{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "anyOf": [
        {
            "additionalProperties": false,
            "properties": {
                "songs": {
                    "items": {
                        "additionalProperties": false,
                        "properties": {
                            "artist": {
                                "type": "string"
                            },
                            "title": {
                                "type": "string"
                            }
                        },
                        "required": [
                            "artist",
                            "title"
                        ],
                        "type": "object"
                    },
                    "type": "array"
                },
                "type": {
                    "const": "success",
                    "type": "string"
                }
            },
            "required": [
                "songs",
                "type"
            ],
            "type": "object"
        },
        {
            "additionalProperties": false,
            "properties": {
                "error": {
                    "type": "string"
                },
                "type": {
                    "const": "error",
                    "type": "string"
                }
            },
            "required": [
                "error",
                "type"
            ],
            "type": "object"
        }
    ]
}