import json

OK = '{"ok":true}'

def ok_init(key: str) -> str:
    return json.dumps({
        "ok": True,
        "data": key,
    })

def ok_playlist(items: list[str]) -> str:
    return json.dumps({
        "ok": True,
        "data": items,
    })

def error_field(field: str) -> str:
    return json.dumps({
        "ok": False,
        "error": "field",
        "data": field,
    })