@middy/dynamodb middleware: Unmarshall on empty item is causing exception about middy HOT 3 CLOSED

Thanks for reporting. We use @aws-sdk/util-dynamodb internally for unmarshall. I'm surprised it doesn't support this. I would suggest opening an issue at https://github.com/aws/aws-sdk-js-v3. If you don't get a response, we have a faster unmarshall implementation inside of @middy/event-normalizer that we can swap in that does support empty/undefined values.

from middy.

thanks for your answer. I checked the code in the event-normalizer and that will solved the problem as its the sdk convertToNative function who throw an exception when data is empty.
I will open an issue for them.
In the same time in order to solve my problem quickly and before any implementation decisions is taken, i will implement my own middleware using your unmarshall method.

from middy.

I'm going to close for now, please reopen if we need to revisit this.
I am curious why you're fetching an item that is undefined and the use case around it. The original idea around this middleware was to pull a config used for all requests, in this case it would always exist.

from middy.