get amount of certain address in nodejs with bitcoinjs-lib

electrum-client.js

/*
Usage:
  $ node electrum-client.js <servername>:<port> 3Eh99S957RnRrKmiU6DPAphwvjYB8UkeQb
  
Output:
  address:3Eh99S957RnRrKmiU6DPAphwvjYB8UkeQb amount:0.0158 btc
*/
const net = require('net')
    , bitcoin = require('bitcoinjs-lib');

const toScripthash = addr => {
  const script = bitcoin.address.toOutputScript(addr)
    , hash = bitcoin.crypto.sha256(script)
    , reversedHash = Buffer.from(hash.reverse());
  return reversedHash.toString('hex');
}

const [host, port] = process.argv[2].split(':')
    , address = process.argv[3];
const client = new net.Socket();

client.on('data', chunk => {
    const response = JSON.parse(chunk.toString())
        , address = response.id
        , amount = Number(response.result.confirmed)/100000000;
    client.destroy();
    console.log(`address:${address} amount:${amount} btc`);
})
.connect(Number(port), host, err => {
    const scripthash = toScripthash(address)
        , body = JSON.stringify({
            jsonrpc: '2.0',
            method: 'blockchain.scripthash.get_balance',
            id: address,
            params: [ scripthash ]
        });
    client.write(body +'\n');
});