under the "Frameworks" section. In the dialog that pops up, uncheck "Copy items if needed", choose "Create groups", and ensure your main target is checked under "Add to targets".
• In Xcode, select the project, then select the main target (under "Targets"), then go to the "General" tab and find the "Embedded Binaries" section. Click the "+" icon and select MMKV.framework which appears under "Frameworks" then click "Add".
• In Xcode do "Product" -> "Clean".

import FastStorage from "react-native-fast-storage";

await FastStorage.setItem("key", "Coucou toi");

const item = await FastStorage.getItem("key");

All methods are asynchronous, just like AsyncStorage.