getImages.js

var http = require('http'),
	fileJSON = require('./images.json'),
	fs = require('node-fs'),
	options,
	assets = fileJSON.imageArr;

options = {
	host: 'url.com',
	port: 80,
	path: 'path/to/images'
};

// download and save file
function getAndWrite(imageUrl) {

	var request = http.get({ host: options.host, port: options.port, path: options.path + imageUrl }, function(res) {

		var imagedata = ''; // image returns in chunks
		res.setEncoding('binary');

		// assemple image chunks
		res.on('data', function(chunk){
			imagedata += chunk;
		});

		// create directory and write file (node-fs, not fs)
		res.on('end', function(){
			
			dir = imageUrl.split('/');
			dir.pop();
			dir = dir.join('/');

			// make dir
			fs.mkdir('./image/' + dir, 0777, true, function (err) {
				if (err) {
					console.log(err);
				} else {
					// write file
					fs.writeFile('image' + imageUrl, imagedata, 'binary', function(err){
						if (err) throw err;
					});
				}
			});


		});

	});

}

// Loop through images to download
for(var i = 0;i<assets.length;i++) {
	getAndWrite(assets[i]);
}