Integrating MetaMask with React Native App: Retrieving User Public Address

As you embark on your project, ensuring seamless integration of third-party services is crucial for a robust and user-friendly experience. In this article, we’ll guide you through setting up Metamask in your React Native app to retrieve the user’s public address.

Prerequisites

• Make sure you have Node.js installed on your machine.

• Install Metamask CLI by running npm install -g metamask-cli or yarn global add metamask-cli.

• Create a new MetaMask wallet account and obtain your private key (also known as the "metamask private key").

• Familiarize yourself with the React Native library for interacting with the web browser, specifically Web NFC and Web Wallet APIs.

Step 1: Install required libraries

In your project directory, run the following command to install the necessary libraries:

npm install @react-native-web-nfc @react-native-web wallet

or

yarn add @react-native-web-nfc @react-native-web wallet

Step 2: Configure MetaMask API

Create a new file named meta_mask.js in the same directory as your project's main index.js file. This file will serve as an entry point for interacting with Metamask.

import WebNFC from '@react-native-web-nfc';

import { Wallet } from '@react-native-web wallet';


const MetaMaskApi = () => {

  const handleWebNFC = async () => {

    try {

      await WebNFC.requestPermission();

    } catch ( error ) {

      console.error('Error requesting permission:', error);

    }

  };


  return (

    

      webNfcHandler={handleWebNFC}

      walletName="MetaMask"

      privateKey="your_metamask_private_key_here"

    />

  );

};


export default MetaMaskApi;

Step 3: Integrate Metamask App to React Native

In your index.js file, import and initialize the MetaMask API:

import React from 'react';

import ReactDOM from 'react-dom';

import MetaMaskApi from './meta_mask';


const App = () => {

  const handleMetamaskReady = async (wallet) => {

    if (wallet) {

      console.log('Metamask wallet ready:', wallet);

      // Use the wallet instance to retrieve the user's public address

      const publicKey = await wallet.getPublicAddress();

      return publicKey;

    }

  };


  React.useEffect(() => {

    MetaMaskApi.handleWebNFC().then((wallet) => handleMetamaskReady(wallet));

  }, []);


  return 
Metamask App
;

};


ReactDOM.render(, document.getElementById('root'));

Step 4: Use the Retrieved Public Key

After initializing Metamask, your app can retrieve the user's public address using the getPublicAddress() method of the wallet instance.

const publicKey = await wallet.getPublicAddress();

console.log(publicKey);

Conclusion

In this article, we’ve successfully integrated MetaMask into a React Native app to retrieve the user’s public address. By following these steps, you can integrate Metamask seamlessly with your project and provide a robust experience for users.

Remember to replace your_metamask_private_key_here with your actual private key obtained from MetaMask.

Thank you for reading! If you have any questions or need further assistance, please do not hesitate to ask.