Large JSON / Object test (in stupid way)

index.js

"use strict";

Promise = require("bluebird");
var fs = require("fs");

var moment = require("moment");

var sample = [];
var start, duration;

// const ROWS = 2 * 1000 * 1000; // RangeError: Invalid string length
const ROWS = 1 * 1000 * 1000;

function beginCount() {
  start = moment();
}

function endCount(desc) {
  duration = moment.duration(moment().diff(start));
  console.log(desc, ":", duration.asMilliseconds());
}

function benchmark_a() {
  return new Promise((resolve, reject) => {
    try {
      beginCount();
      for (let i = 0; i <= ROWS; i++) {
        sample.push({
          "ACCOUNT_NUMBER":"1234567890",
          "CUSTOMER_NAME":"ACME Products and Services, Inc.",
          "ADDRESS":"123 Main Street",
          "CITY":"Albuquerque",
          "STATE":"NM",
          "ZIP":"87101-1234"
        });
      }
      endCount("filling");

      beginCount();
      let data = JSON.stringify(sample);
      endCount("stringify");

      beginCount();
      fs.writeFile(__dirname + "/sample.json", data, (err) => {
        if (!err) {
          endCount("writing");
          
          resolve();
        } else {
          reject(err);
        }
      });
    } catch (err) {
      reject(err);
    }
  });
}

function benchmark_b() {
  return new Promise((resolve, reject) => {
    try {
      beginCount();
      fs.readFile(__dirname + "/sample.json", (err, data) => {
        if (!err) {
          endCount("reading");
  
          beginCount();
          sample = JSON.parse(data);
          endCount("parse");
          
          resolve();
        } else {
          reject(err);
        }
      });
    } catch (err) {
      reject(err);
    }
  });
}

Promise.all([])
.then(benchmark_a)
.then(benchmark_b)
.then(() => { console.log("done"); })
.catch((err) => { console.error(err); });

Preparation

mkdir test && cd test
touch index.js
npm init
npm install --save bluebird moment