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Methods

Telegram Mini Apps methods are events, which execute some predefined action. They are always called by a Mini App.

Web

As long as the web version of Telegram displays the front-end application in <iframe/> tag, it uses the default way of communication between 2 iframes - sending messages through window.parent.postMessage function.

As the first parameter, you should pass a JSON object converted to a string. The object should have this interface:

typescript
interface MessageJSON {
  eventType: string;
  eventData: any;
}

The second parameter is targetOrigin - allowed parent iframe origin. We recommend avoiding the usage of wildcard * as long as it is not secure - your application could be inserted not by Telegram, but by another iframe that will still be able to communicate with your app and receive some data.

As a default value, you could use https://web.telegram.org.

So, as you see, each method has its own name expressed by eventType and parameters stored in eventData property. Here is the usage example:

typescript
const data = JSON.stringify({
  eventType: 'web_app_setup_back_button',
  eventData: {
    is_visible: true,
  },
});

window.parent.postMessage(data, 'https://web.telegram.org');

This code will make the Telegram BackButton appear.

Desktop and Mobile

Unlike the web, desktop and mobile applications use a bit more unusual way of calling methods. Both of these platforms will create a global function window.TelegramWebviewProxy.postEvent.

As the first argument, this function accepts the event name. The second one - the parameters object, converted to a string. Here is how it works:

typescript
const data = JSON.stringify({ is_visible: true });

window
  .TelegramWebviewProxy
  .postEvent('web_app_setup_back_button', data);

Windows Phone

Telegram Windows Phone app provides such function as window.external.notify. It accepts the same parameter as the web version does:

typescript
const data = JSON.stringify({
  eventType: 'web_app_setup_back_button',
  eventData: { is_visible: true },
});

window.external.notify(data);

Calling Methods

Handling all possible environments for a developer's application can be challenging. To simplify this process, the community developed the @telegram-apps/sdk package, which greatly eases integration.

Here's how to use it:

ts
import { postEvent } from '@telegram-apps/sdk';

postEvent('web_app_set_header_color', { color_key: 'bg_color' });

You can learn more about calling methods in the package's documentation.

Available Methods

This section contains a list of available methods to call with their names, description, and parameters. In case, Mini App does not satisfy the minimal method version requirement, nothing will happen. The native app just doesn't know which method should be called as long as it is not defined internally.

iframe_ready

Notifies parent iframe about the current frame is ready. This method is only used in the Web version of Telegram. As a result, Mini App will receive set_custom_style event.

FieldTypeDescription
reload_supportedbooleanOptional. True, if current Mini App supports native reloading.

iframe_will_reload

Notifies parent iframe about the current iframe is going to reload.

web_app_biometry_get_info

Available since: v7.2

Requests current biometry settings.

web_app_biometry_open_settings

Available since: v7.2

Opens the biometric access settings for bots. Useful when you need to request biometrics access to users who haven't granted it yet.

INFO

This method can be called only in response to user interaction with the Mini App interface (e.g. a click inside the Mini App or on the main button)

web_app_biometry_request_access

Available since: v7.2

Requests permission to use biometrics.

FieldTypeDescription
reasonstringOptional. The text to be displayed to a user in the popup describing why the bot needs access to biometrics, 0-128 characters.

web_app_biometry_request_auth

Available since: v7.2

Authenticates the user using biometrics.

FieldTypeDescription
reasonstringOptional. The text to be displayed to a user in the popup describing why you are asking them to authenticate and what action you will be taking based on that authentication, 0-128 characters.

web_app_biometry_update_token

Available since: v7.2

Updates the biometric token in secure storage on the device. To remove the token, pass an empty string.

FieldTypeDescription
tokenstringToken to store. Has max length of 1024 symbols.

web_app_close

Closes Mini App.

web_app_close_scan_qr_popup

Available since: v6.4

Closes a QR scanner. The Telegram application creates the scan_qr_popup_closed event.

web_app_data_send

Sends data to the bot. When this method is called, a service message is sent to the bot containing the data of the length up to 4096 bytes. Then, Mini App will be closed.

To get more information, take a look at web_app_data field in the class Message.

FieldTypeDescription
datastringData to send to a bot. Should not have size of more than 4096 bytes.

web_app_expand

Expands the Mini App.

web_app_invoke_custom_method

Available since: v6.9

FieldTypeDescription
req_idstringCurrent invocation unique identifier.
methodstringMethod name.
paramsunknownParameters according to method.

web_app_open_invoice

Available since: v6.1

Opens an invoice by its specified slug. More information about invoices in this documentation.

FieldTypeDescription
slugstringInvoice unique identifier.

Opens link in the default browser. Mini App will not be closed.

FieldTypeDescriptionAvailable since
urlstringURL to be opened by Telegram application. Should be a full path with https protocol.
try_instant_viewbooleanOptional. Link will be opened in Instant View mode if possible.v6.4

web_app_open_popup

Available since: v6.2

Opens a new popup. When user closes the popup, Telegram creates the popup_closed event.

FieldTypeDescription
titlestringThe text to be displayed in the popup title, 0-64 characters
messagestring The message to be displayed in the body of the popup, 1-256 characters
buttonsPopupButton[]List of buttons to be displayed in the popup, 1-3 buttons

PopupButton

FieldTypeDescription
idstringIdentifier of the button, 0-64 characters.
typestring Type of the button. Values:
  • default, a button with the default style
  • destructive, a button with a style that indicates a destructive action (e.g. "Remove", "Delete", etc.)
  • ok, a button with the localized text "OK"
  • close, a button with the localized text "Close"
  • cancel, a button with the localized text "Cancel"
textstring The text to be displayed on the button, 0-64 characters. Ignored when type is ok, close or cancel.

web_app_open_scan_qr_popup

Available since: v6.4

Opens a QR scanner. When the scanner was closed, the Telegram application creates the scan_qr_popup_closed event. When the scanner reads QR, Telegram creates the qr_text_received event.

FieldTypeDescription
textstringOptional. Text to be displayed in the QR scanner.

Available since: v6.1

Opens the Telegram link by its pathname and query parameters. The link will be opened in the Telegram app, Mini App will be closed.

FieldTypeDescription
path_fullstringShould be a value taken from the link of this format: https://t.me/{path_full}. Can additionally contain query parameters.

web_app_read_text_from_clipboard

Available since: v6.4

Reads text from the clipboard. The method accepts a request identifier which is used to appropriately retrieve the method execution result from the clipboard_text_received event.

FieldTypeDescription
req_idstringUnique request identifier. Should be any unique string to handle the generated event appropriately.

web_app_ready

Notifies Telegram about current application is ready to be shown. This method will make Telegram to remove application loader and display Mini App.

web_app_request_phone

Available since: v6.9

Requests access to current user's phone.

web_app_request_theme

Requests current theme from Telegram. As a result, Telegram will create theme_changed event.

web_app_request_viewport

Requests current viewport information from Telegram. As a result, Telegram will create viewport_changed event.

web_app_request_write_access

Available since: v6.9

Requests write message access to current user.

web_app_set_background_color

Available since: v6.1

Updates the Mini App background color.

FieldTypeDescription
colorstringThe Mini App background color in #RRGGBB format.

web_app_set_header_color

Available since: v6.1

Updates the Mini App header color. This method should accept color_key or color property.

FieldTypeDescriptionAvailable since
color_keystringThe Mini App header color key. Could be either bg_color or secondary_bg_color.
colorstringColor in RGB format.v6.9

web_app_setup_back_button

Available since: v6.1

Updates the Back Button settings.

FieldTypeDescription
is_visiblebooleanShould the Back Button be visible.

web_app_setup_closing_behavior

Updates current closing behavior.

FieldTypeDescription
need_confirmationbooleanWill user be prompted in case, an application is going to be closed.

web_app_setup_main_button

Updates the Main Button settings.

FieldTypeDescription
is_visiblebooleanOptional. Should the Main Button be displayed.
is_activebooleanOptional. Should the Main Button be enabled.
is_progress_visiblebooleanOptional. Should loader inside the Main Button be displayed. Use this property in case, some operation takes time. This loader will make user notified about it.
textstringOptional. Text inside the Main Button.
colorstringOptional. The Main Button background color in #RRGGBB format.
text_colorstringOptional. The Main Button text color in #RRGGBB format.

web_app_setup_settings_button

Available since: v6.10

Updates current state of Settings Button.

FieldTypeDescription
is_visiblebooleanShould the Settings Button be displayed.

web_app_switch_inline_query

Available since: v6.7

Inserts the bot's username and the specified inline query in the current chat's input field. Query may be empty, in which case only the bot's username will be inserted. The client prompts the user to choose a specific chat, then opens that chat and inserts the bot's username and the specified inline query in the input field.

FieldTypeDescription
querystring Text which should be inserted in the input after the current bot name. Max length is 256 symbols.
chat_typesstring[] List of chat types which could be chosen to send the message. Could be empty list. Values:
  • users
  • bots
  • groups
  • channels

web_app_trigger_haptic_feedback

Available since: v6.1

Generates the haptic feedback event.

FieldTypeDescription
typestring Type of haptic event. Values:
  • impact, when there's a collision involving UI components.
  • notification, when some action execution has been completed.
  • selection_change, when the user changes their selection.
impact_stylestring Required when type is impact. Values:
  • light, indicates a collision between small or lightweight UI objects
  • medium, indicates a collision between medium-sized or medium-weight UI objects
  • heavy, indicates a collision between large or heavyweight UI objects
  • rigid, indicates a collision between hard or inflexible UI objects
  • soft, indicates a collision between soft or flexible UI objects
notification_typestring Required when type is notification. Values:
  • error, indicates that a task or action has failed
  • success, indicates that a task or action has completed successfully
  • warning, indicates that a task or action produced a warning

Released under the MIT License.