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Addon API

Storybook's API allows developers to interact programmatically with Storybook. With the API, developers can build and deploy custom addons and other tools that enhance Storybook's functionality.

Core Addon API

Our API is exposed via two distinct packages, each one with a different purpose:

  • @storybook/manager-api used to interact with the Storybook manager UI or access the Storybook API.
  • @storybook/preview-api used to control and configure the addon's behavior.

<CodeSnippets paths={[ 'common/storybook-addons-api-imports.js.mdx', ]} />

addons.add()

The add method allows you to register the type of UI component associated with the addon (e.g., panels, toolbars, tabs). For a minimum viable Storybook addon, you should provide the following arguments:

  • type: The type of UI component to register.
  • title: The title to feature in the Addon Panel.
  • render: The function that renders the addon's UI component.

<CodeSnippets paths={[ 'common/storybook-addon-panel-initial.js.mdx', ]} />

The render function is called with active. The active value will be true when the panel is focused on the UI.

addons.register()

Serves as the entry point for all addons. It allows you to register an addon and access the Storybook API. For example:

<CodeSnippets paths={[ 'common/storybook-addons-api-register.js.mdx', ]} />

Now you'll get an instance to our StorybookAPI. See the api docs for Storybook API regarding using that.

addons.getChannel()

Get an instance to the channel to communicate with the manager and the preview. You can find this in both the addon register code and your addon’s wrapper component (where used inside a story).

It has a NodeJS EventEmitter compatible API. So, you can use it to emit events and listen to events.

<CodeSnippets paths={[ 'common/storybook-addons-api-getchannel.js.mdx', ]} />

makeDecorator

Use the makeDecorator API to create decorators in the style of the official addons. Like so:

<CodeSnippets paths={[ 'common/storybook-addons-api-makedecorator.js.mdx', ]} />

If the story's parameters include { exampleParameter: { disable: true } } (where exampleParameter is the parameterName of your addon), your decorator will not be called.

The makeDecorator API requires the following arguments:

  • name: Unique name to identify the custom addon decorator.
  • parameterName: Sets a unique parameter to be consumed by the addon.
  • skipIfNoParametersOrOptions: (Optional) Doesn't run the decorator if the user hasn't options either via decorators or parameters.
  • wrapper: your decorator function. Takes the getStory, context, and both the options and parameters (as defined in skipIfNoParametersOrOptions above).

Storybook API

Storybook's API allows you to access different functionalities of Storybook UI.

api.selectStory()

The selectStory API method allows you to select a single story. It accepts the following two parameters; story kind name and an optional story name. For example:

<CodeSnippets paths={[ 'react/button-story-with-addon-example.js.mdx', 'react/button-story-with-addon-example.ts.mdx', 'vue/button-story-with-addon-example.js.mdx', 'vue/button-story-with-addon-example.ts.mdx', 'angular/button-story-with-addon-example.ts.mdx', 'svelte/button-story-with-addon-example.js.mdx', 'svelte/button-story-with-addon-example.ts.mdx', 'web-components/button-story-with-addon-example.js.mdx', 'web-components/button-story-with-addon-example.ts.mdx', ]} usesCsf3 csf2Path="addons/addons-api#snippet-button-story-with-addon-example" />

This is how you can select the above story:

<CodeSnippets paths={[ 'common/storybook-addons-api-selectstory.js.mdx', ]} />

api.selectInCurrentKind()

Similar to the selectStory API method, but it only accepts the story as the only parameter.

<CodeSnippets paths={[ 'common/storybook-addons-api-selectincurrentkind.js.mdx', ]} />

api.setQueryParams()

This method allows you to set query string parameters. You can use that as temporary storage for addons. Here's how you define query params:

<CodeSnippets paths={[ 'common/storybook-addons-api-setqueryparams.js.mdx', ]} />

Additionally, if you need to remove a query parameter, set it as null instead of removing them from the addon. For example:

<CodeSnippets paths={[ 'common/storybook-addons-api-disablequeryparams.js.mdx', ]} />

api.getQueryParam()

Allows retrieval of a query parameter enabled via the setQueryParams API method. For example:

<CodeSnippets paths={[ 'common/storybook-addons-api-getqueryparam.js.mdx', ]} />

api.getUrlState(overrideParams)

This method allows you to get the application URL state, including any overridden or custom parameter values. For example:

<CodeSnippets paths={[ 'common/storybook-addons-api-geturlstate.js.mdx', ]} />

api.on(eventName, fn)

This method allows you to register a handler function called whenever the user navigates between stories.

<CodeSnippets paths={[ 'common/storybook-addons-api-on.js.mdx', ]} />

addons.setConfig(config)

This method allows you to override the default Storybook UI configuration (e.g., set up a theme or hide UI elements):

<CodeSnippets paths={[ 'common/storybook-config-layout.js.mdx', ]} />

The following table details how to use the API values:

Name Type Description Example Value
navSize Number (pixels) The size of the sidebar that shows a list of stories 300
bottomPanelHeight Number (pixels) The size of the addon panel when in the bottom position 200
rightPanelWidth Number (pixels) The size of the addon panel when in the right position 200
panelPosition String Where to show the addon panel 'bottom' or 'right'
enableShortcuts Boolean Enable/disable shortcuts true
showToolbar Boolean Show/hide toolbar true
theme Object Storybook Theme, see next section undefined
selectedPanel String Id to select an addon panel storybook/actions/panel
initialActive String Select the default active tab on Mobile sidebar or canvas or addons
sidebar Object Sidebar options, see below { showRoots: false }
toolbar Object Modify the tools in the toolbar using the addon id { fullscreen: { hidden: false } } }

The following options are configurable under the sidebar namespace:

Name Type Description Example Value
showRoots Boolean Display the top-level nodes as a "root" in the sidebar false
collapsedRoots Array Set of root node IDs to visually collapse by default ['misc', 'other']
renderLabel Function Create a custom label for tree nodes; must return a ReactNode (item) => <abbr title="...">{item.name}</abbr>

The following options are configurable under the toolbar namespace:

Name Type Description Example Value
id String Toggle visibility for toolbar item { hidden: false }

Storybook hooks

To help streamline addon development and reduce boilerplate code, the API exposes a set of hooks to access Storybook's internals. These hooks are an extension of the @storybook/manager-api package.

useStorybookState

It allows access to Storybook's internal state. Similar to the useglobals hook, we recommend optimizing your addon to rely on React.memo, or the following hooks; useMemo, useCallback to prevent a high volume of re-render cycles.

<CodeSnippets paths={[ 'common/storybook-addons-api-usestorybookstate.js.mdx', ]} />

useStorybookApi

The useStorybookApi hook is a convenient helper to allow you full access to the Storybook API methods.

<CodeSnippets paths={[ 'common/storybook-addons-api-useapi.js.mdx', ]} />

useChannel

Allows setting subscriptions to events and getting the emitter to emit custom events to the channel.

The messages can be listened to on both the iframe and the manager.

<CodeSnippets paths={[ 'common/storybook-addons-api-usechannel.js.mdx', ]} />

useAddonState

The useAddonState is a useful hook for addons that require data persistence, either due to Storybook's UI lifecycle or for more complex addons involving multiple types (e.g., toolbars, panels).

<CodeSnippets paths={[ 'common/storybook-addons-api-useaddonstate.js.mdx', ]} />

useParameter

The useParameter retrieves the current story's parameters. If the parameter's value is not defined, it will automatically default to the second value defined.

<CodeSnippets paths={[ 'common/storybook-addons-api-useparameter.js.mdx', ]} />

useGlobals

Extremely useful hook for addons that rely on Storybook Globals. It allows you to obtain and update global values. We also recommend optimizing your addon to rely on React.memo, or the following hooks; useMemo, useCallback to prevent a high volume of re-render cycles.

<CodeSnippets paths={[ 'common/storybook-addons-api-useglobal.js.mdx', ]} />

useArgs

Hook that allows you to retrieve or update a story's args.

<CodeSnippets paths={[ 'common/args-usage-with-addons.js.mdx' ]} />

Learn more about the Storybook addon ecosystem