AWS CloudFormation
User Guide (API Version 2010-05-15)
AWS Documentation » AWS CloudFormation » User Guide » Template Reference » Pseudo Parameters Reference
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Pseudo Parameters Reference

Pseudo Parameters are parameters that are predefined by AWS CloudFormation. You do not declare them in your template. Use them the same way as you would a parameter, as the argument for the Ref function.

For example, the following fragment assigns the value of the AWS::Region pseudo parameter:

"Outputs" {
   "MyStacksRegion" : { "Value" : { "Ref" : "AWS::Region" } }
}

The currently available pseudo parameters are listed here.

AWS::NotificationARNs

Returns the list of notification Amazon Resource Names (ARNs) for the current stack.

For example:

{
   "AWSTemplateFormatVersion" : "2010-09-09",
   "Resources" : {
      "MyEmbeddedStack" : {
         "Type" : "AWS::CloudFormation::Stack",
         "Properties" : {
            "TemplateURL" : "https://my-website.com/stack-spec.json",
            "NotificationARNs" : {"Ref" : "AWS::NotificationARNs"}
         }
      }
   }
}

To get a single ARN from the list, use Fn::Select:

"myASGrpOne" : {
   "Type" : "AWS::AutoScaling::AutoScalingGroup",
   "Version" : "2009-05-15",
   "Properties" : {
      "AvailabilityZones" : [ "us-east-1a" ],
      "LaunchConfigurationName" : { "Ref" : "MyLaunchConfiguration" },
      "MinSize" : "0",
      "MaxSize" : "0",
      "NotificationConfiguration" : {
         "TopicARN" : { "Fn::Select" : [ "0", { "Ref" : "AWS::NotificationARNs" } ] },
         "NotificationTypes" : [ "autoscaling:EC2_INSTANCE_LAUNCH", "autoscaling:EC2_INSTANCE_LAUNCH_ERROR" ]
      }
   }
}
AWS::Region

Returns a string representing the AWS Region in which the encompassing resource is being created.

AWS::StackId

Returns the ID of the stack as specified with the cfn-create-stack command.

AWS::StackName

Returns the name of the stack as specified with the cfn-create-stack command.

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