Ethers.Js Development Tutorials, Guides & Insights

• Use crypto.randomBytes when:
• You are building Node.js applications without blockchain-specific functionality.
• You want to avoid adding external dependencies.
• Use ethers.randomBytes when:
• You are developing Ethereum-related applications and already have ethers.js in your project.
• You want the flexibility of generating random bytes with minimal configuration, defaulting to 32 bytes for Ethereum addresses or private keys.

• Start and End Block: Adjust the startblock and endblock parameters to limit the range of blocks you want to query.
• Sort: Set the sort parameter to asc (ascending) or desc (descending) to control the order of the transactions.
• Token Transfers for All Tokens: You can modify the API call to query all token transfers for an address, not just a specific token contract, by omitting the contractaddress parameter.

In this tutorial, you learned how to use Ethers.js to query ERC-20 token balances and how to leverage the Etherscan API to retrieve token transaction histories. These are essential techniques for building decentralized applications, wallets, or blockchain explorers that interact with ERC-20 tokens on the Ethereum network.

If everything is set up correctly, the script will output the token balance of the specified wallet.

Token Balance: 1000000000000000000

const ethers = require('ethers');

// Replace this with your Ethereum wallet's private key or mnemonic phrase
const privateKey = 'YOUR_PRIVATE_KEY_OR_MNEMONIC';

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

// Create a wallet instance using your private key and connect it to the Infura provider
const wallet = new ethers.Wallet(privateKey, infuraProvider);

// Function to get the balance of the wallet
async function getWalletBalance() {
    // Get the wallet's balance in wei
    const balanceInWei = await wallet.getBalance();

    // Convert the balance from wei to Ether for readability
    const balanceInEther = ethers.utils.formatEther(balanceInWei);

    // Log the results
    console.log(`Wallet Address: ${wallet.address}`);
    console.log(`Wallet Balance: ${balanceInEther} ETH`);
}

// Execute the function
getWalletBalance();

If you don't want to use Infura, you can connect to a public Ethereum node:

  brew install libsodium

• Website: Libsodium