Maybe the question does not apply to dynamoDB due to it not being Relational Db.
However, I\'m looking for a good object mapper which can be used in nodejs and aws sdk to map e
Have you seen dynasaur? It seems to be the type of thing you're looking for, but I have not used it myself. There's also dynamodb-data-types which is not an ORM, but makes it easy to convert to/from standard JavaScript objects.