This is a sandbox project where I play around with the Fitbit API. If you
want to run it, make sure you set up the NODE_ENV environment variable to
development or production, and the FITBIT_API_KEY and FITBIT_API_SECRET
to the appropriate values once you set up your application
here.
Also, make sure when you configure your Fitbit app, you point to the callback
URL https://<YOUR-WEBSITE-URL-HERE>/connect/fitbit/callback.