Electrum client get balance in Node.js

electrum_get_balance.js

const ElectrumClient = require('electrum-client')
const peers = require('electrum-host-parse').getDefaultPeers('BitcoinSegwit').filter(v => v.ssl)
const getRandomPeer = () => peers[peers.length * Math.random() | 0]

let mainClient = false

const main = async () => {
  const peer = getRandomPeer()
  console.log('begin connection:', JSON.stringify(peer))
  mainClient = new ElectrumClient(peer.ssl, peer.host, 'ssl')
  try {
    await mainClient.connect()
    const ver = await mainClient.server_version('2.7.11', '1.0')
    console.log('connected to ', ver)
  } catch (e) {
    console.log('bad connection:', JSON.stringify(peer))
    console.log('trying again')
    return main()
  }
}

async function getBalance(address) {
  await main()
  let balance = await mainClient.blockchainAddress_getBalance(address)
  return balance.confirmed
}

module.exports = {
  getBalance
}