Getting last price from cexio

cexio.js

const app = require('express')();
const server = require('http').Server(app);
const request = require('request');
const Websocket = require('ws');


function getPairs(){
  return new Promise((resolve, reject)=>{
      request('https://cex.io/api/currency_limits', function(error, res, body){
        if (res.statusCode == 200 && !error){
          var pairs = []
          var result = JSON.parse(body).data.pairs
          //console.log(result[0].symbol1);
          var i;

          for(i=0; i<result.length; i++){
              pairs.push("pair-"+result[i].symbol1+"-"+result[i].symbol2)
          }
          resolve(pairs)
        }

      });
  });

}


async function queryMaker(){
  var pairs = await getPairs()
  var sub_dict = {'e': 'subscribe','rooms':["tickers"]}
  sub_dict['rooms'].push.apply(sub_dict['rooms'], pairs)

  const URL = "wss://ws.cex.io/ws"
  const ws = new Websocket(URL);

  ws.on('open', function open(){
      ws.send(JSON.stringify(sub_dict))
  });

  ws.on('message', function incoming(data){
    var result = JSON.parse(data);

    if ('tick' == (result.e)){
      var price = result.data.price
      var pair = result.data.symbol1 + result.data.symbol2
      console.log('price_data', {pair, price});
    }
  });


}

server.listen(3005);

app.get('/', function (req, res, err) {
   res.sendFile('/index.html',{"root":__dirname});

  if (err) {
    console.log(err)
  }
});


queryMaker()