# Building a JSON Response

Hoverfly Cloud uses {{handlebars syntax}} to provide template scripting with which you can build out a JSON response. Typically, this would involve relying on some data that arrives as part of the request, either as a JSON payload itself, or as part of the path, query parameter, or header.

Templating can be used to perform validation, logic, arithmetic and to generate synthetic data to be used in constructing the body of your response, amongst many other powerful capabilities.

This brief section will discuss the basics of using Hoverfly's templating to generate a JSON response.

You can read more about the other templating features [here](/create-simulations/using-templating-in-simulations.md).


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.cloud.hoverfly.io/create-simulations/building-a-json-response.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.