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UI Extensions SDK reference

This document describes the SDK that a custom extension can use to communicate with the Contentful Web App and the Contentful Management API.

Table of Contents

Inclusion in your project

You will need to include the contentful-extension-sdk library in your HTML5 app:

<script src="https://unpkg.com/contentful-ui-extensions-sdk@3"></script>

The SDK is also distributed as an NPM package.

npm install --save contentful-ui-extensions-sdk

You can include it in your code base with

var contentfulExtension = require('contentful-ui-extensions-sdk')


The SDK exposes the contentfulExtension.init() method. This is the main entry point for all extension related code. If you require the script from the web without any module system the entry point is available as

window.contentfulExtension.init(function (extension) {
  var value = extension.field.getValue()
  extension.field.setValue("Hello world!")

If you use a CommonJS packager for the browser (e.g. Browserify) you need to require the Extensions SDK.

var contentfulExtension = require('contentful-ui-extensions-sdk')
contentfulExtension.init(function (extension) {
  /* ... */


This API gives you access to data about the content type and the entry. It has the form as described under "content type properties" in our api documentation.

Since 1.0.0


This API gives you access to the value and metadata of the field the extension is attached to.

If you use localization, an extension instance will be rendered for each locale. This means you can only change the value for the given locale. See the entry.fields API for how to change values for different locales.

If an entry returned by the Contentful Management API looks like the following:

  sys: { ... },
  fields: {
    title: {
      "en_US": "My Post"

Then the extension is attached to the title field and the en_US locale.

extension.field.getValue(): mixed

Gets the current value of the field and locale. In the example this would yield "My Post".

extension.field.setValue(value): Promise<void>

Sets the value for the field and locale. The promise is resolved when the change has been acknowledged. The type of the value must match the expected field type. For example, if the extension is attached to a "Symbol" field you must pass a string.

extension.field.removeValue(value): Promise<void>

Removes the value for the field and locale. A subsequent call to getValue() for the field would yield undefined.

extension.field.setInvalid(Boolean): undefined

Communicates to the Contentful web application if the field is in a valid state or not. This impacts the styling applied to the field container.

extension.field.onValueChanged(cb): function

Calls the callback every time the value of the field is changed by an external event (e.g. when multiple editors are working on the same entry) or when setValue() is called.

The method returns a function you can call to stop listening to changes.

Changed in v3.0.0

extension.field.onIsDisabledChanged(cb): function

Calls the callback when the disabled status of the field changes. A boolean indicating whether the field is disabled or not is passed to the callback.

The method returns a function that you can call to stop listening to changes.

extension.field.onSchemaErrorsChanged(cb): function

Calls the callback immediately with the current validation errors and whenever the field is re-validated. The callback receives an array of error objects. An empty array indicates no errors.

The errors are updated when the app validates an entry. This happens when loading an entry or when the user tries to publish it.

The method returns a function that you can call to stop listening to changes.

Since v2.1.0

extension.field.id: string

The ID of a field is defined in an entry's content type. Yields "title" in the example.

extension.field.locale: string

The current locale of a field the extension is attached to. Yields "en_US" in the example.

extension.field.type: string

Holds the type of the field the extension is attached to. The field type can be one of those described in our api documentation.

extension.field.validations: Validation[]

A list of validations for this field that are defined in the content type. The content type documentation provides more information on the shape of validations.

Since v2.1.0


This object allows you to read and update the value of any field of the current entry and to get the entry's metadata.

entry.getSys(): object

Returns metadata for an entry. The value coincides with the sys value of an entry returned by the v0.8.x of the Contentful Management API.

entry.onSysChanged(cb): function

Calls the callback with metadata every time that metadata changes. You can call the returned function to stop listening to changes.

entry.fields[id]: Field

In addition to extension.field, a extension can also control the values of all other fields in the current entry. Fields are referenced by their ID.

The Field API methods provide a similar interface to extension.field. The methods also accept an optional locale to change the value for a specific locale. It defaults to the space the space's default locale (see extension.locales). Providing an unknown locale throws an exception.

  • field.id: string
  • field.locales: Array<string>
  • field.getValue(locale?): mixed
  • field.setValue(value, locale?): Promise<void>
  • field.removeValue(locale?): Promise<void>
  • field.onValueChanged(locale?, cb): function
  • field.onIsDisabledChanged(locale?, cb): function


If the entry has a "title" field, you can transform it to upper case with:

var titleField = extension.entry.fields.title
var oldTitle = titleField.getValue()


The space object exposes methods that allow the extension to read and manipulate a wide range of objects in the space. Its API mirrors v0.8.x of the contentful-management library, with a few differences.

Content Types

Allows operating on the current space's content types. Content types created/updated or deleted this way will immediately be published or unpublished respectively.

  • space.getContentType(id)
  • space.getContentTypes()
  • space.createContentType(data)
  • space.updateContentType(data)
  • space.deleteContentType(data)


  • space.getEntry(id)
  • space.getEntries(query)
  • space.createEntry(data) The content type is expected in data.sys.contentType
  • space.updateEntry(data)
  • space.publishEntry(data)
  • space.unpublishEntry(data)
  • space.archiveEntry(data)
  • space.unarchiveEntry(data)
  • space.deleteEntry(data)
  • space.getPublishedEntries(query)


Same as the entry's method with "Entry" replaced by "Asset", with an additional space.processAsset(asset, locale).


A space can have multiple locales and each localized entry field can have different values for different locales. Locales are identified by their locale code, e.g. "en_US".

locales.default: string

The default locale for the current space.

locales.available: Array<string>

A list of all locales available in the current space.


This object holds information about the current user and roles. It has the following shape.

  sys: { id: 'b33ts' },
  firstName: 'Dwight',
  lastName: 'Schrute',
  email: 'dwight@dundermifflin.com',
  spaceMembership: {
    sys: { id: 'abc123xyz' }
    admin: false,
    roles: [{
      name: 'Assistant to the regional manager',
      description: 'Not “Assistant regional manager”',

The spaceMembership and roles objects have include a subset of the data from the corresponding resources in the Contentful Management API. You can find more information in the CMA Reference Documentation.

Since v3.3.0


The window object provides methods to update the size of the iframe the extension is contained within. This prevents scrollbars inside the extension.

To prevent a flickering scrollbar during height updates, it is recommended to set the extension's body to overflow: hidden;.


Calculates the body's scrollHeight and sets the containers height to this value.


Sets the iframe height to the given value in pixels. height must be an integer.


Listens for DOM changes and calls updateHeight() when the size changes.


Stops resizing the iframe automatically.


This object provides methods for opening UI dialogs:


Opens a dialog for selecting a single entry. It returns a promise resolved with the selected entity or null if a user closes the dialog without selecting anything.

options is an optional object configuring the dialog.The available options are:

  • locale: The code of a locale you want to use to display proper titles and descriptions. Defaults to the space's default locale.
  • contentTypes: An array of content type IDs of entries that you want to display in the selector. By default entries of all content types are displayed.
// display a dialog for selecting a single entry
dialogs.selectSingleEntry().then((selectedEntry) => {})

// select a single entry of "blogpost" content type
// and display result in "de-DE" locale
  locale: 'de-DE',
  contentTypes: ['blogpost']
}).then((selectedEntry) => {})

Since v3.1.0


Works similarly to selectSingleEntry, but allows to select multiple entries and the returned promise is resolved with an array of selected entries.

Both locale and contentTypes options can be used. There are two additional options:

  • min and max - numeric values specifying an inclusive range in which the number of selected entities must be contained
// display a dialog for selecting multiple entries
dialogs.selectMultipleEntries().then((arrayOfSelectedEntries) => {})

// select between 1 and 3 (inclusive) entries
dialogs.selectMultipleEntries({min: 1, max: 3})
.then((arrayOfSelectedEntries) => {})

Since v3.1.0


Counterpart of selectSingleEntry for assets. A contentTypes option is not available.

Since v3.1.0


Counterpart of selectMultipleEntries for assets. A contentTypes option is not available.

Since v3.1.0


Exposes extension configuration parameters as defined in the Content Management API reference.

extension.parameters has the following shape:

  installation: {
    retries: 10,
    isDevMode: true
  instance: {
    theme: 'light'

You can rely on both extension.parameters.installation and extension.parameters.instance being defined. If no parameters were provided they will default to an empty object:

  installation: {},
  instance: {}

Since v3.4.0