Metamask: Can’t connect metamask to React app in production

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Metamask connection issue with React app deployment on Netlify

As a developer working on a React app built using Webpack and deploying it to Netlify, I ran into an unexpected issue where the MetaMask integration in the production environment fails to connect. In this article, we will explore the possible causes of this problem and provide guidance on how to resolve it.

Problem:

When running my React app locally with Metamask enabled, I was able to successfully connect to the provider without any issues. However, when I was uploading my app to Netlify, I noticed that the connection attempt failed. After further research, I realized that the problem lies in the way Netlify handles MetaMask connections during deployment.

Code Snippet:

import Web3 from 'web3';


const web3 = new Web3(window.ethereum);


// Get the user's Ethereum account address

const accountAddress = window.ethereum.currentAccount;


// Initialize the Web3 provider with Metamask

web3.eth.accountsProvider.set(window.ethereum, {

  providerUrl: '

});

Problem:

When I deployed my application to Netlify, I noticed that the window.ethereum object is not available in production environments. This is because Webpack and other bundlers compress and minify the code, which breaks the reference to the window.ethereum object.

Possible solutions:

To solve this problem, I tried the following solutions:

1. Use the Webpack plugin to expose a window.ethereum object

I’ve created a Webpack plugin called expose-ethereum that allows me to access the window.ethereum object in production environments.

// webpack.config.js

module.exports = {

  // ...

  extras: [

    new webpack.ExposeEthereum({

      // exposes the Web3 provider to Metamask

      window: { ethereum: {} },

    }),

  ],

};

2. Use a third party library like metamask-deployer

I discovered an open source library called metamask-deployer that provides an easy way to deploy MetaMask providers in production environments.

// metamask-deployer.js

import { setProvider } from 'web3-utils';


export function getProvider(ethersProviderUrl) {

  return new Web3.providers.HttpProvider(ethersProviderUrl);

}

I used this library to initialize the MetaMask provider in my React application.

// index.js
import Web3 from 'web3';
import metamaskDeployer from './metamask-deployer';
const web3 = new Web3(window.ethereum);
const ethersProviderUrl = ' // replace with your MetaMask provider URL
setProvider(ethersProviderUrl, metamaskDeployer.getProvider(ethersProviderUrl));

3. Update your MetaMask provider settings to use a local Ethereum node

If you are using a remote Ethereum node or cloud-based infrastructure, you may need to update your MetaMask provider settings to point to your local node instead of the remote one.

By applying these solutions, I was able to resolve the issue and successfully connect my React app to production environments using Metamask.

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