Alert API

API reference docs for the React Alert 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 Alert from '@mui/joy/Alert';
// or
import { Alert } from '@mui/joy';

Props of the native component are also available.

Name	Type	Default	Description
color	'danger' \| 'neutral' \| 'primary' \| 'success' \| 'warning' \| string	'neutral'	The color of the component. It supports those theme colors that make sense for this component. To learn how to add your own colors, check out Themed components—Extend colors.
component	elementType		The component used for the root node. Either a string to use a HTML element or a component.
endDecorator	node		Element placed after the children.
invertedColors	bool	false	If `true`, the children with an implicit color prop invert their colors to match the component's variant and color.
role	string	'alert'	The ARIA role attribute of the element.
size	'sm' \| 'md' \| 'lg' \| string	'md'	The size of the component. To learn how to add custom sizes to the component, check out Themed components—Extend sizes.
slotProps	{ endDecorator?: func \| object, root?: func \| object, startDecorator?: func \| object }	{}	The props used for each slot inside.
slots	{ endDecorator?: elementType, root?: elementType, startDecorator?: elementType }	{}	The components used for each slot inside. See Slots API below for more details.
startDecorator	node		Element placed before the children.
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	'outlined' \| 'plain' \| 'soft' \| 'solid' \| string	'soft'	The global variant to use. To learn how to add your own variants, check out Themed components—Extend variants.

The ref is forwarded to the root element.

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

To learn how to customize the slot, check out the Overriding component structure guide.

Slot name	Class name	Default component	Description
root	.MuiAlert-root	`'div'`	The component that renders the root.
startDecorator	.MuiAlert-startDecorator	`'span'`	The component that renders the start decorator.
endDecorator	.MuiAlert-endDecorator	`'span'`	The component that renders the end decorator.

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
.MuiAlert-colorContext	colorContext	Class name applied to the root element when color inversion is triggered.
.MuiAlert-colorDanger	colorDanger	Class name applied to the root element if `color="danger"`.
.MuiAlert-colorNeutral	colorNeutral	Class name applied to the root element if `color="neutral"`.
.MuiAlert-colorPrimary	colorPrimary	Class name applied to the root element if `color="primary"`.
.MuiAlert-colorSuccess	colorSuccess	Class name applied to the root element if `color="success"`.
.MuiAlert-colorWarning	colorWarning	Class name applied to the root element if `color="warning"`.
.MuiAlert-sizeLg	sizeLg	Class name applied to the root element if `size="lg"`.
.MuiAlert-sizeMd	sizeMd	Class name applied to the root element if `size="md"`.
.MuiAlert-sizeSm	sizeSm	Class name applied to the root element if `size="sm"`.
.MuiAlert-variantOutlined	variantOutlined	Class name applied to the root element if `variant="outlined"`.
.MuiAlert-variantPlain	variantPlain	Class name applied to the root element if `variant="plain"`.
.MuiAlert-variantSoft	variantSoft	Class name applied to the root element if `variant="soft"`.
.MuiAlert-variantSolid	variantSolid	Class name applied to the root element if `variant="solid"`.

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.