DynamoDBStreams->Lambda->DocumentClient.js

var AWS = require("aws-sdk");

var docClient =  new AWS.DynamoDB.DocumentClient()

//Create a Translator object, which comes from the DocumentClient
var dynamodbTranslator = docClient.getTranslator();

//It needs a SDK 'shape'. The individual Items in the Stream record
//are themselves the same Item shape as we see in a getItem response
var ItemShape = docClient.service.api.operations.getItem.output.members.Item;

module.exports.handler = function(event, context, callback) {
    event.Records.forEach(function(record) {
        //Let's just replace, in-place each Item with a 'translated' version
        record.dynamodb.OldImage = dynamodbTranslator.translateOutput(record.dynamodb.OldImage, ItemShape);
        record.dynamodb.NewImage  = dynamodbTranslator.translateOutput(record.dynamodb.NewImage, ItemShape);
        //Do Stuff With Your New Sane Record
    });

}