Get ETH Balance

eth-balance.js

const Web3 = require('web3');
const testnet = 'https://rinkeby.infura.io/';
const walletAddress = '0xcde7bd7943944dc558a427ef061400a4da9ee822';

void async function() {
  try {
    const web3 = new Web3(new Web3.providers.HttpProvider(testnet));
    const balance = await web3.eth.getBalance(walletAddress);
    console.log('the balance is', web3.utils.fromWei(balance, 'ether'))
  } catch (error) {
    console.error(error)
  }
}();