Ethers.Js Development Tutorials, Guides & Insights

• crypto.randomBytes:
• Library: crypto.randomBytes is part of Node.js’s built-in crypto module. It requires no additional dependencies and is readily available in any Node.js environment.
• Usage: The function takes a single argument specifying the number of bytes to generate and returns a Buffer object containing the random bytes.
• Example:

    const crypto = require('crypto');
    const randomBytes = crypto.randomBytes(32);
    console.log(randomBytes.toString('hex')); // Prints a 32-byte random hex string

const axios = require('axios');

// Replace with your Etherscan API key
const apiKey = 'YOUR_ETHERSCAN_API_KEY';

// Replace with the wallet address you want to query
const address = '0xYourEthereumAddress';

// Replace with the ERC-20 token contract address
const contractAddress = '0xTokenContractAddress';

// Etherscan API URL to fetch ERC-20 token transactions
const url = `https://api.etherscan.io/api?module=account&action=tokentx&contractaddress=${contractAddress}&address=${address}&startblock=0&endblock=99999999&sort=asc&apikey=${apiKey}`;

async function getTokenTransactions() {
    try {
        // Make the API request to Etherscan
        const response = await axios.get(url);
        const transactions = response.data.result;

        // Log the token transactions
        transactions.forEach(tx => {
            console.log(`
                From: ${tx.from}
                To: ${tx.to}
                Value: ${ethers.utils.formatUnits(tx.value, 18)} Tokens
                Transaction Hash: ${tx.hash}
            `);
        });
    } catch (error) {
        console.error('Error fetching token transactions:', error);
    }
}

// Call the function to get the token transactions
getTokenTransactions();

• API Key: Replace 'YOUR_ETHERSCAN_API_KEY' with the API key you generated from Etherscan.
• Wallet Address: Replace '0xYourEthereumAddress' with the wallet address you want to query for token transactions.
• Token Contract Address: Replace '0xTokenContractAddress' with the contract address of the ERC-20 token you want to track.

Example output:

Transaction sent: 0xTransactionHash
Transaction confirmed: { transaction details }

Run the following command in your project folder to install it:

npm install ethers

• Description: A modern, portable, easy-to-use cryptographic library that provides secure and fast cryptographic functions.
• Use Cases:
• Implement secure cryptographic operations in blockchain applications.
• Encrypt, sign, and verify messages and transactions.
• Perform secure random number generation and key derivation.
• Key Features:
• Comprehensive support for cryptographic algorithms.
• Portable and optimized for performance.
• Extensive documentation and active development.
• Installation:

  brew install libsodium