A basic CSV reader in node. Doesn't account for things like commas in row or header values.

csv-parser.js

const fs = require('fs');
const { once } = require('events');
const readline = require('readline');

const zip = (keys, vals) =>
  keys.reduce((currentObj, prop, idx) => {
    currentObj[prop] = vals[idx];
    return currentObj;
  }, {});

const parseCSV = async (csvFile) => {
  let i = 0;
  let cols = [];
  let rows = [];
  let data = [];
  const stream = fs.createReadStream(csvFile, { encoding: 'utf-8' })
  const readInterface = readline.createInterface({
    input: stream,
    output: process.stdout,
    terminal: false
  });
  readInterface.on('line', (line) => {
    i++;
    let row;
    if (i === 1) {
      cols = line.split(',');
    } else {
      row = line.split(',');
      rows.push(row);
    }
  });
  await once(readInterface, 'close');
  data = rows.map(row => zip(cols, row));
  return data;
}