Actions

The ballerinax/slack package exposes the following clients:

Client	Purpose
Client	Provides access to all Slack Web API methods for messaging, conversations, users, files, search, reactions, pins, and workspace administration.

---

Client

Provides access to all Slack Web API methods for messaging, conversations, users, files, search, reactions, pins, and workspace administration.

Configuration

Field	Type	Default	Description
auth	http:BearerTokenConfig|OAuth2RefreshTokenGrantConfig	Required	Authentication configuration: a bearer token record {token: "xoxb-..."} or an OAuth 2.0 refresh token grant config.
httpVersion	http:HttpVersion	HTTP_2_0	HTTP protocol version to use.
timeout	decimal	30	Request timeout in seconds.
retryConfig	http:RetryConfig	()	Retry configuration for failed requests.
secureSocket	http:ClientSecureSocket	()	SSL/TLS configuration.
proxy	http:ProxyConfig	()	Proxy server configuration.
validation	boolean	true	Enable response payload validation against the Slack API schema.
laxDataBinding	boolean	true	Allow lax data binding for API responses with extra fields.

Initializing the client

import ballerinax/slack;

configurable string token = ?;

slack:Client slackClient = check new ({
    auth: {
        token: token
    }
});

Operations

Messaging

Post a message to a channel

Sends a message to a public channel, private channel, or direct message.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID or name where the message will be posted (e.g., "C1234567890" or "general").
text	string	No	Message text. Required when blocks is not provided.
blocks	string	No	A JSON-encoded array of Block Kit layout blocks.
thread_ts	string	No	Timestamp of the parent message to reply to as a thread.
mrkdwn	boolean	No	Whether to parse Slack markdown in the message text.

Returns: ChatPostMessageResponse|error

Sample code:

slack:ChatPostMessageResponse response = check slackClient->/chat\.postMessage.post({
    channel: "C1234567890",
    text: "Hello from Ballerina!"
});

Sample response:

{
  "ok": true,
  "channel": "C1234567890",
  "ts": "1720000000.123456",
  "message": {
    "type": "message",
    "text": "Hello from Ballerina!",
    "user": "U0000BOT",
    "ts": "1720000000.123456"
  }
}

Update a message

Updates the text of an existing message in a channel.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID containing the message.
ts	string	Yes	Timestamp of the message to update.
text	string	No	New message text.

Returns: ChatUpdateResponse|error

Sample code:

slack:ChatUpdateResponse response = check slackClient->/chat\.update.post({
    channel: "C1234567890",
    ts: "1720000000.123456",
    text: "Updated: deployment completed successfully."
});

Sample response:

{
  "ok": true,
  "channel": "C1234567890",
  "ts": "1720000000.123456",
  "text": "Updated: deployment completed successfully."
}

Delete a message

Deletes a message from a channel.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID containing the message.
ts	string	Yes	Timestamp of the message to delete.

Returns: ChatDeleteResponse|error

Sample code:

slack:ChatDeleteResponse response = check slackClient->/chat\.delete.post({
    channel: "C1234567890",
    ts: "1720000000.123456"
});

Sample response:

{
  "ok": true,
  "channel": "C1234567890",
  "ts": "1720000000.123456"
}

Get a message permalink

Retrieves a permanent, public URL for a specific message.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID containing the message.
message_ts	string	Yes	Timestamp of the message.

Returns: ChatGetPermalinkResponse|error

Sample code:

slack:ChatGetPermalinkResponse response = check slackClient->/chat\.getPermalink({
    channel: "C1234567890",
    message_ts: "1720000000.123456"
});

Sample response:

{
  "ok": true,
  "channel": "C1234567890",
  "permalink": "https://myworkspace.slack.com/archives/C1234567890/p1720000000123456"
}

Post an ephemeral message

Sends an ephemeral message to a user in a channel: visible only to that user.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID where the ephemeral message is posted.
user	string	Yes	User ID of the recipient.
text	string	No	Message text.

Returns: ChatPostEphemeralResponse|error

Sample code:

slack:ChatPostEphemeralResponse response = check slackClient->/chat\.postEphemeral.post({
    channel: "C1234567890",
    user: "U0000001",
    text: "Only you can see this reminder."
});

Sample response:

{
  "ok": true,
  "message_ts": "1720000001.000100"
}

Schedule a message

Schedules a message to be sent to a channel at a specified future time.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID where the message will be posted.
post_at	int	Yes	Unix timestamp (seconds) indicating when to send the message.
text	string	No	Message text.

Returns: ChatScheduleMessageResponse|error

Sample code:

slack:ChatScheduleMessageResponse response = check slackClient->/chat\.scheduleMessage.post({
    channel: "C1234567890",
    post_at: 1800000000,
    text: "Good morning team! Daily standup starts in 15 minutes."
});

Sample response:

{
  "ok": true,
  "channel": "C1234567890",
  "scheduled_message_id": "Q1234ABCD",
  "post_at": 1800000000,
  "message": {
    "text": "Good morning team! Daily standup starts in 15 minutes.",
    "type": "delayed_message"
  }
}

List scheduled messages

Returns a list of scheduled messages.

Parameters:

Name	Type	Required	Description
channel	string	No	Filter to a specific channel ID.
limit	int	No	Maximum number of results to return.

Returns: ChatScheduledMessagesListResponse|error

Sample code:

slack:ChatScheduledMessagesListResponse response = check slackClient->/chat\.scheduledMessages\.list({
    channel: "C1234567890"
});

Sample response:

{
  "ok": true,
  "scheduled_messages": [
    {
      "id": "Q1234ABCD",
      "channel_id": "C1234567890",
      "post_at": 1800000000,
      "date_created": 1720000000,
      "text": "Good morning team! Daily standup starts in 15 minutes."
    }
  ],
  "response_metadata": {"next_cursor": ""}
}

Conversations

List all conversations

Returns a list of all channels in the Slack workspace.

Parameters:

Name	Type	Required	Description
types	string	No	Comma-separated list of channel types to include: public_channel, private_channel, mpim, im.
limit	int	No	Maximum number of channels to return per page.
exclude_archived	boolean	No	Exclude archived channels from the results.
cursor	string	No	Pagination cursor returned from a previous response.

Returns: ConversationsListResponse|error

Sample code:

slack:ConversationsListResponse response = check slackClient->/conversations\.list({
    types: "public_channel",
    exclude_archived: true,
    limit: 100
});

Sample response:

{
  "ok": true,
  "channels": [
    {"id": "C1234567890", "name": "general", "is_channel": true, "num_members": 42, "is_archived": false},
    {"id": "C0987654321", "name": "random", "is_channel": true, "num_members": 38, "is_archived": false}
  ],
  "response_metadata": {"next_cursor": "dGVhbTpDMDYxRkE3NkQ="}
}

Get conversation message history

Fetches a conversation's message history including all messages posted in the channel.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID to fetch history from.
limit	int	No	Maximum number of messages to return.
oldest	string	No	Only return messages after this Unix timestamp.
latest	string	No	Only return messages before this Unix timestamp.
cursor	string	No	Pagination cursor.

Returns: ConversationsHistoryResponse|error

Sample code:

slack:ConversationsHistoryResponse response = check slackClient->/conversations\.history({
    channel: "C1234567890",
    limit: 5
});

Sample response:

{
  "ok": true,
  "messages": [
    {"type": "message", "user": "U0000001", "text": "Deployment complete!", "ts": "1720000100.000200"},
    {"type": "message", "user": "U0000002", "text": "Great work everyone", "ts": "1720000000.123456"}
  ],
  "has_more": true,
  "response_metadata": {"next_cursor": "bmV4dF90czoxNzIwMDAwMDAwLjEyMzQ1Ng=="}
}

Get conversation thread replies

Retrieves all replies in a message thread.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID containing the thread.
ts	string	Yes	Timestamp of the parent (thread root) message.
limit	int	No	Maximum number of replies to return.

Returns: ConversationsRepliesResponse|error

Sample code:

slack:ConversationsRepliesResponse response = check slackClient->/conversations\.replies({
    channel: "C1234567890",
    ts: "1720000000.123456"
});

Sample response:

{
  "ok": true,
  "messages": [
    {"type": "message", "user": "U0000001", "text": "Any updates on the release?", "ts": "1720000000.123456", "reply_count": 2},
    {"type": "message", "user": "U0000002", "text": "Almost done, deploying now", "ts": "1720000010.000100"},
    {"type": "message", "user": "U0000003", "text": "Tests are passing!", "ts": "1720000020.000200"}
  ],
  "has_more": false
}

Create a conversation

Creates a new public or private channel in the workspace.

Parameters:

Name	Type	Required	Description
name	string	Yes	Name of the channel to create (lowercase, no spaces).
is_private	boolean	No	Set to true to create a private channel.

Returns: ConversationsCreateResponse|error

Sample code:

slack:ConversationsCreateResponse response = check slackClient->/conversations\.create.post({
    name: "project-phoenix",
    is_private: false
});

Sample response:

{
  "ok": true,
  "channel": {
    "id": "C0000NEW01",
    "name": "project-phoenix",
    "is_channel": true,
    "is_private": false,
    "created": 1720000000,
    "num_members": 1
  }
}

Get conversation info

Retrieves detailed information about a specific conversation.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID to retrieve information about.

Returns: ConversationsInfoResponse|error

Sample code:

slack:ConversationsInfoResponse response = check slackClient->/conversations\.info({
    channel: "C1234567890"
});

Sample response:

{
  "ok": true,
  "channel": {
    "id": "C1234567890",
    "name": "general",
    "is_channel": true,
    "is_private": false,
    "num_members": 42,
    "purpose": {"value": "Company-wide announcements and news"},
    "topic": {"value": "Q3 planning sprint"}
  }
}

Invite users to a conversation

Invites one or more users to join a channel.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID to invite users to.
users	string	Yes	Comma-separated list of user IDs to invite.

Returns: ConversationsInviteErrorResponse|error

Sample code:

slack:ConversationsInviteErrorResponse response = check slackClient->/conversations\.invite.post({
    channel: "C0000NEW01",
    users: "U0000001,U0000002,U0000003"
});

Sample response:

{
  "ok": true,
  "channel": {
    "id": "C0000NEW01",
    "name": "project-phoenix",
    "num_members": 4
  }
}

Get conversation members

Retrieves the list of member user IDs for a conversation.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID to retrieve members from.
limit	int	No	Maximum number of members to return per page.
cursor	string	No	Pagination cursor.

Returns: ConversationsMembersResponse|error

Sample code:

slack:ConversationsMembersResponse response = check slackClient->/conversations\.members({
    channel: "C1234567890",
    limit: 50
});

Sample response:

{
  "ok": true,
  "members": ["U0000001", "U0000002", "U0000003", "U0000BOT"],
  "response_metadata": {"next_cursor": ""}
}

Set conversation topic

Sets the topic for a conversation.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID.
topic	string	Yes	New topic text.

Returns: ConversationsSetTopicResponse|error

Sample code:

slack:ConversationsSetTopicResponse response = check slackClient->/conversations\.setTopic.post({
    channel: "C1234567890",
    topic: "Q3 sprint: focus on performance improvements"
});

Sample response:

{
  "ok": true,
  "channel": {
    "id": "C1234567890",
    "topic": {
      "value": "Q3 sprint: focus on performance improvements",
      "creator": "U0000BOT",
      "last_set": 1720000000
    }
  }
}

Archive a conversation

Archives a conversation so it can no longer receive messages.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID to archive.

Returns: ConversationsArchiveResponse|error

Sample code:

slack:ConversationsArchiveResponse response = check slackClient->/conversations\.archive.post({
    channel: "C0000OLD01"
});

Sample response:

{"ok": true}

Users

List all users in the workspace

Returns a list of all users in the workspace, including deactivated accounts.

Parameters:

Name	Type	Required	Description
limit	int	No	Maximum number of users to return per page.
cursor	string	No	Pagination cursor.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/users\.list({limit: 100});

Sample response:

{
  "ok": true,
  "members": [
    {"id": "U0000001", "name": "alice", "real_name": "Alice Smith", "is_bot": false, "deleted": false},
    {"id": "U0000002", "name": "bob", "real_name": "Bob Jones", "is_bot": false, "deleted": false},
    {"id": "U0000BOT", "name": "ballerina-bot", "real_name": "Ballerina Bot", "is_bot": true, "deleted": false}
  ],
  "response_metadata": {"next_cursor": ""}
}

Get user info

Retrieves detailed information about a specific user.

Parameters:

Name	Type	Required	Description
user	string	Yes	User ID to retrieve.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/users\.info({user: "U0000001"});

Sample response:

{
  "ok": true,
  "user": {
    "id": "U0000001",
    "name": "alice",
    "real_name": "Alice Smith",
    "is_bot": false,
    "profile": {
      "email": "[email protected]",
      "display_name": "Alice",
      "title": "Senior Software Engineer",
      "phone": "+1-555-0100"
    }
  }
}

Get user presence

Gets the current presence status of a user.

Parameters:

Name	Type	Required	Description
user	string	Yes	User ID to check presence for.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/users\.getPresence({user: "U0000001"});

Sample response:

{
  "ok": true,
  "presence": "active",
  "online": true,
  "auto_away": false,
  "manual_away": false,
  "connection_count": 1,
  "last_activity": 1720000000
}

Get conversations for a user

Lists all conversations the calling user or a specified user may access.

Parameters:

Name	Type	Required	Description
user	string	No	User ID whose conversations to list. Defaults to the authenticated user.
types	string	No	Comma-separated list of channel types: public_channel, private_channel, mpim, im.
limit	int	No	Maximum number of conversations to return.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/users\.conversations({
    user: "U0000001",
    types: "public_channel,private_channel"
});

Sample response:

{
  "ok": true,
  "channels": [
    {"id": "C1234567890", "name": "general"},
    {"id": "C0987654321", "name": "team-dev"},
    {"id": "C0000NEW01", "name": "project-phoenix"}
  ],
  "response_metadata": {"next_cursor": ""}
}

Files

Upload a file

Uploads a file to Slack and optionally shares it to one or more channels.

Parameters:

Name	Type	Required	Description
channels	string	No	Comma-separated list of channel IDs to share the file to.
content	string	No	File content as a string (for text-based files).
filename	string	No	Name of the file.
title	string	No	Title of the file displayed in Slack.
initial_comment	string	No	Message text to post alongside the file.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/files\.upload.post({
    channels: "C1234567890",
    content: "Server: api-prod\nStatus: OK\nUptime: 99.98%",
    filename: "health-report.txt",
    title: "Daily Health Report",
    initial_comment: "Automated health check results for today."
});

Sample response:

{
  "ok": true,
  "file": {
    "id": "F0000FILE1",
    "name": "health-report.txt",
    "title": "Daily Health Report",
    "filetype": "text",
    "size": 45,
    "url_private": "https://files.slack.com/files-pri/T0001/F0000FILE1/health-report.txt",
    "permalink": "https://myworkspace.slack.com/files/U0000BOT/F0000FILE1/health-report.txt"
  }
}

List files

Returns a list of files within the workspace, optionally filtered by channel or user.

Parameters:

Name	Type	Required	Description
channel	string	No	Filter files shared in this channel ID.
user	string	No	Filter files uploaded by this user ID.
count	int	No	Number of files to return per page.
types	string	No	Filter by file types (e.g., images, pdfs, snippets, spaces).

Returns: FilesListResponse|error

Sample code:

slack:FilesListResponse response = check slackClient->/files\.list({
    channel: "C1234567890",
    count: 20
});

Sample response:

{
  "ok": true,
  "files": [
    {"id": "F0000FILE1", "name": "health-report.txt", "title": "Daily Health Report", "filetype": "text", "size": 45},
    {"id": "F0000FILE2", "name": "architecture.png", "title": "System Architecture", "filetype": "png", "size": 204800}
  ],
  "paging": {"count": 20, "total": 2, "page": 1, "pages": 1}
}

Get file info

Gets detailed information about a specific file.

Parameters:

Name	Type	Required	Description
file	string	Yes	File ID to retrieve.

Returns: FilesInfoResponse|error

Sample code:

slack:FilesInfoResponse response = check slackClient->/files\.info({file: "F0000FILE1"});

Sample response:

{
  "ok": true,
  "file": {
    "id": "F0000FILE1",
    "name": "health-report.txt",
    "title": "Daily Health Report",
    "filetype": "text",
    "size": 45,
    "created": 1720000000,
    "url_private": "https://files.slack.com/files-pri/T0001/F0000FILE1/health-report.txt",
    "channels": ["C1234567890"]
  }
}

Delete a file

Deletes a file from Slack.

Parameters:

Name	Type	Required	Description
file	string	Yes	File ID to delete.

Returns: FilesDeleteResponse|error

Sample code:

slack:FilesDeleteResponse response = check slackClient->/files\.delete.post({
    file: "F0000FILE1"
});

Sample response:

{"ok": true}

Search

Search messages

Searches for messages matching a query string across the workspace.

Parameters:

Name	Type	Required	Description
query	string	Yes	Search query string. Supports Slack's search modifiers (e.g., in:#channel, from:@user).
count	int	No	Number of results per page.
page	int	No	Page number of results.
sort	string	No	Sort results by score (relevance) or timestamp.
sort_dir	string	No	Sort direction: asc or desc.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/search\.messages({
    query: "deployment failed in:#alerts",
    count: 10,
    sort: "timestamp",
    sort_dir: "desc"
});

Sample response:

{
  "ok": true,
  "messages": {
    "total": 2,
    "pagination": {"total_count": 2, "page": 1, "per_page": 10, "page_count": 1},
    "matches": [
      {
        "type": "message",
        "text": "deployment failed on prod: rolling back now",
        "channel": {"id": "C1234567890", "name": "alerts"},
        "ts": "1720000000.000100",
        "username": "alice"
      }
    ]
  }
}

Search files

Searches for files matching a query string across the workspace.

Parameters:

Name	Type	Required	Description
query	string	Yes	Search query string.
count	int	No	Number of results per page.
page	int	No	Page number.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/search\.files({
    query: "Q3 report",
    count: 10
});

Sample response:

{
  "ok": true,
  "files": {
    "total": 1,
    "matches": [
      {"id": "F0000FILE1", "name": "q3-report.txt", "title": "Q3 Revenue Report", "filetype": "text", "size": 1024}
    ],
    "pagination": {"total_count": 1, "page": 1}
  }
}

Reactions

Add a reaction to a message

Adds an emoji reaction to a message.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID containing the message.
name	string	Yes	Emoji name without surrounding colons (e.g., "thumbsup", "tada").
timestamp	string	Yes	Timestamp of the message to react to.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/reactions\.add.post({
    channel: "C1234567890",
    name: "white_check_mark",
    timestamp: "1720000000.123456"
});

Sample response:

{"ok": true}

Remove a reaction from a message

Removes an emoji reaction previously added to a message.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID containing the message.
name	string	Yes	Emoji name to remove.
timestamp	string	Yes	Timestamp of the reacted message.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/reactions\.remove.post({
    channel: "C1234567890",
    name: "white_check_mark",
    timestamp: "1720000000.123456"
});

Sample response:

{"ok": true}

Get reactions on a message

Gets all emoji reactions for a specified message.

Parameters:

Name	Type	Required	Description
channel	string	No	Channel ID (required when retrieving reactions on a message).
timestamp	string	No	Message timestamp.
file	string	No	File ID (use instead of channel and timestamp for file reactions).

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/reactions\.get({
    channel: "C1234567890",
    timestamp: "1720000000.123456"
});

Sample response:

{
  "ok": true,
  "type": "message",
  "message": {
    "text": "Deployment complete!",
    "ts": "1720000000.123456",
    "reactions": [
      {"name": "white_check_mark", "count": 5, "users": ["U0000001", "U0000002", "U0000003"]},
      {"name": "tada", "count": 2, "users": ["U0000001", "U0000002"]}
    ]
  }
}

Pins

Pin a message to a channel

Pins a message to a channel for quick reference.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID where the item will be pinned.
timestamp	string	No	Timestamp of the message to pin.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/pins\.add.post({
    channel: "C1234567890",
    timestamp: "1720000000.123456"
});

Sample response:

{"ok": true}

List pinned items in a channel

Lists all items pinned to a channel.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID to list pinned items from.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/pins\.list({channel: "C1234567890"});

Sample response:

{
  "ok": true,
  "items": [
    {
      "type": "message",
      "message": {
        "text": "Team processes and guidelines: see wiki link in description",
        "ts": "1720000000.123456",
        "user": "U0000001"
      },
      "channel": "C1234567890",
      "created": 1720000100,
      "created_by": "U0000001"
    }
  ]
}

Unpin an item from a channel

Removes a pinned item from a channel.

Parameters:

Name	Type	Required	Description
channel	string	Yes	Channel ID.
timestamp	string	No	Timestamp of the message to unpin.

Returns: DefaultSuccessResponse|error

Sample code:

slack:DefaultSuccessResponse response = check slackClient->/pins\.remove.post({
    channel: "C1234567890",
    timestamp: "1720000000.123456"
});

Sample response:

{"ok": true}

Auth & API

Test authentication

Verifies the authentication token and returns information about the authenticated user and workspace.

Returns: AuthTestResponse|error

Sample code:

slack:AuthTestResponse response = check slackClient->/auth\.test();

Sample response:

{
  "ok": true,
  "url": "https://myworkspace.slack.com/",
  "team": "My Workspace",
  "user": "ballerina-bot",
  "team_id": "T0000001",
  "user_id": "U0000BOT",
  "bot_id": "B0000001",
  "is_enterprise_install": false
}

Revoke an access token

Revokes an access token, invalidating it for future API calls.

Parameters:

Name	Type	Required	Description
test	boolean	No	Set to true for a dry run: the token is not actually revoked.

Returns: AuthRevokeResponse|error

Sample code:

slack:AuthRevokeResponse response = check slackClient->/auth\.revoke();

Sample response:

{"ok": true, "revoked": true}

Get bot info

Gets information about a bot user associated with the workspace.

Parameters:

Name	Type	Required	Description
bot	string	No	Bot ID to retrieve. Defaults to the bot associated with the current token.

Returns: BotsInfoResponse|error

Sample code:

slack:BotsInfoResponse response = check slackClient->/bots\.info();

Sample response:

{
  "ok": true,
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