Example with ethers.js (Ethereum Wallet)

wallet.js

const ethers = require('ethers')

const standardPath = "m/44'/60'/0'/0";
const activeIndex = 0;

function generatePath(index) {
  const path = `${standardPath}/${index}`;
  return path;
}

function generateMnemonic() {
  const entropy = ethers.utils.randomBytes(16);
  const mnemonic = ethers.utils.entropyToMnemonic(entropy);
  return mnemonic;
}


function createWallet() {
  const mnemonic = generateMnemonic();
  const path = generatePath(activeIndex);
  const account = ethers.Wallet.fromMnemonic(mnemonic, path);

  return account;
}

function createWallets(numWallets) {
  const accounts = [];
  const mnemonic = generateMnemonic();

  for (let i = activeIndex; i < numWallets; i++) {
    const path = generatePath(i);
    accounts.push(ethers.Wallet.fromMnemonic(mnemonic, path));
  }

  return accounts;
}