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3.2.0 • Public • Published

Kontent.ai Smart Link SDK

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Kontent.ai Smart Link SDK simplifies and enhances the process of editing and managing web content in Web Spotlight by embedding "smart links" into your web pages. These smart links, defined by specific HTML data attributes you set, create a direct bridge to the Kontent.ai CMS. This allows content creators and editors to quickly navigate from the preview website to the corresponding content in the Kontent.ai platform for editing or previewing.

⚠️ Important note: Kontent.ai Smart Link SDK is a browser-only SDK, which means that the Node.js environment is not currently supported. Make sure to always initialize the Smart Link SDK in a browser context.

Table of Contents


  • ✏️ Edit Smart Links: Quickly navigate from your website's preview to the corresponding content in Kontent.ai, making content editing seamless and efficient.
  • Add Smart Links: Simplify the addition of modular content directly from your preview, enhancing content management without leaving the web context.
  • 🔄️ Automatic Reloads/Rebuilds: Set up the automatic webpages reloads when your content is ready in the Delivery Preview API, ensuring your preview always reflects the latest saved changes.
  • 👀 Live Preview: Experience real-time content changes even before they're saved, enabling a dynamic editing process that boosts productivity.


You can install this library using npm or using global CDNs such as jsdelivr.


npm i @kontent-ai/smart-link


When you include the UMD bundle of this library in the script tag of your HTML page, an SDK becomes available under the KontentSmartLink global variable. Both the JS bundle and its minified version can be found in the dist folder.

  • dist/kontent-smart-link.umd.min.js
  • dist/kontent-smart-link.umd.js


Gzip browser bundle

<script type='text/javascript'

Gzip browser bundle

<script type='text/javascript'

To prevent potential issues from arising due to breaking changes, it is recommended to replace @latest with a specific version number.



To integrate the Kontent.ai Smart Link SDK into your web project and enable smart link injection, follow these steps:

  1. Include SDK: Add the SDK to your project. You can do this by installing it from npm or embedding the UMD bundle in the script tag of your HTML page.
  2. Specify HTML data attributes: Define the HTML data attributes on your webpage elements where you want the smart links to appear. Detailed guidance on setting these attributes can be found here.
    <main data-kontent-project-id='00000000-0000-0000-0000-000000000000' data-kontent-language-codename='default'>
      <div data-kontent-item-id='00000000-0000-0000-0000-000000000000'>
        <div data-kontent-element-codename='title'>Title</div>
  3. Initialization: Initialize the SDK in your code to create the smart link to Kontent.ai. You can read more about SDK initialization here.
    const instance = KontentSmartLink.initialize({
      defaultDataAttributes: {
        projectId: '00000000-0000-0000-0000-000000000000',
        languageCodename: 'default', 
  4. Set up the custom autorefresh behavior (optional): The automatic page refresh feature after content is available on Delivery Preview API is enabled out of the box. However, in some situations you may need to define some custom behavior. You can read more about it here.
  5. Set up the live preview (optional): Make sure your website know how to react to the live preview messages from Kontent.ai. You can read more about live preview here.

For more complex examples, check the Examples section.

Data attributes

The Kontent.ai Smart Link SDK relies heavily on manually specified data attributes in your HTML markup to function properly. These attributes are essential for the SDK to identify where and how to integrate smart links into your content, they also enable the SDK to access necessary information, such as the Kontent.ai project ID and element codenames. It's important to note that the SDK does not automatically insert these data attributes into your HTML. You are responsible for adding them manually.

Available data attributes

Attribute Value Description
data-kontent-project-id guid Kontent.ai environment ID.
data-kontent-language-codename string Kontent.ai language codename.
data-kontent-item-id guid Content item ID.
data-kontent-component-id guid Content component ID.
data-kontent-element-codename string Content type element codename.
data-kontent-add-button - Specifies that node should have add-button rendered near it.
data-kontent-add-button-insert-position start | before | after | end Specifies the insert position of an item/content component added using add button.
data-kontent-add-button-render-position bottom-start | bottom | bottom-end | left-start | left | left-end | top-start | top | top-end | right-start | right | right-end Specifies visual location of add button.
data-kontent-disable-features highlight Specifies that the selected node should not have highlight (which includes edit smart links). Useful when there are too many smart links on your page.

Data attributes hierarchy

Setting up data attributes in a hierarchical structure is a strategic approach to simplify your integration with the Kontent.ai Smart Link SDK. This method eliminates the need to repeat attributes across multiple elements, making your code cleaner and more maintainable.

Hierarchical setup explained:
  • Project-Level Attributes: Begin by assigning the data-kontent-project-id attribute to a high-level element, such as the <body> tag. That approach ensures that all elements within the body inherit this project identifier, linking them to your specific Kontent.ai project. Similarly, if your content is published in a single language, assign the data-kontent-language-codename alongside the project ID to establish the language context for all contained elements.
  • Content-Specific Attributes: Next, identify elements representing individual content items or components within your webpage. Assign each a data-kontent-item-id, making these elements recognizable to the SDK as distinct pieces of content. For elements corresponding to specific fields or components within these elements, use the data-kontent-element-codename to map each directly to its counterpart in Kontent.ai.
  • Nested Content: In scenarios involving rich text or linked items that contain additional content elements, continue this hierarchical assignment. Place relevant item or component IDs on their respective container elements.
  • Content Components: Unlike standard content items, content components are designed to be used within a specific rich text element and do not appear as standalone items in you Content Inventory. To effectively integrate these content components with the Kontent.ai Smart Link SDK, it's essential to mark them with the data-kontent-component-id attribute within your HTML, ensuring it's correctly linked to its parent content item in the CMS.

Smart links

The Kontent.ai Smart Link SDK supports four distinct types of smart links, each designed to enhance your content editing workflow. These smart links are powered by the data attributes from the previous section and primarily function within the Web Spotlight preview iframe.

Edit element smart link

This smart link enables direct editing of a content item's specific element within the preview. When clicked:

  • Inside Web Spotlight: Opens the In-Context editor, focusing on the selected element.
  • Outside Web Spotlight: Redirects to the corresponding item in the Kontent.ai editor.

Data Attributes: data-kontent-project-id, data-kontent-language-codename, data-kontent-item-id, data-kontent-component-id? (optional), and data-kontent-element-codename.

<div data-kontent-project-id='00000000-0000-0000-0000-000000000000' data-kontent-language-codename='default'>
  <section data-kontent-item-id='00000000-0000-0000-0000-000000000000'>
    <div data-kontent-element-codename='codename'>Content</div>

Edit content component smart link

This smart link enables direct editing of content components within the preview. It triggers the In-Context editor and brings the component into view.

Availability: Exclusive to the Web Spotlight environment.

Data attributes: data-kontent-project-id, data-kontent-language-codename, data-kontent-item-id, and data-kontent-component-id.

<div data-kontent-project-id='00000000-0000-0000-0000-000000000000' data-kontent-language-codename='default'>
  <section data-kontent-item-id='00000000-0000-0000-0000-000000000000'>
    <div data-kontent-component-id='00000000-0000-0000-0000-000000000000'>

Edit content item smart link

This smart link enables the editing of entire content items through a preview click, opening the In-Context editor.

Availability: Exclusive to the Web Spotlight environment.

Data attributes: data-kontent-project-id, data-kontent-language-codename, and data-kontent-item-id.

<div data-kontent-project-id='00000000-0000-0000-0000-000000000000' data-kontent-language-codename='default'>
  <section data-kontent-item-id='00000000-0000-0000-0000-000000000000'>

Add content smart link

This smart link enables the addition of new modular content directly within your page's preview, supporting both rich-text and linked item elements.

Availability: Exclusive to the Web Spotlight environment.

Fixed add content smart link

Fixed add content smart link positions new content at predetermined points of the target rich-text or linked items (start or end).

Data attributes: data-kontent-project-id, data-kontent-language-codename, data-kontent-item-id, data-kontent-component-id? (optional), data-kontent-element-codename (codename of the rich-text or linked items element), data-kontent-add-button, data-kontent-add-button-render-position?, data-kontent-add-button-insert-position=start|end.

<div data-kontent-project-id='00000000-0000-0000-0000-000000000000' data-kontent-language-codename='default'>
  <section data-kontent-item-id='00000000-0000-0000-0000-000000000000'>
Relative add content smart link

Relative add content smart link allows new content to be placed relative to existing elements (before or after). For example, you can insert a new content component before or after the existing content component in rich-text element. To turn add content smart link into a relative one, you need to set data-kontent-insert-position to before or after and provide target id on the same node using data-kontent-item-id or data-kontent-component-id attribute.

Data attributes: data-kontent-project-id, data-kontent-language-codename, data-kontent-item-id, data-kontent-component-id? (optional), data-kontent-element-codename (codename of the rich-text or linked items element), data-kontent-item-id|data-kontent-component-id (target item), data-kontent-add-button, data-kontent-add-button-render-position?, data-kontent-add-button-insert-position=before|after.

<div data-kontent-project-id='00000000-0000-0000-0000-000000000000' data-kontent-language-codename='default'>
  <section data-kontent-item-id='00000000-0000-0000-0000-000000000000'>
    <div data-kontent-element-codename='rich-text-element-codename'>

SDK initialization

To activate the Kontent.ai Smart Link SDK on your website, you need to initialize it after setting up all required data attributes. The SDK offers two methods for initialization:

  • initialize: Instantly initializes the SDK, making it ready to use. This method is ideal when your webpage is fully loaded or when SDK initialization occurs after the document's DOMContentLoaded event.
    const instance = KontentSmartLink.initialize({ queryParam: "preview" });
  • initializeOnLoad: Delays SDK initialization until the entire page has loaded. This approach is particularly useful for including the SDK in the <head> of your webpage, ensuring that all page elements are fully loaded before initialization begins.
    KontentSmartLink.initializeOnLoad().then(instance => {
      // SDK is fully initialized and ready to use

Both methods return an SDK instance, with initializeOnLoad returning a promise that resolves to an instance. It is important to manage this instance appropriately:

  • Accessing the SDK instance: Store the returned instance if you need to access SDK methods after initialization.
  • Resource management: The SDK leverages event listeners, timeouts, and observers to function properly. To prevent memory leaks or unintended behavior always invoke the .destroy() method on the SDK instance before re-initializing the SDK. This is crucial in single-page applications or dynamic webpages where content might be loaded multiple times without a full page refresh.
    useEffect(() => {
      const instance = KontentSmartLink.initialize();
      return () => instance.destroy(); 


Customize how the SDK operated on your preview website with optional configuration arguments passed during initialization. Configuration can be adjusted post-initialization using the setConfiguration method.

Attribute Default Description
debug false Set to true to enable detailed logging, aiding in development and troubleshooting. Note: This may impact performance.
defaultDataAttributes { projectId: undefined, languageCodename: undefined } Define default values for essential data attributes to streamline setup.
queryParam ksl-enabled Name of the query parameter that must be present in the URL to turn the smart link injection on. It is not necessary for query parameter to have a truthy value (just the presence of this query parameter is checked). If set to falsy value ('', null), the smart link injection will always be enabled. Query parameter is only used outside Web Spotlight.


The following custom CSS properties can be used to customize the visuals of the SDK output.

Custom property Default Description
--ksl-color-background-default rgba(255, 255, 255, 1) Default background color used in toolbar and popover.
--ksl-color-background-default-disabled rgba(223, 223, 223, 1) Disabled background color for buttons inside toolbar and popover.
--ksl-color-background-default-hover rgba(21, 21, 21, 0.1) Hover background color for buttons inside toolbar and popover.
--ksl-color-background-default-selected rgba(255, 240, 239, 1) Selected background color for buttons inside toolbar and popover.
--ksl-color-background-secondary rgba(20, 22, 25, 1) Secondary background color used in tooltips.
--ksl-color-primary rgba(219, 60, 0, 1) Primary color used as a hover border color in highlights and as a background color in add buttons.
--ksl-color-primary-hover rgba(149, 48, 0, 1) Primary color used as a hover background color in add buttons.
--ksl-color-primary-transparent rgba(219, 60, 0, 0.5) Primary color with transparency used as a default border color in highlights.
--ksl-color-text-default rgba(255, 255, 255, 1) Text color used on a default background (buttons inside toolbar and popover).
--ksl-color-text-default-disabled rgba(140, 140, 140, 1) Disabled text color used on a default background.
--ksl-color-text-secondary rgba(21, 21, 21, 1) Text color used inside tooltips and add buttons.
--ksl-shadow-default 0 8px 32px rgba(16, 33, 60, 0.24), 0 0 8px rgba(0, 0, 0, 0.03) Default shadow for toolbar.
--ksl-shadow-primary 0 8px 10px rgba(219, 60, 0, 0.2), 0 6px 20px rgba(219, 60, 0, 0.12), 0 8px 14px rgba(219, 60, 0, 0.14) Shadow for add buttons.
--ksl-z-index 9000 Base value of z-index used for calculation of individual values for each ksl-element type

These styles can be applied globally using the :root selector or scoped to specific elements for more precise theming.

:root {
    --ksl-color-background-default: rgba(4, 102, 200, 1);
    --ksl-color-background-default-disabled: rgba(2, 62, 125, 1);
    --ksl-color-background-default-hover: rgba(0, 40, 85, 0.1);
    --ksl-color-background-secondary: rgba(2, 62, 125, 1);
    --ksl-color-background-default-selected: rgba(3, 83, 164, .1);
    --ksl-color-primary: rgba(4, 102, 200, 1);
    --ksl-color-primary-transparent: rgba(4, 102, 200, 0.5);
    --ksl-color-primary-hover: rgba(2, 62, 125, 1);
    --ksl-color-text-default: rgba(255, 255, 255, 1);
    --ksl-color-text-default-disabled: rgba(51, 65, 92, 1);
    --ksl-color-text-secondary: rgba(255, 255, 255, 1);
    --ksl-shadow-default: 0 8px 32px rgba(0, 24, 69, 0.24), 0 0 8px rgba(0, 0, 0, 0.03);
    --ksl-shadow-primary: 0 8px 10px rgba(4, 102, 200, 0.2), 0 6px 20px rgba(4, 102, 200, 0.12), 0 8px 14px rgba(4, 102, 200, 0.14);
    --ksl-z-index: 9000;

Preview autorefresh in Web Spotlight

Maintaining an up-to-date preview is essential when editing content in Web Spotlight using the in-context editor. The Kontent.ai Smart Link SDK introduces a preview autorefresh feature from version 2.2.0 onwards, ensuring your preview automatically updates after your changes are saved without manual refreshes.

Prerequisites for autorefresh

To enable autorefresh in your preview web app, ensure:

  1. SDK Version: Your application is using the latest version of the Smart Link SDK.
  2. API Header: The X-KC-Wait-For-Loading-New-Content header is set to true for requests to the Delivery Preview API.

With these conditions met, Web Spotlight automatically refreshes the preview once your changes are ready on Delivery Preview API, streamlining the editing process.

Advanced: Implementing a custom refresh handler

There are scenarios where a full page refresh may not be ideal, such as when using a static site generator or when aiming to update only a portion of the page. To accommodate diverse needs, the Smart Link SDK offers the capability to define a custom refresh handler.

This custom handler overrides the default refresh behavior, allowing for tailored refresh logic based on your specific requirements. Implement it as follows:

import { IRefreshMessageData } from './IFrameCommunicatorTypes';

const sdk = KontentSmartLink.initialize();

sdk.on(KontentSmartLinkEvent.Refresh, (data, metadata, originalRefresh) => {
  // Implement your custom refresh logic here

You can then unregister the custom handler using the .off method.

For more complex example, check the Examples section.

Parameters for the custom refresh handler
Argument Type Description
Data { projectId: string, languageCodename: string, updatedItemCodename: string } | undefined Provides details on the updated item that caused autorefresh. It is only available when refresh is triggered automatically.
Metadata { manualRefresh: boolean } Manual refresh is set to true when the refresh was user-initiated.
Original refresh () => void The SDK's default refresh function.

Live preview in Web Spotlight

As of version 3.2.0, the Kontent.ai Smart Link SDK introduces support for live preview within Web Spotlight. This feature enhances the content editing experience by providing real-time updates within your preview environment through iframe communication immediately after edits are made in the in-context editor.

Note: The live preview requires manual integration to function. Your preview website will not automatically update with changes; it is your responsibility to implement how these updates are processed and displayed in your application.

Implementing live preview in your application

To set up live preview, listen for update events from the SDK. These events are triggered after content is edited in Kontent.ai, providing you with the updated data:

import KontentSmartLink, { KontentSmartLinkEvent } from '@kontent-ai/smart-link';

// Initialize the SDK
const sdk = KontentSmartLink.initialize({ ... });

// Listen for updates and apply them to your application
sdk.on(KontentSmartLink.Update, (data: IUpdateMessageData) => {
  // Use this data to update your application state or UI as needed

For more complex example, check the Examples section.

Data contract

The Update event delivers data of type IUpdateMessageData, containing detailed information about the updated content elements:

interface IUpdateMessageData {
  projectId: string;
  variant: {
    id: string;
    codename: string;
  item: {
    id: string;
    codename: string;
  elements: ReadonlyArray<{
    element: {
      id: string;
      codename: string;
    type: ElementType,
    data: Omit<Element, 'type' | 'name'>

You can find ElementType and Element definition in @kontent-ai/delivery-sdk repository.

Modular content in live preview

Live preview updates for content items that include linked items only provide the codenames of these linked items. To fully update your application with changes to these linked items, you may need to fetch their full details from the Delivery Preview API after receiving the live update message. This ensures that all parts of your content are up-to-date.

Content components within rich text elements, however, are directly included in the live update messages. This means changes to these components are immediately reflected in the live preview, without needing additional fetches.

Combining autorefresh and live preview

While autorefresh ensures that content updates are accurately reflected post-save, live preview offers the advantage of immediate visual feedback before changes are saved. To maximize content management efficiency, we recommend using live preview for instant editing feedback and relying on autorefresh to confirm that all changes are correctly saved and displayed. This combination provides a seamless editing experience, allowing content editors to preview changes in real-time and ensuring that the final content displayed is up-to-date with the Delivery Preview API.

Outside Web Spotlight

When used outside of Web Spotlight, the SDK leverages URL query parameters to manage the activation of smart links. By default, it looks for the ksl-enabled parameter in the webpage URL. However, this parameter can be customized using the queryParam option during SDK initialization.

The SDK only checks for the presence of this query parameter, disregarding its value. As such, any of the following configurations are considered valid:

  • ?ksl-enabled=true
  • ?ksl-enabled=false
  • ?ksl-enabled

The features that could be used outside of Web Spotlight are limited. For detailed information about the types of smart links that are supported in this context, please refer to the Smart Links section.

Inside Web Spotlight

If the SDK detects that it is run inside an iframe, it attempts to connect to Web Spotlight through iframe messages early during initialization. Upon successful communication with Web Spotlight, the SDK disables query parameter reliance and activates additional functionalities designed for in-context editing and preview.

Iframe communication

The SDK and Web Spotlight exchange a series of messages for various interactions, from initialization to content editing and refresh requests. All message types are listed below.

Message Data Origin Description
kontent-smart-link:initialized { projectId: string | null, languageCodename: string | null, enabled: boolean } SDK This message is sent by the SDK when it is initialized.
kontent-smart-link:initialized:response - Host This message is sent by the host as a response to initialized message.
kontent-smart-link:status { enabled: boolean } Host This message is used to toggle the SDK features.
kontent-smart-link:element:clicked { projectId: string, languageCodename: string, itemId: string, contentComponentId?: string, elementCodename: string } SDK This message is sent by the SDK when element with data-kontent-element-codename attribute is clicked.
kontent-smart-link:content-component:clicked { projectId: string, languageCodename: string, itemId: string, contentComponentId: string } SDK This message is sent by the SDK when element with data-kontent-component-id attribute is clicked.
kontent-smart-link:content-item:clicked { projectId: string, languageCodename: string, itemId: string } SDK This message is sent by the SDK when element with data-kontent-item-id attribute is clicked.
kontent-smart-link:add:initial { projectId: string, languageCodename: string, itemId: string, contentComponentId?: string, elementCodename: string, insertPosition: { targetId?: string, placement: 'start' | 'end' | 'before' | 'after', } } SDK This message is sent by the SDK when add button is clicked.
kontent-smart-link:add:initial:response { elementType: 'LinkedItems' | 'RichText' | 'Unknown', isParentPublished: boolean, permissions: Map<string,string> } Host This message is sent by the host as a response to initial add button click.
kontent-smart-link:add:action { projectId: string, languageCodename: string, itemId: string, contentComponentId?: string, elementCodename: string, action: string, insertPosition: { targetId?: string, placement: 'start' | 'end' | 'before' | 'after', } } SDK This message is sent by the SDK when add button action is clicked.
kontent-smart-link:preview:refresh { projectId: string, languageCodename: string, updatedItemCodename: string } | undefined Host This message is sent when preview has to be refreshed.
kontent-smart-link:preview:current-url - Host This message is sent by host as a request to get URL of current iframe.
kontent-smart-link:preview:current-url:response { previewUrl: string } SDK This message is sent by SDK as a response on the kontent-smart-link:preview:current-url message.
kontent-smart-link:preview:update Data contract Host This message is sent by host when an element value has been changed in the in-context editor.



This example demonstrates how to quickly integrate the Kontent.ai Smart Link SDK into a webpage using a CDN. It's ideal for static sites or projects without a build process, allowing you to enhance your preview with smart link capabilities using straightforward HTML and JavaScript.

    <title>Kontent.ai Smart Link - HTML example</title>
    <!-- Include the SDK from a CDN -->
    <script type='text/javascript'
    <script type='text/javascript'>
      // Initialize the SDK upon page load
      KontentSmartLink.initializeOnLoad({ queryParam: 'preview' }).then((sdk) => {
        // NOTE: this is just an example of what your live preview implementation may look like
        sdk.on("update", (data) => {
          data.elements.forEach((i) => {
            const codename = i.element.codename;
            const domElement = document.querySelector(`[data-kontent-element-codename=${codename}]`);
            if (domElement) {
              domElement.innerHTML = i.data.value;
  <body data-kontent-project-id='1d50a0f7-9033-48f3-a96e-7771c73f9683' data-kontent-language-codename='en-US'>
    <!-- Example content with data attributes for smart link injection -->
    <nav class='navigation' data-kontent-item-id='6ea11626-336d-47e5-9f35-2d44fa1ad6d6'>
      <img class='navigation__logo' data-kontent-element-codename='logo' />
        <li class='navigation__list-item' data-kontent-component-id='036acd8f-5e6d-4023-b0f8-a4b8e0b573b1'>
          <span data-kontent-element-codename='title'>Home</span>
        <li class='navigation__list-item' data-kontent-component-id='f539f1bc-9dc4-4df5-8876-dbb1de5ae6eb'>
          <span data-kontent-element-codename='title'>About us</span>
        <img class='home__banner' data-kontent-element-codename='image' />
        <h1 data-kontent-element-codename='title'>Home page</h1>
        <p data-kontent-element-codename='text'>...</p>

Note: Make sure to replace @3.2.0 with the latest SDK version for improved features and fixes.


For projects using modern JavaScript frameworks or build systems, this example illustrates how to import and initialize the Kontent.ai Smart Link SDK within an ES6 module. This approach is well-suited for applications built with tools like Webpack, Rollup, or when working within SPA frameworks like React, Vue, or Angular.

import KontentSmartLink, { KontentSmartLinkEvent } from "@kontent-ai/smart-link";

// This is just an example of SDK initialization inside ES6 module.
// HTML markup should still contain all necessary data-attributes.
const kontentSmartLink = KontentSmartLink.initialize({
  debug: true,
  defaultDataAttributes: {
    projectId: "1d50a0f7-9033-48f3-a96e-7771c73f9683",
    languageCodename: "default",
  queryParam: "ksl-preview"

kontentSmartLink.on(KontentSmartLinkEvent.Update, (data) => {
  // Update content of the page using data

Tip: Adjust defaultDataAttributes according to your Kontent.ai project's ID and language codename.


In a React application, we recommend utilizing React's Context API to create a centralized store for the SDK instance, ensuring easy access and management of smart links within your component tree. This advanced example demonstrates setting up a SmartLinkContext to provide a Kontent.ai Smart Link SDK instance throughout your React application.

Creating the SmartLink context

// src/contexts/SmartLink.tsx
import React, { PropsWithChildren, useContext, useState, useMemo, useEffect } from 'react';
import KontentSmartLink, { KontentSmartLinkEvent } from '@kontent-ai/smart-link';
import {
} from '@kontent-ai/smart-link/types/lib/IFrameCommunicatorTypes';

interface SmartLinkContextValue {
  readonly smartLink?: KontentSmartLink | null;

const defaultContextValue: SmartLinkContextValue = {
  smartLink: undefined,

const SmartLinkContext = createContext<SmartLinkContextValue>(defaultContextValue);

export const SmartLinkProvider: React.FC<PropsWithChildren> = ({ children }) => {
  const [smartLink, setSmartLink] = useState<KontentSmartLink>(null);

  useEffect(() => {
    const instance = KontentSmartLink.initialize({
      queryParam: 'preview',
      defaultDataAttributes: {
        projectId: 'your-project-id', // Replace 'your-project-id' with your actual project ID
        languageCodename: 'your-language-codename', // Replace 'your-language-codename' with your actual language codename


    // Cleanup on component unmount
    return () => instance.destroy();
  }, []);

  const value = useMemo(() => ({ smartLink }), [smartLink]);

  return (

// Custom hook for easy access to the SmartLink instance
export const useSmartLink = (): KontentSmartLink | null => {
  const { smartLink } = useContext(SmartLinkContext);

  if (typeof smartLink === 'undefined') {
    throw new Error('You need to place SmartLinkProvider to one of the parent components to use useSmartLink.');

  return smartLink;

// Custom hook for easy setup of a custom refresh handler
export const useCustomRefresh = (callback: (data: IRefreshMessageData, metadata: IRefreshMessageMetadata, originalRefresh: () => void) => void): void => {
  const smartLink = useSmartLink();

  useEffect(() => {
    if (smartLink) {
      smartLink.on(KontentSmartLinkEvent.Refresh, callback);

      return smartLink.off(KontentSmartLinkEvent.Refresh, callback);

  }, [smartLink, callback]);

// Custom hook for easy access of live preview
export const useLivePreview = (callback: (data: IUpdateMessageData) => void): void => {
  const smartLink = useSmartLink();

  useEffect(() => {
    if (smartLink) {
      smartLink.on(KontentSmartLinkEvent.Update, callback);

      return smartLink.off(KontentSmartLinkEvent.Update, callback);

  }, [smartLink, callback]);

Using the SmartLink provider in your app:

// src/App.tsx
import React from 'react';
import { SmartLinkProvider } from './contexts/SmartLink';

const App: React.FC = () => {
  return (
      {/* Your app components go here, now with smart link support */}

Optimizing content updates in React with custom refresh logic

Using the custom refresh handler and the useCustomRefresh hook we defined in the previous example. It is possible to only update a small portion of the UI without reloading the entire page when your changes are available on Delivery Preview API.

The following example showcases an efficient approach to handling such content updates within a React application.

import React, { useState, useCallback, useContext } from 'react';
import { useCustomRefresh } from '../context/SmartLink'; // Ensure correct import path
import { IRefreshMessageData, IRefreshMessageMetadata } from '@kontent-ai/smart-link/types/lib/IFrameCommunicatorTypes';

const YourComponent: React.FC = () => {
  const [data, setData] = useState(null);
  const fetchData = useCallback((projectId, languageCodename, itemCodename) => {
    // Your data fetching logic here using a delivery-sdk or request to Delivery API endpoint
  }, []);

  // Define the custom refresh logic.
  const onRefresh = useCallback((data: IRefreshMessageData, metadata: IRefreshMessageMetadata, originalRefresh: () => void) => {
    // Check if the refresh was triggered manually and perform a full refresh if so.
    if (metadata.manualRefresh) {
    } else {
      // For automatic refreshes, refetch data for the updated item only.
      const { projectId, languageCodename, updatedItemCodename } = data;
      fetchData(projectId, languageCodename, updatedItemCodename);
  }, [fetchData]);

  // Use the custom refresh hook with the defined logic.

  return <div>{data}</div>;

Triggering SSG rebuilds with custom refresh logic

For websites built with static site generators, applying content updates typically requires triggering a rebuild of the site. The following example shows how you can initiate a rebuild with the custom refresh handler, ensuring that your site reflects the latest content changes.

This example uses Gatsby deployed to Netlify, but the solution for other SSG frameworks should be similar.

The following Netlify serverless function, deploy-status, checks the status of the latest deployment, enabling your application to wait for a rebuild to complete before refreshing the content.

// ./.netlify/functions/deploy-status.js
import fetch from 'node-fetch';

// Environment variables for Netlify site ID and access token
const siteId = process.env.NETLIFY_SITE_ID;
const token = process.env.NETLIFY_TOKEN;

// Handler to check the status of the last deployment
const handler = async event => {
  try {
    const endpoint = `https://api.netlify.com/api/v1/sites/${siteId}/deploys`;
    const result = await fetch(endpoint, { headers: { Authorization: `Bearer ${token}` } });
    const data = await result.json();

    // Assuming the first entry is the latest deployment
    const deploy = { state: data[0].state };

    return { statusCode: 200, body: JSON.stringify(deploy) };
  } catch (error) {
    return { statusCode: 500, body: error.toString() };

module.exports = { handler };

We can then trigger the rebuild process inside our custom refresh handler and wait for the deployment process to finish. After that the page can be refreshed using the originalRefresh callback.

import React, { useCallback, useEffect } from 'react';
import { useCustomRefresh } from '../context/SmartLinkContext'; // Adjust the import path as needed

const triggerRebuildOnNetlifyAndWaitForDeploy = useCallback(() => {
  // Trigger the Netlify build hook
  fetch('https://api.netlify.com/build_hooks/YOUR_BUILD_HOOK_ID?trigger_title=autorefresh', { method: 'POST' })
    .then(async () => {
      // Check the deployment status repeatedly until it's 'ready'
      const checkDeployStatus = async () => {
        const response = await fetch('/.netlify/functions/deploy-status');
        const { state } = await response.json();
        if (state !== 'ready') {
          setTimeout(checkDeployStatus, 3000); // Check again after 3 seconds

      await checkDeployStatus();
}, []);

const PageWithAutoRefresh = () => {
  useCustomRefresh((data, metadata, originalRefresh) => {
    if (!metadata.manualRefresh) {
    } else {

  // Page content goes here
  return <div>Page Content</div>;

export default PageWithAutoRefresh;

Live Preview in Your Application

Using the useLivePreview hook we defined in the previous example, you can enhance your application with real-time content updates during the editing process. This hook listens for live update messages from the Kontent.ai Smart Link SDK and applies those updates directly to the content item being displayed.

This example demonstrates setting up a useLivePreview hook within a React component to dynamically update content items as changes are made in the in-context editor.

import React, { useState, useCallback, useEffect } from 'react';
import { useLivePreview } from '../contexts/SmartLinkContext'; // Adjust the import path as needed
import { IContentItem } from '@kontent-ai/delivery-sdk/lib/models/item-models';
import { IUpdateMessageData } from '@kontent-ai/smart-link/types/lib/IFrameCommunicatorTypes';

// Function to update content item elements with live preview data
const updateContentItemElements = (item: IContentItem, data: IUpdateMessageData) => {
  return data.elements.reduce((acc, el) => {
    const { element, ...rest } = el;
    acc[element.codename] = { ...acc[element.codename], ...rest.data };
    return acc;
  }, item?.elements ?? {});

const useContentItem = (codename: string) => {
  const [item, setItem] = useState<IContentItem | null>(null);
  // Assume useDeliveryClient is a custom hook to obtain a configured delivery client instance
  const deliveryClient = useDeliveryClient();

  const handleLiveUpdate = useCallback((data: IUpdateMessageData) => {
    if (item && data.item.codename === codename) {
      const updatedElements = updateContentItemElements(item, data);
      setItem({ ...item, elements: updatedElements });
  }, [codename, item]);

  useEffect(() => {
    const fetchItem = async () => {
      // Fetch the content item initially and upon codename changes
      const response = await deliveryClient.item<IContentItem>(codename).toPromise();
  }, [codename, deliveryClient]);


  return item;

// Example component using the useContentItem hook
export const ContentItemComponent = ({ codename }) => {
  const item = useContentItem(codename);

  // Render logic for the content item
  return (
      {/* Render your content item here */}
      {/* More render logic */}

Known issues

Nested iframes

In scenarios where your content is displayed within nested iframes (e.g. to simulate different device resolutions, or to handle redirects to the right preview website based on the item), the SDK's initialization messages may not reach the top-level Web Spotlight iframe directly, affecting functionality. To address this, follow the guidance provided in this issue.

SameSite cookie in Next.js app

Next.js developers may encounter an issue with SameSite cookies not being set correctly. This can be solved by utilizing the code snippet below in your API route handling preview file to replace SameSite=Lax to SameSite=None; Secure; right after res.setPreviewData call.

const setCookieSameSite = (res, value) => {
  const cookies = res.getHeader("Set-Cookie");
  const updatedCookies = cookies?.map((cookie) =>
      `SameSite=${value}; Secure;`

export default function handler(req, res) {
  // ...

  setCookieSameSite(res, "None");
  // ...


Unit tests

Since this SDK highly depends on browser APIs, the unit tests are run by Karma test runner (+ Jasmine) inside Chrome browser. To run all tests in a watch mode you can use the npm run test:unit command. To run all tests only once you can use the npm run test:unit:ci command. All unit tests are located in the test-browser folder.

Visual regression tests

Visual regression testing is implemented using Storybook and Loki. Each story in Storybook represents a test case, which is then used by Loki to generate screenshots. In order to run visual regression tests you need to start Storybook using the npm run storybook command and then start loki testing using the npm run test:visual command. Or you can use the npm run test:visual:ci command to automatically start the Storybook server in a CI mode and run visual tests.

Visual regression tests use the built version of SDK, so before running them make sure you rebuild the SDK after the last change you made. You can this using the npm run build command or using the npm run dev command to start build in a watch mode.

Please note that the reference screenshots for visual regression tests are created on the ubuntu-latest environment, which is utilized in our GitHub Action workflow for visual tests. It means tests could (and probably will) fail on Windows. In case the visual regression tests fail during a pull request, and you need to update reference screenshots, you can locate the new screenshots in the failed GitHub Action run. Navigate to the Artifacts section (.loki/current) of the failed run to find the updated screenshots.

Breaking changes

All breaking changes can be found in a separate markdown file.

Feedback & Contribution

Feedback & Contributions are welcomed. Feel free to take/start an issue & submit PR.

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