Spotify Data Visualizer (Backend)

Express server on Node runtime to faciliate requests from the Spotify data visualizer client: top-spotify-web

• Establishes a socket connection to client via socket.io and session for seamless OAuth2 transactions
• Fetches artist location data from a private server hosting a custom MusicBrainz pg database: mb-server
• Encapsulated authentication via passport
• Route code separated from server code
• Security middleware: cors, helmet
• Polls Spotify's API asynchronously
• ES6 syntax; airbnb code style