CompressFile.js

const fs = require('fs');
const zlib = require('zlib');

// Read in a file
const pFile = fs.readFileSync(`${__dirname}/bigFile`);

// Log the byte size
console.log('Original Size:', Buffer.byteLength(pFile, 'utf8'));

// Compress it
const deflated = zlib.deflateSync(pFile).toString('base64');

// Log the byte size
console.log('Deflated Size:', Buffer.byteLength(deflated, 'utf8'));

// Write out that file
fs.writeFile(`${__dirname}/bigFileCompressed`, deflated, function(err, data) {
  if (err) {
    return console.log(err);
  }
});

// Uncompress it
const inflated = zlib.inflateSync(Buffer.from(deflated, 'base64')).toString();

// Log the byte size
console.log('Inflated Size:', Buffer.byteLength(inflated, 'utf8'));

// Write out a new file
fs.writeFile(`${__dirname}/bigFileDecompressed`, inflated, function(err, data) {
  if (err) {
    return console.log(err);
  }
});