SDK API Reference

Complete public surface of @contentstack/studio-react. All signatures are taken verbatim from dist/index.d.ts.

Do It With a Skill

This is a lookup, not a procedure. The skills that write against this surface are install-studio for initialization and register-component for the registration APIs.

Quick Map: “i Want To…”

Hooks

useCompositionData

Fetches a composition spec and the data required to render it. Supports lookup by compositionUid, url, or both.

declare function useCompositionData(
  compositionQuery: CompositionQueryInput,
  options?: CompositionQueryOptions,
): CompositionDataResult;

CompositionDataResult is a discriminated union: LoadingState | ErrorState | SuccessState. Every state has the same 5 keys (specOptions, isLoading, error, refetchSpec, refetchData) at runtime, but TS narrows the types across isLoading/error branches:

• LoadingState: { specOptions: null, isLoading: true, error: null }
• ErrorState: { specOptions: null, isLoading: false, error: NonNullable<unknown> }
• SuccessState: { specOptions: StudioComponentSpecOptions, isLoading: false, error: null }

Guard isLoading first, then error, then TS narrows specOptions to non-null. The error value is unknown: narrow with error instanceof Error before reading .message, or use String(error).

const { specOptions, isLoading, error } = useCompositionData({ url: "/about" });

useMultipleCompositions

Render N compositions in one pass with shared component loading and per-composition deduplication. Use this when a page is composed of multiple regions, each backed by its own composition (dashboards, landings with mixed-source regions, etc.). Avoids per-component duplicate fetches.

declare function useMultipleCompositions(
  queries: CompositionQueryInput[],
  options?: UseMultipleCompositionsOptions,
): UseMultipleCompositionsResult;

Pass an array of composition queries as the first argument (options are optional and second). The result is keyed back to each query so you can fan-out the specOptions to multiple <StudioComponent /> instances in render.

Re-exported hooks

From @contentstack/studio-react-components/hooks:

• useHiddenElementNotification: surfaces a notification when an authored element is hidden in the current breakpoint.
• useSelected: returns whether the current node is selected in the builder.

Components

StudioComponent

Main renderer with full editing capabilities. Mounts on template preview routes. Picks the right inner rendering path automatically based on mode (edit, show-edit-button, plain preview).

declare function StudioComponent(props: {
  specOptions: StudioComponentSpecOptions;       // required — what to render
  data?: ComposableStudioData["component_props"]; // optional — runtime Component Default Data, bindable from the canvas
}): JSX.Element;

<StudioComponent specOptions={specOptions} data={componentData} />

The data prop is the canonical hook for injecting external data into a composition: anything not in Contentstack (live pricing, geolocation, A/B variant, feature flags, weather, etc.). Whatever object you pass here becomes bindable inside the canvas through the Data Picker root “Component Default Data”. See Component Default Data: runtime data injection for the full pattern with worked examples.

PreviewRenderer

Internal-use renderer that accepts a raw StudioSpec. You should not need this: <StudioComponent specOptions={...} /> is the single user-facing renderer for both visitor and in-Studio routes. PreviewRenderer is exported by the SDK for advanced cases (custom batch-loading flows building their own spec pipeline). All canonical patterns in this doc set use StudioComponent.

declare function PreviewRenderer(props: {
  spec: Omit<StudioSpec, "compositionEntry"> & { compositionEntry?: StudioSpec["compositionEntry"] };
  data?: ComposableStudioData["component_props"];
}): JSX.Element;

StudioCanvas

The section-preview canvas. Mount it on a dedicated route (the project’s Canvas URL in Studio Settings) never a wildcard. It renders nothing outside Studio, discovers the composition being edited from the iframe URL, and fetches data automatically.

declare const StudioCanvas: () => JSX.Element | null;

<Route path="/canvas" element={<StudioCanvas />} />

VisualEditorCreateCompositionButton

Render-props button shown on 404 routes inside the Visual Builder to create a new linked composition.

declare function VisualEditorCreateCompositionButton(
  props: VisualEditorCreateCompositionButtonProps,
): React.ReactElement | null;

Render-props receive { isInsideVB, shouldShow, handleCreateComposition, isLoading }.

Registration

registerComponent

Register a single component.

declare function registerComponent(
  componentConfig: Parameters<ComponentRegistry["registerComponents"]>[0][0],
): void;

Design props. A prop config may carry design: true (allowed on choice and string props whose key is a camelCase CSS property, e.g. paddingInline). The prop becomes breakpoint-aware in the Settings tab and the component receives a generated class name under the prop key instead of the value. Invalid flags are warned and ignored at registration. See Design props.

registerLazyComponent

Register a component whose implementation is lazily loaded.

declare function registerLazyComponent(
  config: Omit<Parameters<ComponentRegistry["registerComponents"]>[0][0], "component">,
  loader: () => Promise<(props?: any) => React.ReactNode>,
): void;

registerComponents / registerPublicComponents

Bulk-register components. registerComponents is the public alias.

declare const registerComponents: typeof registerPublicComponents;

registerBreakpoints

Register responsive breakpoints. The first entry must be the default breakpoint and carries no media query.

declare const registerBreakpoints: (breakpoints: BreakpointInput) => void;

Design

registerDesignTokens

Register color / typography / spacing tokens. Returns a fully-typed DesignTokens object merged with defaults (unless allowDefaultDesignTokens: false).

declare function registerDesignTokens<T, O extends Partial<DesignTokensOptionsInput>>(
  designTokens: T,
  options?: O,
): DesignTokens<...>;

registerDesignClasses

Register named design classes. Use as const satisfies DesignClassesInput[] for best type inference.

declare function registerDesignClasses<C>(designClasses: C): DesignClassesNames<C>;

getDesignTokens / getDefaultDesignTokens

declare function getDesignTokens(): DesignTokens;
declare const getDefaultDesignTokens: () => any;

getDesignTokens() returns the resolved token map: each value is the var(--token-…) reference Studio generated. Read those references (rather than hand-writing the --token-… names, which aren’t derivable by hand) when you need to mirror Studio’s tokens into your own --brand-* variables at app shell.

See Design tokens for why hand-writing var(--token-…) references is discouraged.

Re-exports

• BUILT_IN_COMPONENTS, DesignTokens, DesignTokensInput, RegisterComponentOptionsInput: from @contentstack/studio-registry.
• extractStyles, studioSdk: from @contentstack/studio-core.
• registerJSONRTE: from @contentstack/studio-client.

Types

Exported type-only:

• Cslptag: { "data-cslp": string } | undefined. The CSLP tag for one bound field. Studio passes it alongside every bindable prop under the same name with a $ prefix (title becomes $title). Spreading it on the element that renders the value is what lets Visual Builder edit that value. Requires cslp: { appendTags: true } on studioSdk.init. See CSLP tags: the $ props that make bound values editable.
• StudioAttributes: { studioAttributes?: BuilderNodeInternalAttributes }. Attributes passed to a component when wrap: false, only populated inside the builder.
• PreviewRendererProps
• VisualEditorCreateCompositionButtonProps, VisualEditorCreateCompositionButtonRenderProps

Re-exported types: CompositionQueryForSSR, LightConfig, SearchQueryInput, StudioComponentFetchOptions, StudioComponentSpecOptions, StudioSpec, UserConfig, Node, CompositionQuery.

See Also

• Composition overview: what useCompositionData returns and how to render it.
• Canvas URL: pairing StudioCanvas with a dedicated canvas route.
• Registering components: using registerComponent and registerComponents.
• Design tokens: registerDesignTokens and registerDesignClasses in context.
• Component default data: populating the data prop on StudioComponent.
• Optimizing load: when to prefer registerLazyComponent.