Metamask: How do I connect my React Web mobile app to metamask?

Here’s an article on how to connect your React web app to the MetaMask mobile app:

How ​​to connect the MetaMask wallet to your React web app

In this guide, we’ll walk you through the process of connecting your React web app to the MetaMask wallet, allowing users to securely manage their Ethereum accounts and interact with your app.

Step 1: Create a MetaMask extension

Before you connect your React web app to MetaMask, you need to create an extension for Android and iOS devices. This will allow users to access your app directly from the browser or mobile device.

To create the MetaMask extension:

• Go to the MetaMask website ([ in Chrome)

• Click “Create Extension”

• Select “Android” as the platform and click “Next”

• Fill in your name, email, and password

• Set up your Google Chrome account (for Android)

• Upload a manifest file to register your extension

• Publish your extension for public use

For iOS:

• Go to the App Store (on an iPhone or iPad) and search for “MetaMask”

• Tap “Get” to download and install MetaMask on your device

• Open MetaMask and tap “Add Extension”

• Follow the same steps as above to register your extension

Step 2: Integrate with your React web app

Once you’ve created a MetaMask extension, you can now integrate it with your React web app. This will allow users to access MetaMask directly from their browser or mobile device.

To do this:

• In your React app’s index.js file, import the MetaMask library and configure it:

import { MetaMask } from 'web3-react';
const MetaMaskProvider = ({ account }) => {
const [account, setAccount] = useState(account || '');
return (
ref={metaMaskRef}
type="module"
id="react-metamask-client"
async config={{ accounts: [] }}
accounts={[]} // This is where you'll configure MetaMask to allow your app to access specific accounts
injectScripts={() => {}} // Optional: Inject scripts and styles from the MetaMask library
/>
);
};

In this example, we import the MetaMask library and define a provider component that wraps our React app. We pass an array of accounts to the accounts property, which will configure MetaMask to allow your app to access those specific accounts.

Step 3: Connect to MetaMask

To connect to MetaMask, you’ll need to use its web API. This is where things get interesting: we can’t directly call MetaMask functions from within our React app, because it requires a separate browser tab or window to interact with the extension.

To connect to MetaMask, you’ll need to:

• In your index.js file, import the web3 library and instantiate the Web3 provider:

import Web3 from 'web3';
const web3 = new Web3(new window.ethereum));

Next, use the provider to directly call MetaMask functions. For example:

import { MetaMask } from 'react-metamask-client';
const MetaMaskProvider = ({ account }) => {
const [account, setAccount] = useState(account || '');
return (
ref={metaMaskRef}
type="module"
id="react-metamask-client"
async config={{ accounts: [] }}
accounts={[]} // This is where you'll configure MetaMask to allow your app to access specific accounts
injectScripts={() => {}} // Optional: Inject scripts and styles from the MetaMask library
/>
);
};

To connect to MetaMask, we pass an array of accounts to the accounts property. We can also configure MetaMask settings using its web API.

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