> For the complete documentation index, see [llms.txt](https://help.form.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.form.io/how/examples.md).

# Examples

## Overview

This page is a repository of minimal example implementations that have been created. You can import these templates and see how a given feature was implemented in the builder.

These get created during support emails. If you need an example created for your situation, please send us an email

### Input must be valid json

#### Description

Textarea w/ custom validation attached to verify the contents is valid json.

{% file src="/files/fMk89592K0sxy4Txeow5" %}

### Set the value of one field using another

#### Description

When the button is clicked on this form, the value from the source field will be copied to the destination.

{% file src="/files/IsrYKd8EBCxrzfI2sNQP" %}

### Validate dates relative to other dates

3 date inputs w/ attached validation: min, max, in between

{% file src="/files/0oNgY50YRxdPbYpjxrsh" %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

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

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://help.form.io/how/examples.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

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.