DynamoDB putItem Validation Error: Supplied AttributeValue is empty, must contain exactly one of the supported datatypes

Here is my code:

    obj = _.chain(obj)
    .values()
    .map(function(item) {
        return item ? item.toString() : "";
    })
    .value();

    DynamoDB.putItem({
        "TableName": tblName,
        "Item": {
            "UserId": { "S": obj.user_id },
            "Identifier": { "S": obj.identifier },
            "ReferralToken": { "S": obj.referral_token },
            "CampaignId": { "S": obj.campaign_id },
            "FirstName": { "S": obj.first_name },
            "LastName": { "S": obj.last_name },
            "Gender": { "S": obj.gender },
            "BirthDate": { "S": obj.birthdate },
            "Username": { "S": obj.username },
            "MobileNumber": { "S": obj.mobile_number },
            "PostalCodeText": { "S": obj.postal_code_text },
            "Classification": { "S": obj.classification },
            "DeliveryEmail": { "S": obj.delivery_email },
            "DeliverySMS": { "S": obj.delivery_sms }
        }
    }, function (err, data) {
        console.log(err);
        console.log(data);
    });

The error I keep getting is:

{ [ValidationException: Supplied AttributeValue is empty, must contain exactly one of the supported datatypes]
  message: 'Supplied AttributeValue is empty, must contain exactly one of the supported datatypes',
  code: 'ValidationException',
  time: Fri Oct 10 2014 11:04:00 GMT-0500 (CDT),
  statusCode: 400,
  retryable: false }

I am sure I am doing something obviously wrong, I just can’t seem to figure out what’s wrong

Issue Analytics

State:
Created 9 years ago
Comments:7 (3 by maintainers)

Top GitHub Comments

7reactions

lsegalcommented, Oct 10, 2014

@dennismonsewicz the DynamoDB API does not allow empty strings for items, see here (search for “empty string”). Your code that replaces items with “” is likely what is causing the error.

If you really want to store those empty objects, you might consider using the new NULL type in DynamoDB just released this week, though that would require passing (and parsing) { NULL: true } instead of { S: ... }. You might also want to look at awslabs/dynamodb-document-js-sdk which supports converting null values in a more transparent way using the new NULL types.

4reactions

dennismonsewiczcommented, Oct 11, 2014

Thanks so much for the help! I think I figured out my issue.

It appears even if you label an item as an N type, you have to convert it the item to a string. So your object mapping would look like…

{ "N": "1234" }

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