This app included the client side with the html file in order to visualize the record player and a list of the devices for record in your laptop. After record a audio file , this file is sending to the server side also included in the file server.js.
You can modify the server address on both files.
The file index.html content the file script.js in order to active the record of the file.
Running node server.js for a dev server. Navigate to http://localhost:3000/.