react-native-async-storage - Amazon Vega Docs

@amazon-devices/react-native-async-storage__async-storage is an extension of react-native-async-storage/async-storage that enables its use in React Native for Vega apps. The library supports an asynchronous, unencrypted, persistent, key-value storage system for React Native for Vega apps and is usable in both TypeScript and JavaScript. This library is system-deployed and available to React Native for Vega apps without a separate installation process. The library is deployed as an autolinking library, which your app links to at runtime. The library is guaranteed to be compatible only with the version of React Native for Vega for which it’s built. When you uplevel your app’s version of React Native for Vega, consider the best practice of upleveling its library dependencies.

Install the library

Add the JavaScript library dependency in your app’s package.json.

"dependencies": {
  ...
  "@amazon-devices/react-native-async-storage__async-storage": "~2.0.2+1.23.1",
  "@react-native-async-storage/async-storage": "1.23.1",
  ...
}

Reinstall the package-lock.json file using the npm install command.

Examples

Storing data

Storing the string value

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

const storeData = async (value) => {
  try {
    await AsyncStorage.setItem('my-key', value);
  } catch (e) {
    // saving error
  }
};

Storing the object value

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

const storeData = async (value) => {
  try {
    const jsonValue = JSON.stringify(value);
    await AsyncStorage.setItem('my-key', jsonValue);
  } catch (e) {
    // saving error
  }
};

Reading data

Reading the string value

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

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

Reading the object value

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

const getData = async () => {
  try {
    const jsonValue = await AsyncStorage.getItem('my-key');
    return jsonValue != null ? JSON.parse(jsonValue) : null;
  } catch (e) {
    // error reading value
  }
};

API reference

Prop	Description	Default
`getItem`	Gets a string value for given key. This function can either return a string value for existing key or return null otherwise. In order to store object value, you must deserialize it, for example using JSON.parse(). Note (legacy): you can use an optional callback as an alternative for a returned promise.	None
`setItem`	Sets a string value for given key. This operation can either modify an existing entry, if it did exist for given key, or add new one otherwise. In order to store object value, you must serialize it, for example using JSON.stringify(). Note (legacy): you can use an optional callback as an alternative for a returned promise.	None
`mergeItem`	Merges an existing value stored under key, with new value, assuming both values are stringified JSON.	None
`removeItem`	Removes item for a key, invokes (optional) callback once completed.	None
`getAllKeys`	Returns all keys known to your App, for all callers, libraries, etc. Once completed, invokes callback with errors (if any) and array of keys.	None
`multiGet`	Fetches multiple key-value pairs for given array of keys in a batch. Once completed, invokes callback with errors (if any) and results.	None
`multiSet`	Stores multiple key-value pairs in a batch. Once completed, a callback with any errors get called.	None
`multiMerge`	Multiple merging of existing and new values in a batch. Assumes that values are stringified JSON. Once completed, invokes callback with errors (if any).	None
`multiRemove`	Clears multiple key-value entries for given array of keys in a batch. Once completed, invokes a callback with errors (if any).	None
`clear`	Removes whole AsyncStorage data, for all clients, libraries, etc. You probably want to use removeItem or multiRemove to clear only your App’s keys.	None
`useAsyncStorage`	Note: An experimental hooks-like interface. This interface will change in the future to fully leverage the Hooks API, so feel free to follow this discussion to learn more. The useAsyncStorage hook returns an object that exposes all methods that allow you to interact with the stored value.	None

For more details and usage examples, see react-native-async-storage/async-storage library’s documentation.

Supported versions

Package name	Amazon NPM library version	Vega OS build number	Vega SDK version	Release notes
`@amazon-devices/react-native-async-storage__async-storage`	2.0.0+2.13.0	`OS 1.1 (201010438050)`	0.20

Additional resources

For information on other libraries, see Supported Third-Party Libraries and Services.

​Install the library

​Examples

​Storing data

​Storing the string value

​Storing the object value

​Reading data

​Reading the string value

​Reading the object value

​API reference

​Supported versions

​Additional resources