Dapp Development Tutorials, Guides & Insights

• Use Etherscan if:
• You only need to read blockchain data.
• You want to build tools for analytics or explorers.
• You don’t need to send transactions or interact directly with smart contracts.
• Use Infura if:
• You need to interact with the Ethereum blockchain in real-time.
• You’re building dApps, wallets, or tools that require transactions.
• You need to write data to the blockchain, such as sending Ether or deploying contracts.

In some cases, you might want to use both Etherscan and Infura. For example, you might use Etherscan to query transaction histories or token transfers, and Infura to send transactions or deploy contracts.

const ethers = require('ethers');

// Replace with your Infura Project ID
const infuraProvider = new ethers.JsonRpcProvider('https://mainnet.infura.io/v3/YOUR_INFURA_PROJECT_ID');

// Replace with your private key
const privateKey = 'YOUR_PRIVATE_KEY';

// Create a wallet instance and connect it to Infura
const wallet = new ethers.Wallet(privateKey, infuraProvider);

// Contract bytecode and ABI
const bytecode = '0xYourContractBytecode';
const abi = [
    // Your contract ABI here
];

async function deployContract() {
    try {
        // Create a ContractFactory to deploy the contract
        const factory = new ethers.ContractFactory(abi, bytecode, wallet);

        // Deploy the contract
        const contract = await factory.deploy();

        // Wait for the contract to be mined
        console.log('Contract deployed at address:', contract.address);
        await contract.deployTransaction.wait();
    } catch (error) {
        console.error('Error deploying contract:', error);
    }
}

// Call the function to deploy the contract
deployContract();

• Bytecode and ABI: The contract bytecode is the compiled contract, and the ABI defines the contract’s interface. You need both to deploy the contract.
• The contract will be deployed using your Infura provider and wallet, and once mined, it will return the deployed contract address.

Create a new migration file in the migrations directory:

const MyDapp = artifacts.require("MyDapp");

module.exports = function (deployer) {
  deployer.deploy(MyDapp, "Hello, world!");
};