How to convert byte array to image in Node.js?

Question

How to convert byte array to image in Node.js? I tried the code below. It creates an image, but when I open it, an error message appears

Error interpreting JPEG image file.

I converted the byte array from the bitmap to Android and sent it to the Node server.

var mkdirp = require('mkdirp');

var fs = require('fs');

var bitmap = new Buffer(bytearray,'base64');

mkdirp(__dirname + "/images/",function(er)
{

  if(er) console.log(er);

  fs.writeFileSync(__dirname + "/images/"+profile._id+".jpeg",bitmap);

});