> For the complete documentation index, see [llms.txt](https://docs.acho.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.acho.io/app-builder/app-construction/elements/form-check.md).

# Form Check

Form elements have a Form Check section to validate user inputs.

By default, it comes with a validator for required fields. By toggling Required, you can require the user to enter an input. If no input is entered, the error prompt will be shown.

![](/files/7Ov7Hmexqapq8kf9v2j2)

You can also add validators, such as checking if the input is an email.

![](/files/LfHOI3HTNPxsKQJjklvf)

Select the check type. When Check Value is toggled on, the validator will be on. Type in what text to display when there's an error into Error prompt.