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Here’s a step-by-step guide on how to integrate Metamask with React EthersJS and use it as the RPC provider for your Ethereum-based application:

Step 1: Set up MetaMask

Make sure you have MetaMask installed on your browser. If not, download and install it from [MetaMask official website](

Step 2: Create a Web3 Provider instance with Metamask

Create a new file named web3.js in the root of your project directory:

// web3.js

const Web3 = require('web3');


class EthersProvider {

  constructor() {

    const providerUrl = window.ethereum.selectedAddress;

    const networkId = window.ethereum.chainId;


    const web3 = new Web3(window.ethereum);


    if (providerUrl && networkId) {

      return web3.providers EthersProvider({

        provider: providerUrl,

        chainId: networkId

      });

    } else {

      console.error('No MetaMask provider found');

      throw new Error('MetaMask not installed or selected address not found');

    }

  }

}


module.exports = EthersProvider;

This code creates a class EthersProvider that sets up the Web3 instance with Metamask as the RPC provider. The constructor checks if the MetaMask provider URL and network ID are available, and uses them to create a new Web3 instance.

Step 3: Use the EthersProvider in your React app

In your main App.js or index.js file, import the EthersProvider class and use it as the RPC provider for your Ethereum-based application:

// App.js

import React from 'react';

import ReactDOM from 'react-dom';

import Web3Provider from './web3.js';


function App() {

  return (

    

      {/ Your app content here /}

    

  );

}


ReactDOM.render(

  

    

    {/ Your app content here /}

  ,

  document.getElementById('root')

);

Step 4: Use the Web3 instance in your React components

Use the web3 instance to call Ethereum functions and interact with the blockchain. For example:

// MyComponent.js

import React, { useState } from 'react';

import web3Provider from './web3.js';


function MyComponent() {

  const [accountAddress, setAccountAddress] = useState('0x...');


  async function handleGetBalance() {

    const balance = await web3Provider.eth.getBalance(accountAddress);

    console.log(Account balance: ${balance});

  }


  return (

    

      
My Component

      Get Balance

    

  );

}

This code uses the web3Provider instance to get the current account address and call the getBalance function, which returns the balance of the Ethereum account.

That’s it!

With these steps, you should now have Metamask set up as your RPC provider in React EthersJS. You can use this provider to interact with the blockchain from within your React app.

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