CloudFormation template format version syntax - Amazon CloudFormation
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CloudFormation template format version syntax

The AWSTemplateFormatVersion section (optional) identifies the template format version that the template conforms to. The latest template format version is 2010-09-09 and is currently the only valid value.

The template format version isn't the same as the API version. The template format version can change independently of the API versions.

The value for the template format version declaration must be a literal string. You can't use a parameter or function to specify the template format version. If you don't specify a value, CloudFormation assumes the latest template format version. The following snippet is an example of a valid template format version declaration:

JSON

"AWSTemplateFormatVersion" : "2010-09-09"

YAML

AWSTemplateFormatVersion: 2010-09-09