Graphs audio features for individual tracks, playlists, and a user's entire Spotify library. A data set containing all the songs in a users library can be viewed.
mkdir ...main/node_modules && cd $_ && npm install express && npm install request npm install querystring
Set the following variables with your credentials from Spotify Developer
//main/authorization_code/app.js
var client_id = ''; // Your client id
var client_secret = ''; // Your secret
var redirect_uri = 'http://localhost:8888/callback'; // Your redirect uri (default to local host)
Set the redirect URI for your application on the Spotify Developer website
cd ../main/authorization_code && node app.js
Navigate to your site (ex. http://localhost:8888/), and login...