FormHelperText API

API reference docs for the React FormHelperText component. Learn about the props, CSS, and other APIs of this exported module.

Component demos

For examples and details on the usage of this React component, visit the component demo pages:

import FormHelperText from '@mui/material/FormHelperText';
// or
import { FormHelperText } from '@mui/material';

Props of the native component are also available.

Name	Type	Description
children	node	The content of the component. If `' '` is provided, the component reserves one line height for displaying a future message.
classes	object	Override or extend the styles applied to the component. See CSS API below for more details.
component	elementType	The component used for the root node. Either a string to use a HTML element or a component.
disabled	bool	If `true`, the helper text should be displayed in a disabled state.
error	bool	If `true`, helper text should be displayed in an error state.
filled	bool	If `true`, the helper text should use filled classes key.
focused	bool	If `true`, the helper text should use focused classes key.
margin	'dense'	If `dense`, will adjust vertical spacing. This is normally obtained via context from FormControl.
required	bool	If `true`, the helper text should use required classes key.
sx	Array<func \| object \| bool> \| func \| object	The system prop that allows defining system overrides as well as additional CSS styles. See the `sx` page for more details.
variant	'filled' \| 'outlined' \| 'standard' \| string	The variant to use.

The ref is forwarded to the root element.

You can use MuiFormHelperText to change the default props of this component with the theme.

These class names are useful for styling with CSS. They are applied to the component's slots when specific states are triggered.

Class name	Rule name	Description
.Mui-disabled		State class applied to the root element if `disabled={true}`.
.Mui-error		State class applied to the root element if `error={true}`.
.Mui-focused		State class applied to the root element if `focused={true}`.
.Mui-required		State class applied to the root element if `required={true}`.
.MuiFormHelperText-contained	contained	Styles applied to the root element if `variant="filled"` or `variant="outlined"`.
.MuiFormHelperText-filled	filled	State class applied to the root element if `filled={true}`.
.MuiFormHelperText-root	root	Styles applied to the root element.
.MuiFormHelperText-sizeSmall	sizeSmall	Styles applied to the root element if `size="small"`.

You can override the style of the component using one of these customization options:

With a global class name.
With a rule name as part of the component's styleOverrides property in a custom theme.