Metamask: Deploy smart contract with metamask ethers.js and ganache

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Here is a high-quality article on deploying smart contracts with Metamask using Ethers.js and Ganache:

Deploying Smart Contracts with Metamask: A Step-by-Step Guide

When building decentralized applications (dApps) on the Ethereum blockchain, you need to deploy smart contracts that execute specific logic. One popular tool for deploying smart contracts is Metamask, a browser extension that allows you to interact with your Ethereum wallet and deploy contracts directly from your web browser.

In this article, we will walk through the process of deploying a simple smart contract using Ethers.js, a popular JavaScript library for interacting with the Ethereum blockchain, and Ganache, a local Ethereum testnet simulator.

Prerequisites

Before you start, make sure you have:

• An Ethereum wallet (such as MetaMask)

• A copy of Remix, a web-based development tool that allows you to compile and deploy smart contracts

• A React project with a JSON file containing the contract code

Step 1: Compile the Smart Contract with Remix

First, let’s compile our smart contract using Remix. Open Remix and select “Compile” > “Contract” from the menu.

Choose your contract code as input and click “Compile”. Remix will create an Ethereum ABI (Application Binary Interface) file that represents the contract’s interface.

Step 2: Create a New Ethers.js Contract

In our React project, let’s create a new Ethers.js contract using the compiled ABI. We’ll call this contract MyContract. In your React component, import Ethers and use its useContract hook to deploy the contract.

import { useContract } from '@metamask/web-api';


const MyContractAddress = '0x...'; // Replace with your contract address


function App() {

  const contract = useContract(MyContractAddress);


  return 
My Contract deployed at: {contract.address}
;

}

Step 3: Deploy the Smart Contract using Metamask

Now, let’s deploy our smart contract using Metamask. First, create a new file called metamask.js in your React project root. This file will contain the logic for deploying the contract.

import { useContract } from '@metamask/web-api';

import { ethers } from 'ethers';


const deployContract = async () => {

  const MyContractAddress = '0x...'; // Replace with your contract address


  // Get a new browser window for Metamask deployment

  const window = await window.openMetamaskWindow();


  // Set the contract ABI and address

  const abi = await ethers.getABI(MyContractAddress);

  const contract = await ethers.deployMyContract(window, abi);


  console.log(Contract deployed at: ${contract.address});


  // Close the Metamask window

  await window.close();

};


deployContract();

Step 4: Use Ethers.js to Interact with the Deployed Contract

Now that we’ve deployed our smart contract using Metamask, let’s use Ethers.js to interact with it. We’ll create a new file called contract.js in your React project root.

import { useContract } from '@metamask/web-api';


const MyContractAddress = '0x...'; // Replace with your contract address


function useMyContract() {

  const contract = useContract(MyContractAddress);


  return contract;

}


export default { MyContract: useMyContract().contract };

Step 5: Import and Use the Deployed Contract in React

Finally, let’s import the deployed contract in our React component.

import React from 'react';

import ReactDOM from 'react-dom';

import MyContract from './contract';


function App() {

  const contract = useMyContract().contract;


  return 
My Contract: {contract.address}
;

}

That’s it! You’ve successfully deployed a smart contract using Metamask and Ethers.js in your React project.

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