Example of wrtieStream I am trying on Nodjitsu

gistfile1.js

                var oldName = req["headers"]["x-file-name"],
		    tmpPath= path.join(__dirname, '../temp/' + oldName),
		    ws = fs.createWriteStream(tmpPath),

		req.pipe(ws);
		req.on('error', function(err) {
			console.log(err);
		});
		req.on('end', function() {
			fs.readFile(tmpPath + '/' + oldName, function(err, doc) {
				if(err) console.log('Error: ', err);
				console.log(doc);
				fs.unlink(tmpPath + '/' + oldName);
			})
	        }