I get this error message in `Python/Django`: `bytearray(b'') is not JSON serializable`. Currently, I do it like this:

```
...
from django.core.serializers.json import DjangoJSONEncoder
...

output = json.dumps(data, cls=DjangoJSONEncoder)
return HttpResponse(output)

```

I import `DjangoJSONEncoder`, because before that I had problem with `datetime`. That problem went away, but now I have another problem with type `bytearray`. So, I'm interested to know, if there is a standard and universal way of creating json string, no matter what data types you use.