What is the default scripting language used for CloudFormation templates?

CloudFormation templates can be written in several formats, with JSON and YAML being the two primary options. The choice of format is flexible, allowing developers to select the one that best suits their requirements.

JSON is one of the default scripting languages for CloudFormation templates, widely recognized for its strict structure and clear syntax. Many users initially prefer JSON for its widespread use in programming and data interchange, especially in environments that heavily utilize JavaScript and REST APIs.

That said, YAML has gained popularity among developers because of its simplicity and ease of readability. However, it is important to understand that JSON is often regarded as the default when discussing compatibility and support, particularly in documentation and legacy contexts.

While XML is a format that has been used in various contexts, it is not a standard option for CloudFormation templates in recent practices. JavaScript, although relevant to AWS in some capacities, is not a language utilized for writing CloudFormation templates.

In summary, the correct answer reflects the foundational format that is entrenched in the initial design of CloudFormation, making it a fundamental part of AWS service interactions.