When working with ARM Templates, chances are you have set a value that was a Storage Account Connection String. For example as the value of an appsetting, or as a secret in Azure Key Vault, which I did as an example in a previous blog post. However, this does not result in the most maintainable and readable piece of JSON. Even worse if you have multiple connection strings in the same template. In this article I will show that adding a User-Defined Function to our template can improve on this.