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reactions.add method

Facts​

DescriptionAdds a reaction to an item.
Method Access
POST https://slack.com/api/reactions.add
Scopes
Bot token:
User token:
Content types
application/x-www-form-urlencoded
application/json
Rate LimitsTier 3: 50+ per minute

Arguments​

Required arguments

channelstringRequired

Channel where the message to add reaction to was posted.

namestringRequired

Reaction (emoji) name

Example: thumbsup
timestampstringRequired

Timestamp of the message to add reaction to.

tokenstringRequired

Authentication token bearing required scopes. Tokens should be passed as an HTTP Authorization header or alternatively, as a POST parameter.

Example: xxxx-xxxxxxxxx-xxxx

Usage info​

This method adds a reaction (emoji) to a message. Now that file threads work the way you'd expect, the file and file_comment arguments are deprecated. Specify only channel and timestamp instead.

For Unicode emoji that support skin tone modifiers, name may indicate a modifier by appending ::skin-tone- and a number from 2 to 6, like, thumbsup::skin-tone-6 or wave::skin-tone-3. This will add a reaction with the base emoji and the specified skin color.

Response​

Typical success response

{
  "ok": true
}

Typical error response

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

After making this call, the reaction is saved and a reaction_added event is broadcast via the Events and RTM APIs.

A not_reactable error is thrown when we decline the opportunity to attach your app's personally selected emoji reaction to a file or file comment. It's not because of how your app feels, it's because that approach is retired. Your app can express its inner reacji for any message though, by specifying channel and timestamp.

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.

already_reacted

The specified item already has the user/reaction combination.

bad_timestamp

Value passed for timestamp was invalid.

channel_not_found

Value passed for channel is invalid.

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.

external_channel_migrating

The channel is in the process of being migrated.

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.

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_name

Value passed for name was 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.

is_archived

Channel specified has been archived.

message_not_found

Message specified by channel and timestamp does not exist.

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_access

User does not have access to react to this canvas.

no_item_specified

combination of channel and timestamp was not specified.

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.

not_reactable

Whatever you passed in, like a file or file_comment, can't be reacted to anymore. Your app can react to messages though.

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.

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.

thread_locked

Reactions are disabled as the specified message is part of a locked thread.

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.

too_many_emoji

The limit for distinct reactions (i.e emoji) on the item has been reached.

too_many_reactions

The limit for reactions a person may add to the item has been reached.

two_factor_setup_required

Two factor setup is required.