Overview

Ethers.js is a powerful library for interacting with the Ethereum blockchain, while Redux is a popular state management library for JavaScript applications. Integrating Ethers.js with Redux allows you to manage blockchain-related state in a centralized manner, making it easier to share data across your application. This guide will walk you through the process of using Ethers.js with Redux in a React application.

1. Setting Up Your React Project

First, create a new React project and install the necessary dependencies:

        
            npx create-react-app my-dapp
            cd my-dapp
            npm install ethers redux react-redux
            

2. Setting Up Redux

Next, set up Redux in your application. Create a Redux store and a slice for managing Ethereum-related state.

        
            // src/store.js
            import { createStore } from 'redux';

            const initialState = {
                account: null,
                balance: null,
            };

            const reducer = (state = initialState, action) => {
                switch (action.type) {
                    case 'SET_ACCOUNT':
                        return { ...state, account: action.payload };
                    case 'SET_BALANCE':
                        return { ...state, balance: action.payload };
                    default:
                        return state;
                }
            };

            const store = createStore(reducer);
            export default store;
            

3. Integrating Ethers.js with Redux

Now, you can integrate Ethers.js with Redux to manage the Ethereum account and balance. Use the Redux store to dispatch actions when the user connects their wallet and fetches their balance.

        
            // src/App.js
            import React, { useEffect } from 'react';
            import { useDispatch, useSelector } from 'react-redux';
            import { ethers } from 'ethers';
            import store from './store';

            function App() {
                const dispatch = useDispatch();
                const account = useSelector(state => state.account);
                const balance = useSelector(state => state.balance);

                useEffect(() => {
                    const connectWallet = async () => {
                        if (window.ethereum) {
                            const provider = new ethers.providers.Web3Provider(window.ethereum);
                            await provider.send("eth_requestAccounts", []);
                            const signer = provider.getSigner();
                            const address = await signer.getAddress();
                            dispatch({ type: 'SET_ACCOUNT', payload: address });

                            const balance = await provider.getBalance(address);
                            dispatch({ type: 'SET_BALANCE', payload: ethers.utils.formatEther(balance) });
                        } else {
                            alert("Please install MetaMask!");
                        }
                    };

                    connectWallet();
                }, [dispatch]);

                return (
                    

                        
Connect to Ethereum

                        {account ? (
                            

                                
Connected account: {account}

                                
Balance: {balance} ETH

                            

                        ) : (
                            Connect Wallet
                        )}
                    

                );
            }

            export default App;
            

4. Providing the Redux Store

Wrap your application with the Redux Provider to make the store available throughout your component tree.

        
            // src/index.js
            import React from 'react';
            import ReactDOM from 'react-dom';
            import { Provider } from 'react-redux';
            import store from './store';
            import App from './App';

            ReactDOM.render(
                
                    
                ,
                document.getElementById('root')
            );
            

Conclusion

By integrating Ethers.js with Redux, you can effectively manage Ethereum-related state in your React application. This approach allows for a more organized and scalable way to handle blockchain interactions, making it easier to share data across components. Following the steps outlined in this guide, you can set up your project, connect to the Ethereum network, and manage user accounts and balances using Redux.