getIt.js

var fs = require('fs');

// function to encode file data to base64 encoded string
function base64_encode(file) {
    // read binary data
    var bitmap = fs.readFileSync(file);
    // convert binary data to base64 encoded string
    return new Buffer(bitmap).toString('base64');
}

// function to create file from base64 encoded string
function base64_decode(base64str, file) {
    // create buffer object from base64 encoded string, it is important to tell the constructor that the string is base64 encoded
    var bitmap = new Buffer(base64str, 'base64');
    // write buffer to file
    fs.writeFileSync(file, bitmap);
    console.log('******** File created from base64 encoded string ********');
}

// convert image to base64 encoded string
//var base64str = base64_encode('kitten.jpg');
//console.log(base64str);
// convert base64 string back to image 

var bitmap = fs.readFileSync('node-v6.7.0-x64.b64');
// convert binary data to base64 encoded string
var base64str = new Buffer(bitmap).toString();
base64_decode(base64str, 'node-v6.7.0-x64.msi');