Here is a step-by-step guide on how to integrate Metamask with React EthersJS and use it as an 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 the [official MetaMask website](

Step 2: Create an instance of the Web3 Provider 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: chain ID

      });

    } otherwise {

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

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

    }

  }

}


module.exports = EthersProvider;

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

Step 3: Use 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 app:

// 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 a 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...');


  asynchronous function handleGetBalance() {

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

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

  }


  return (

    

      
My component

      Get balance