The purpose of this app is to upload and download the file of any extension. You don't need to worry about file extension, is going to work for all types of file.
Run the following command in root directory of an app in command prompt.
server/ npm install
Run the following command in root directory of an app in command prompt.
server/ node server.js
You can see the port number in command prompt after sucessfull run
[Express-file-upload-download] (https://github.com/Cron-J/Express-file-upload-download)