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

Metamask: react ethersjs metamask with Custom RPC provider

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

);

}

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

That’s it!

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

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