AWS DynamoDB returns validation error when called from AWS Lambda

Question

I'm using AWS Lambda and try to write something to AWS DynamoDB. I use the following code:

var tableName = "locations";
var item = {
    deviceId: {
        S: event.deviceId
    },
    timestamps: {
        S: event.timestamp 
    }
}
var params = {
    TableName: tableName,
    Item: item
};

dynamo.putItem(params, function(err, data) {
    if (err) {
        context.fail(new Error('Error ' + err));
    } else {
        context.success(null);
    }
});

And I get the following error:

returns Error ValidationException: One or more parameter values were invalid: Type mismatch for key deviceId expected: S actual: M

Martin Kretz · Accepted Answer · 2015-09-08 07:11:26Z

34

This happened because the aws sdk for Nodejs had changed!

If you are using:

var doc = require('dynamodb-doc');
var dynamo = new doc.DynamoDB();

Then the parameters to the putItem call (and most other calls) have changed and instead needs to be:

var tableName = "locations";
var item = {
    deviceId: event.deviceId,
    timestamp: event.timestamp,
    latitude: Number(event.latitude),
    longitude: Number(event.longitude)
}
var params = {
    TableName: tableName,
    Item: item
};

Read all about the new sdk here: https://github.com/awslabs/dynamodb-document-js-sdk

answered Sep 8, 2015 at 7:11

Martin Kretz

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3 Comments

Raymond Lin Over a year ago

The AWS-SDK now actually supports a DocumentClient! Check it out here docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/…

mercedes Over a year ago

This fixed it. Thank you! AWS needs to update their documentation.

Eric Seastrand Over a year ago

AWS boilerplate still has this issue as of 2018 :(

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