Check if object is empty before running app.listen

const express = require('express') const fs = require('fs') const parse = require('csv-parse/lib/sync') const app = express() const port = 3000 const input = ` "key_1","key_2" "value 1","value 2" ` fs.writeFileSync('sample.csv', input, 'utf8', console.log('Wrote file')); var myMap = fs.readFileSync('sample.csv', 'utf8'); /* this will return: / [Object {key_1: "value 1", key_2: "value 2"}] */ const records = parse(myMap, { columns: true, skip_empty_lines: true }) app.get('/', (req, res) => res.send('Hello World!' + records[0].key_1)) app.listen(port, () => console.log(`Example app listening on port ${port}!`))