AsyncStorage in React Native to Store Data in Session

AsyncStorage in React Native to Store Data in Session

This is an Example to Store Data in Session Using AsyncStorage in React Native. React Native AsyncStorage can be used to manage sessions.

If you want the user to log in once and don’t want to log in again when the user opens the app after some time then, you have to store any variable in the app which can be checked and according to that, we will show the screen.

For example, once we login we can store the user id in the AsyncStorage to remember the user and when we open the app again we check for the user id, If it is there in the AsyncStorage then we can directly send the user to the next screen without login else we will show the Login Screen. This process is called session management using AsyncStorage.

AsyncStorage can only be used to store small values in the form of a key and value pair because it has some limitation to store the data. You can store your value with respect to any key and then can access the value using the key again. It works perfectly on both platforms (Android and IOS).

Under the Lean Core Project AsyncStorage has been moved to its new home @react-native-community/react-native-async-storage after the launch of React Native 0.59. If you are using React Native >= 0.59 then please follow the instruction for React Native >= 0.59.

To Import AsyncStorage in Code

For React Native < 0.59

After React Native >= 0.59

Store the value in AsyncStorage

Get the value from the AsyncStorage

In this Example. We will see the use of AsyncStorage by storing some value and after that, we will retrieve the value from the same key. So let’s get started.

To Make a React Native App

Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react-native init to make our React Native App. Assuming that you have node installed, you can use npm to install the react-native-cli command line utility. Open the terminal and go to the workspace and run
npm install -g react-native-cli
Run the following commands to create a new React Native project
react-native init ProjectName
This will make a project structure with an index file named App.js in your project directory.


Additional Step for React Native >= 0.59

as we are using @react-native-community/react-native-async-storage in React Native >= 0.59 then we have to install and link the dependency.

Installation of Dependency

To use AsyncStorage we need to install @react-native-community/react-native-async-storage dependency.

To install this open the terminal and jump into your project using

Run the following command to install

This command will copy all the dependency into your node_module directory.

–save is optional, it is just to update the @react-native-community/react-native-async-storage dependancy in your package.json file.

Linking of Dependency

After installing the dependency you need to link it with your project using

After linking the dependency if you face Could not Compile Settings File project/android/settings.gradle error while building and installing the project then you can find the solution here.


Now, Open App.js in any code editor and replace the code with the following code.

App.js

To Run the React Native App

Open the terminal again and jump into your project using.
cd ProjectName
To run the project on an Android Virtual Device or on real debugging device
react-native run-android
or on the iOS Simulator by running
react-native run-ios (macOS only).

Android

IOS

       

That was the React Native AsyncStorage. If you have any doubt or you want to share something about the topic you can comment below or contact us here. The remaining components will be covered in the next article. Stay tuned!

Hope you liked it. 🙂

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