This appendix covers
If you use S3 with Lambda, you need to understand the S3 event message structure for the purpose of extracting needed information from the message. This appendix describes the structure of the event message, so that you’re aware of the available properties and their expected values.
The following listing shows an example S3 event message after an object has been added to a bucket. This example is adapted from https://docs.aws.amazon.com/AmazonS3/latest/dev/notification-content-structure.html.