# Hidden Field

The hidden field answer type is a field that can hold a value but that is not displayed to the respondent. You may use the hidden field to store extra information along the respondent that you don't want the respondent to see or to enter manually.

{% hint style="info" %}
You may check out how our [walkthrough](/walkthroughs/capture-value-from-querystring.md) on how to use a hidden field to capture values from a query string.
{% endhint %}


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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.ngsurvey.com/form-management/form-designer/answers/answer-types/hidden-field.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.