conversations.members

Retrieve members of a conversation.

Facts

Method URL: https://slack.com/api/conversations.members

Preferred HTTP method: GET

Accepted content types: application/x-www-form-urlencoded

Rate limiting: Tier 4

Works with:

Token type	Required scope(s)
bot	`bot`
workspace	`conversations:read`
user	`channels:read` `groups:read` `im:read` `mpim:read`

As part of the Conversations API, this method's required scopes depend on the type of channel-like object you're working with. For classic Slack apps, a corresponding channels: scope is required when working with public channels, groups: for private channels, also the same rules are applied for im: and mpim:. For workspace apps, a conversations: scope is all that's needed.

This Conversations API method returns a paginated list of members party to a conversation.

Arguments

Argument	Example	Required	Description
`token`	`xxxx-xxxxxxxxx-xxxx`	Required	Authentication token bearing required scopes.
`channel`	`C1234567890`	Required	ID of the conversation to retrieve members for
`cursor`	`dXNlcjpVMDYxTkZUVDI=`	Optional	Paginate through collections of data by setting the `cursor` parameter to a `next_cursor` attribute returned by a previous request's `response_metadata`. Default value fetches the first "page" of the collection. See pagination for more detail.
`limit`	`20`	Optional, default=100	The maximum number of items to return. Fewer than the requested number of items may be returned, even if the end of the users list hasn't been reached.

Present arguments as parameters in application/x-www-form-urlencoded querystring or POST body. This method does not currently accept application/json.

Response

Returns a list of user IDs belonging to the members in a conversation.

Typical paginated success response

{
    "ok": true,
    "members": [
        "U023BECGF",
        "U061F7AUR",
        "W012A3CDE"
    ],
    "response_metadata": {
        "next_cursor": "e3VzZXJfaWQ6IFcxMjM0NTY3fQ=="
    }
}

Typical error response when an invalid cursor is provided

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

Pagination

This method uses cursor-based pagination to make it easier to incrementally collect information. To begin pagination, specify a limit value under 1000. We recommend no more than 200 results at a time.

Responses will include a top-level response_metadata attribute containing a next_cursor value. By using this value as a cursor parameter in a subsequent request, along with limit, you may navigate through the collection page by virtual page.

For apps created after August 7, 2018, this method defaults to cursor-based pagination. Use the limit and cursor parameters to guarantee your passage into the paradise of cursored pagination.

See pagination for more information.

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 params in the response.

Error	Description
`method_not_supported_for_channel_type`	This type of conversation cannot be used with this method.
`missing_scope`	The calling token is not granted the necessary scopes to complete this operation.
`channel_not_found`	Value passed for `channel` was invalid.
`invalid_limit`	Value passed for `limit` was invalid.
`invalid_cursor`	Value passed for `cursor` was invalid.
`fetch_members_failed`	Failed to fetch members for the conversation.
`not_authed`	No authentication token provided.
`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.
`account_inactive`	Authentication token is for a deleted user or workspace.
`token_revoked`	Authentication token is for a deleted user or workspace or the app has been removed.
`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.
`org_login_required`	The workspace is undergoing an enterprise migration and will not be available until migration is complete.
`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_array_arg`	The method was passed a PHP-style array argument (e.g. with a name like `foo[7]`). These are never valid with the Slack API.
`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/x-www-form-urlencoded` `multipart/form-data` `text/plain`.
`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.
`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.
`request_timeout`	The method was called via a `POST` request, but the `POST` data was either missing or truncated.
`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.

Warnings

This table lists the expected warnings that this method will return. However, other warnings can be returned in the case where the service is experiencing unexpected trouble.

Warning	Description
`missing_charset`	The method was called via a `POST` request, and recommended practice for the specified `Content-Type` is to include a `charset` parameter. However, no `charset` was present. Specifically, non-form-data content types (e.g. `text/plain`) are the ones for which `charset` is recommended.
`superfluous_charset`	The method was called via a `POST` request, and the specified `Content-Type` is not defined to understand the `charset` parameter. However, `charset` was in fact present. Specifically, form-data content types (e.g. `multipart/form-data`) are the ones for which `charset` is superfluous.