The app/config folder contains configuration, settings and options for your app. They are loaded into the app object and accessible from $.app.config inside of your layouts, pages, filters and actions.

Anything you need available, such as properties, data, API keys and environment variables, can be added here. The files here can be JSON, YAML or Javascript files returning objects.

For example, adding a file in app/config/env.yml with the content key: secret-key will make the secret-key value available in $.app.config.env.key in your app.