files

files is simply an object in which each key/field specifies a name and the corresponding value specifies the (relative) path of the file that name refers to.

An example to make this clearer.

Apps are expected to define a file called icon. (Another expected file is index.)

{
    "bolt": {
        "files": {
            "icon": "assets/img/icon.png",
            "index": "views/home.html"
        }
    }
}

To get the icon for the app now becomes as simple as (assuming Bolt is running on port 400) localhost:400/files/your-app-name/icon. This will fetch the appropriate public file, in this case localhost:400/public/your-app-name/assets/img/icon.png.

A Little Tip for You

Note that all files exposed by the app must be public files.