>>> import requests
>>> from jsonfeedvalidator import validate_feed, format_errors, ErrorTree
>>> resp = requests.get("https://daringfireball.net/feeds/json")
>>> validate_feed(resp.json())
[]
>>> feed = {"items": [{"attachments": [{}]}]}
>>> errors = validate_feed(feed)
>>> format_errors(feed, ErrorTree(errors))
{
    'items': {
        0: {
            'errors': {
                'required': [
                    "'id' is a required property"
                ]
            },
            'attachments': {
                0: {
                    'errors': {
                        'required': [
                            "'mime_type' is a required property",
                            "'url' is a required property"
                        ]
                    }
                }
            }
        }
    },
    'errors': {
        'required': [
            "'title' is a required property",
            "'version' is a required property"
        ]
    }
}