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conversations.canvases.create method

Facts​

DescriptionCreate a channel canvas for a channel
Method Access
POST https://slack.com/api/conversations.canvases.create
Scopes
Bot token:
User token:
Content types
application/x-www-form-urlencoded
application/json
Rate LimitsTier 2: 20+ per minute

Arguments​

Required arguments

tokenstringRequired

Auth token with which to authenticate the session

Example: xxxx-xxxxxxxxx-xxxx
channel_idstringRequired

Channel ID of the channel the canvas will be tabbed in.

Optional arguments

document_contentOptional

Structure describing the type and value of the content to create

Example: {"type": "markdown", "markdown": "> channel canvas!"}
titlestringOptional

Title of the newly created canvas

Example: The Coolest Title Ever

Usage info​

This method is used to create a new channel canvas for the channel. Channel canvases can act as a resource hub, providing users with information highlights and channel-specific details. Once a channel canvas has been created with document_content, you will see the canvas icon in the upper right of the channel switch to indicate that a channel canvas now exists. This method returns an ok: true response with the canvas ID.

A canvas will be created empty if no content is provided, but will not result in an icon change.

The following formatting elements are supported in the document_content object:

  • bold
  • bulleted lists
  • checklist
  • canvas unfurl
  • code block
  • code span
  • divider (horizontal rule)
  • emojis—standard and custom
  • file unfurls
  • hard line break
  • headings h1-h3
  • italic
  • link (in line)
  • link reference
  • markdown table
  • message unfurl
  • ordered lists
  • paragraph
  • profile unfurl
  • quote block
  • strikethrough
  • website unfurl
  • @ mentions for users and channels

Calling conversations.canvases.create when a channel canvas already exists will result in a channel_canvas_already_exists response. You can find the ID of the canvas in the channel.properties.canvas section in the response of a conversations.info request.

In order for your app to create a channel canvas, it must have the proper permissions to do so. The channel must be public, or if it is private the app/user must be invited to the channel. Unlike the need to share a standalone canvas, there are no access implications nor is it necessary to share a channel canvas to grant access. Access is tied to channel access.

If you are looking to create a standalone canvas not associated with a particular channel, use the canvases.create method instead.

Response​

Typical success response

{
  "ok": true,
  "canvas_id": "F1234ABCD"
}

Typical error response when the channel canvas has already been created for the channel

{
  "ok": false,
  "error": "channel_canvas_already_exists"
}

Errors​

This table lists the expected errors that this method could return. However, other errors can be returned in the case where the service is down or other unexpected factors affect processing. Callers should always check the value of the ok parameter in the response.

Error
Description
access_denied

Access to a resource specified in the request is denied.

accesslimited

Access to this method is limited on the current network

account_inactive

Authentication token is for a deleted user or workspace when using a bot token.

canvas_creation_failed

Canvas was unable to be created.

canvas_disabled_user_team

Canvas is disabled on user's team

canvas_tab_creation_failed

Canvas tab was unable to be created.

channel_canvas_already_exists

Channel canvas for the specified channel already exists.

channel_canvas_creation_failed

Channel canvas was unable to be created.

deprecated_endpoint

The endpoint has been deprecated.

ekm_access_denied

Administrators have suspended the ability to post a message.

enterprise_is_restricted

The method cannot be called from an Enterprise.

fatal_error

The server could not complete your operation(s) without encountering a catastrophic error. It's possible some aspect of the operation succeeded before the error was raised.

free_team_canvas_tab_already_exists

Canvas tab for specified channel and team tier already exists.

internal_error

The server could not complete your operation(s) without encountering an error, likely due to a transient issue on our end. It's possible some aspect of the operation succeeded before the error was raised.

invalid_arg_name

The method was passed an argument whose name falls outside the bounds of accepted or expected values. This includes very long names and names with non-alphanumeric characters other than _. If you get this error, it is typically an indication that you have made a very malformed API call.

invalid_arguments

The method was called with invalid arguments.

invalid_array_arg

The method was passed an array as an argument. Please only input valid strings.

invalid_auth

Some aspect of authentication cannot be validated. Either the provided token is invalid or the request originates from an IP address disallowed from making the request.

invalid_charset

The method was called via a POST request, but the charset specified in the Content-Type header was invalid. Valid charset names are: utf-8 iso-8859-1.

invalid_form_data

The method was called via a POST request with Content-Type application/x-www-form-urlencoded or multipart/form-data, but the form data was either missing or syntactically invalid.

invalid_post_type

The method was called via a POST request, but the specified Content-Type was invalid. Valid types are: application/json application/x-www-form-urlencoded multipart/form-data text/plain.

method_deprecated

The method has been deprecated.

missing_post_type

The method was called via a POST request and included a data payload, but the request did not include a Content-Type header.

missing_scope

The token used is not granted the specific scope permissions required to complete this request.

no_permission

The workspace token used in this request does not have the permissions necessary to complete the request. Make sure your app is a member of the conversation it's attempting to post a message to.

not_allowed_token_type

The token type used in this request is not allowed.

not_authed

No authentication token provided.

org_login_required

The workspace is undergoing an enterprise migration and will not be available until migration is complete.

ratelimited

The request has been ratelimited. Refer to the Retry-After header for when to retry the request.

request_timeout

The method was called via a POST request, but the POST data was either missing or truncated.

restricted_action

User does not have permission to perform this action.

service_unavailable

The service is temporarily unavailable

team_access_not_granted

The token used is not granted the specific workspace access required to complete this request.

team_added_to_org

The workspace associated with your request is currently undergoing migration to an Enterprise Organization. Web API and other platform operations will be intermittently unavailable until the transition is complete.

team_tier_cannot_create_channel_canvases

Team tier cannot create channel canvases

token_expired

Authentication token has expired

token_revoked

Authentication token is for a deleted user or workspace or the app has been removed when using a user token.

two_factor_setup_required

Two factor setup is required.