@react-native-community/async-storage

What is @react-native-community/async-storage?

@react-native-community/async-storage is an asynchronous, unencrypted, persistent, key-value storage system for React Native. It is designed to store small amounts of data, such as user preferences, app settings, or other lightweight data that needs to persist across app sessions.

What are @react-native-community/async-storage's main functionalities?

Store Data

This feature allows you to store a key-value pair in the storage. The `setItem` method is used to save the data asynchronously.

async function storeData(key, value) {
  try {
    await AsyncStorage.setItem(key, value);
  } catch (e) {
    // saving error
    console.error(e);
  }
}

Retrieve Data

This feature allows you to retrieve a value by its key from the storage. The `getItem` method is used to fetch the data asynchronously.

async function retrieveData(key) {
  try {
    const value = await AsyncStorage.getItem(key);
    if (value !== null) {
      // value previously stored
      return value;
    }
  } catch (e) {
    // error reading value
    console.error(e);
  }
}

Remove Data

This feature allows you to remove a key-value pair from the storage. The `removeItem` method is used to delete the data asynchronously.

async function removeData(key) {
  try {
    await AsyncStorage.removeItem(key);
  } catch (e) {
    // remove error
    console.error(e);
  }
}

Merge Data

This feature allows you to merge an existing value with a new value for a given key. The `mergeItem` method is used to update the data asynchronously.

async function mergeData(key, value) {
  try {
    await AsyncStorage.mergeItem(key, value);
  } catch (e) {
    // merge error
    console.error(e);
  }
}

Clear All Data

This feature allows you to clear all key-value pairs from the storage. The `clear` method is used to remove all data asynchronously.

async function clearAllData() {
  try {
    await AsyncStorage.clear();
  } catch (e) {
    // clear error
    console.error(e);
  }
}

Other packages similar to @react-native-community/async-storage

react-native-mmkv

react-native-mmkv is a fast, small, and easy-to-use key-value storage library for React Native. It is based on Facebook's MMKV storage library and offers better performance and lower memory usage compared to @react-native-community/async-storage.

react-native-encrypted-storage

react-native-encrypted-storage provides a secure and encrypted storage solution for React Native applications. It uses the device's secure storage mechanisms to store data, making it more secure than @react-native-community/async-storage, which does not encrypt data.

redux-persist

redux-persist is a library that allows you to persist and rehydrate a Redux store. It can be used with various storage backends, including AsyncStorage. It is more suitable for applications that use Redux for state management and need to persist the entire state.

README

React Native Async Storage

An asynchronous, persistent, key-value storage system for React Native.

Getting Started

# Install
$ yarn add @react-native-community/async-storage

# Link
$ react-native link @react-native-community/async-storage

See docs for manual linking guide.

Usage

Import

import AsyncStorage from '@react-native-community/async-storage';

Store data

storeData = async () => {
  try {
    await AsyncStorage.setItem('@storage_Key', 'stored value')
  } catch (e) {
    // saving error
  }
}

Read data

getData = async () => {
  try {
    const value = await AsyncStorage.getItem('@storage_Key')
    if(value !== null) {
      // value previously stored
    }
  } catch(e) {
    // error reading value
  }
}

useAsyncStorage hook

React hooks (introduced in 16.8) allow you to use state and async requests without writing a class. For more info on hooks and how to use them, see hooks documentation or the hooks example in this repo.

useAsyncStorage has no hard-coded dependencies in react hooks, it is just a convenience wrapper around AsyncStorage.

import { useAsyncStorage } from '@react-native-community/async-storage';

const {
  getItem,
  setItem,
  mergeItem,
  removeItem
} = useAsyncStorage('@storage_key');

See docs for api and more examples.

Contribution

See the CONTRIBUTING file for how to help out.

License

MIT