import json


def encode_if_needed(value):
    if isinstance(value, str):
        value = value.encode('utf-8')
    return value


def decode_if_needed(value):
    if isinstance(value, (bytes, bytearray)):
        value = value.decode('utf-8')
    return value


def serialize_all(key, data):
    return [encode_if_needed(frame) for frame in (key, json.dumps(data))]


def deserialize_all(key, data):
    return decode_if_needed(key), json.loads(data)