AWS Cloudformation- How to do string Uppercase or lowercase in json/yaml template

Question

I am working on AWS CloudFormation and I created one template in which I asked user to select Environment.

On the basis of selected value I created the resources.

Answer 1

You can do this with a CloudFormation macro.

Parameters:
  InputString:
    Default: "This is a test input string"
    Type: String
Resources:
  S3Bucket:
    Type: "AWS::S3::Bucket"
    Properties:
      Tags:
        - Key: Upper
          Value:
            'Fn::Transform':
             - Name: 'String'
               Parameters:
                 InputString: !Ref InputString
                 Operation: Upper

https://github.com/awslabs/aws-cloudformation-templates/tree/master/aws/services/CloudFormation/MacrosExamples/StringFunctions