File , user info and zip and Unzip program

Module_3.js

'use strict';
var fs = require('fs');
const https = require('https');  
const util = require('util');  
const zlib = require('zlib');
const os = require('os');

//question 1
var fileName = 'assign3.js';  
var readStream = fs.createReadStream(fileName);
readStream
    .on('data', function (chunk) {
        console.log('File name: ', fileName);
        console.log('File size:', chunk.length);
    })
    .on('end', function () {
        console.log('Done');
    });
    
// question 2
var NI = os.networkInterfaces();
console.log(`IP address : ${NI.en0[1].address}`);
console.log(`Subnet MAsk : ${NI.en0[1].netmask}`);
console.log(os.userInfo());


//question 3
const input = 'Saurabh';
zlib.deflate(input, (err, buffer) => {
  if (!err) {
    console.log(buffer.toString('base64'));
  } 
});

const buffer = Buffer.from('eJwLTiwtSkzKAAAK8gLH', 'base64');
zlib.unzip(buffer, (err, buffer) => {
  if (!err) {
    console.log(buffer.toString());
  } else {
	console.log(err);
  }
});

//question  4
const gzip = zlib.createGzip();
const inp = fs.createReadStream('assign3.js');
const out = fs.createWriteStream('assign3.zip');
inp.pipe(gzip).pipe(out);