What is the recommended way to remove data type descriptors from a DynamoDB response?

Question

DynamoDB includes a data type descriptor for each element in query response, as shown below:

"Item": { 
    "M" : {
        "Age": {"N": "8"},
        "Name": {"S": "Fido"},
        "Vaccinations": {
            "M": {
                "Rabies": {
                    "L": [
                        {"S": "2009-03-17"},
                        {"S": "2011-09-21"},
                        {"S": "2014-07-08"}
                    ]
                },
                "Distemper": {"S": "2015-10-13"}
            }
        }
    }
}

I would like to strip all of these descriptors ("S", "L", "M", etc), so that it looks like the next example, before I JSON.stringify the data.

"Item": {
    "Age": "8",
    "Name": "Fido",
    "Vaccinations": {
        "Rabies": [
            "2009-03-17",
            "2011-09-21",
            "2014-07-08"
         ]
         "Distemper": "2015-10-13"
     }
}

Is there are standard (or recommended) method for doing this?

Answer 1

They have a converter that you can use.

For instance, here is their example:

var data= {"Item": {
    "Age": {"N": "8"},
    "Name": {"S": "Fido"},
    "Vaccinations": {
        "M": {
            "Rabies": {
                "L": [
                    {"S": "2009-03-17"},
                    {"S": "2011-09-21"},
                    {"S": "2014-07-08"}
                ]
            },
            "Distemper": {"S": "2015-10-13"}
        }
}}};
var marshalled = AWS.DynamoDB.Converter.unmarshall(data);

https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/Converter.html

Answer 2

With sdk version 3 there are a marshall and unmarshall utilities

https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/modules/_aws_sdk_util_dynamodb.html

import { marshall, unmarshall } from '@aws-sdk/util-dynamodb';

try {
  const data = await ddbClient.send(new GetItemCommand(configReadService.params));
  return unmarshall(data.Item) as unknown as ConfigAssets;
} catch (e) {
  console.log('Reading the configuration database failed ', e)
}