Enable dynamodb stream for an existing dynamodb table

Hi, For this you can simply add the StreamSpecification parameter to your table and update the stack:

"StreamSpecification": {
          "StreamViewType": "NEW_AND_OLD_IMAGES"
        }

A sample table with Stream included:

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Resources": {
    "myDynamoDBTable": {
      "Type": "AWS::DynamoDB::Table",
      "Properties": {
        "AttributeDefinitions": [
          {
            "AttributeName": "id",
            "AttributeType": "S"
          }, 
          {
            "AttributeName": "name",
            "AttributeType": "S"
          }
        ],
        "KeySchema": [
          {
            "AttributeName": "id",
            "KeyType": "HASH"
          }
        ],
        "BillingMode": "PAY_PER_REQUEST",
        "TableName": "testcfn",
        "StreamSpecification": {
          "StreamViewType": "NEW_AND_OLD_IMAGES"
        }
      }
    }
  }
}