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aws.DynamoDB.Converter.output({ 'M': record.dynamodb.NewImage })AWS.DynamoDB.Converter.outputis the part of the DocumentClient that translates DynamoDB AttributeValue objects to JSON-style objects. I assumed theMwas part of the data you got in the stream event.marshallfunction that doesn't require theMkey, and it was included in version 2.71.0 of the SDK.