Slack

Manage Slack channels, messages, files, reactions, stars, users, and user groups

Overview

The Slack tool provides comprehensive Slack workspace management: send, update, delete and search messages; manage channels (create, archive, rename, invite, kick, get history, get thread replies); upload files and read file metadata; add and remove reactions; manage stars; get user info and presence; update user profiles; and manage user groups. File upload consumes binary data from the incoming item. Every operation authenticates with a Slack bearer token.

Category: Communication
Tool Name: slack
Version: 1

Appearance: Icon: lucide-MessageSquare | Color: #4A154B

Node Type

Action (Binary) — handles file/binary data operations

Input / Output

Direction	Port(s)
Input	Input
Output	Output, Error

Credentials

This tool requires Slack API credentials. See the Credentials Guide for setup instructions.

Resources

Resource	Value
Channel	channel
File	file
Message	message
Reaction	reaction
Star	star
User	user
User Group	userGroup

Operations

Each resource has its own operation list. Select the resource first; the Operation dropdown then offers only that resource’s operations.

Operation	Value	Description
Channel: Archive	archive	Archive a channel
Channel: Close	close	Close a conversation
Channel: Create	create	Create a new channel
Channel: Get	get	Get one channel’s details
Channel: Get Many	getAll	List the workspace’s channels
Channel: History	history	Read a channel’s message history
Channel: Invite	invite	Invite users to a channel
Channel: Join	join	Join a channel
Channel: Kick	kick	Remove a user from a channel
Channel: Leave	leave	Leave a channel
Channel: Member	member	List a channel’s members
Channel: Open	open	Open or resume a direct message conversation
Channel: Rename	rename	Rename a channel
Channel: Replies	replies	Read the replies in a message thread
Channel: Set Purpose	setPurpose	Set a channel’s purpose
Channel: Set Topic	setTopic	Set a channel’s topic
Channel: Unarchive	unarchive	Restore an archived channel
File: Get	get	Get one file’s metadata
File: Get Many	getAll	List files
File: Upload	upload	Upload binary data from the item as a file
Message: Delete	delete	Delete a message
Message: Get Permalink	getPermalink	Get a permanent link to a message
Message: Search	search	Search messages across the workspace
Message: Send	post	Send a message to a channel or a user
Message: Update	update	Edit an existing message
Reaction: Add	add	Add an emoji reaction to a message
Reaction: Get	get	Read the reactions on a message
Reaction: Remove	remove	Remove an emoji reaction from a message
Star: Add	add	Star a message or a file
Star: Delete	delete	Remove a star
Star: Get Many	getAll	List starred items
User: Get	info	Get one user’s details
User: Get Many	getAll	List the workspace’s users
User: Get User’s Profile	getProfile	Read a user’s profile fields
User: Get User’s Status	getPresence	Read a user’s presence
User: Update User’s Profile	updateProfile	Update a user’s profile fields
User Group: Add Users	updateUsers	Add users to a user group
User Group: Create	create	Create a user group
User Group: Disable	disable	Disable a user group
User Group: Enable	enable	Re-enable a disabled user group
User Group: Get Many	getAll	List user groups
User Group: Get Users	getUsers	List a user group’s members
User Group: Update	update	Update a user group’s details

Parameters

Several parameters share a display name but use different internal names — the internal name is shown in backticks so you can copy the right key into a JSON config or an expression.

Channel: Archive

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.

Channel: Close

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.

Channel: Create

Parameter	Type	Required	Default	Description
Channel Name (channelId)	string	Yes	—	Name of the channel to create. Leading # is stripped automatically.
Channel Visibility	options	No	public	Whether the new channel is open to the workspace or invite-only.
				Options: public, private

Channel: Get

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.

Channel: Get Many

Parameter	Type	Required	Default	Description
Return All	boolean	No	false	Whether to return all results or only up to a given limit.
Limit	number	No	50	Maximum number of channels to return (1–1000). (shown when Return All is false)
Filters	collection	No	{}	Narrow the channel listing.
— Types	multiOptions	No	[]	Which conversation types to include.
				Options: public_channel, private_channel, im (one-to-one direct messages), mpim (group direct messages)
— Exclude Archived	boolean	No	false	Leave archived channels out of the results.

Channel: History

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.
Return All	boolean	No	false	Whether to return all results or only up to a given limit.
Limit	number	No	50	Maximum number of messages to return (1–1000). (shown when Return All is false)
Filters	collection	No	{}	Restrict the history to a time window.
— Inclusive	boolean	No	false	Include messages that sit exactly on the Latest or Oldest boundary.
— Latest	string	No	—	ISO datetime or Unix timestamp (latest boundary).
— Oldest	string	No	—	ISO datetime or Unix timestamp (oldest boundary).

Channel: Invite

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.
User IDs (userIds)	string	Yes	—	Comma-separated user IDs to invite to the channel.

Channel: Join

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.

Channel: Kick

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.
User ID (userId)	string	Yes	—	The user ID to kick from the channel.

Channel: Leave

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.

Channel: Member

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.
Return All	boolean	No	false	Whether to return all results or only up to a given limit.
Limit	number	No	50	Maximum number of members to return (1–1000). (shown when Return All is false)
Resolve Data	boolean	No	false	Whether to resolve member IDs to full user objects.

Channel: Open

Parameter	Type	Required	Default	Description
Options (options)	collection	No	{}	How to open the conversation.
— Channel ID	string	No	—	Resume a conversation by channel ID.
— Return IM	boolean	No	false	Return the full direct-message object rather than just its ID.
— Users	string	No	—	Comma-separated user IDs to open a DM with.

Channel: Rename

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.
New Name (name)	string	Yes	—	New name for the channel.

Channel: Replies

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.
Thread Timestamp (ts)	string	Yes	—	Timestamp of the parent message to get replies for.
Return All	boolean	No	false	Whether to return all results or only up to a given limit.
Limit	number	No	50	Maximum number of replies to return (1–1000). (shown when Return All is false)
Filters	collection	No	{}	Restrict the replies to a time window.
— Inclusive	boolean	No	false	Include replies that sit exactly on the Latest or Oldest boundary.
— Latest	string	No	—	Latest boundary of the reply window.
— Oldest	string	No	—	Oldest boundary of the reply window.

Channel: Set Purpose

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.
Purpose	string	Yes	—	The channel purpose to set. Supports expressions.

Channel: Set Topic

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.
Topic	string	Yes	—	The channel topic to set. Supports expressions.

Channel: Unarchive

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The ID of the Slack channel (e.g., C0123ABCDEF). You can also paste a Slack URL — the channel ID will be extracted. Supports expressions.

File: Get

Parameter	Type	Required	Default	Description
File ID	string	Yes	—	The ID of the file to look up. Supports expressions.

File: Get Many

Parameter	Type	Required	Default	Description
Return All	boolean	No	false	Whether to return all results or only up to a given limit.
Limit	number	No	50	Maximum number of files to return (1–100). (shown when Return All is false)
Filters	collection	No	{}	Narrow the file listing.
— Channel ID	string	No	—	Only list files shared in this channel.
— Show Files Hidden By Limit	boolean	No	false	Include files hidden by the workspace’s file limit.
— Timestamp From	string	No	—	Only list files created at or after this time.
— Timestamp To	string	No	—	Only list files created at or before this time.
— Types	multiOptions	No	["all"]	Which file types to include.
				Options: all, gdocs (Google Docs), images, pdfs, snippets, spaces, zips
— User ID	string	No	—	Only list files uploaded by this user.

File: Upload

Parameter	Type	Required	Default	Description
Binary Property	string	Yes	data	Name of the binary property which contains the data for the file to be uploaded. Names are case-sensitive — see the upstream node’s Binary Data panel for the exact names to use.
Options (options)	collection	No	{}	Where and how the file is shared.
— Channel ID	string	No	—	Channel to share the file in.
— File Name	string	No	—	Name to store the file under. Falls back to the binary property’s own file name.
— Initial Comment	string	No	—	Message text introducing the file.
— Thread Timestamp	string	No	—	Reply to a thread by providing the parent message timestamp.
— Title	string	No	—	Title shown above the file in Slack.

Message: Delete

Parameter	Type	Required	Default	Description
Send Message To (select)	options	Yes	channel	Whether the message lives in a channel or a direct message.
				Options: channel, user
Channel ID	string	Yes	—	The channel or conversation ID the message is in. (shown when Send Message To is channel)
User ID (user)	string	Yes	—	The user ID whose DM the message is in. Use format @username or a user ID like U0123ABC. (shown when Send Message To is user)
Message Timestamp (timestamp)	string	Yes	—	Timestamp (ts) of the message to update or delete.

Message: Get Permalink

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The channel the message is in. Supports expressions.
Message Timestamp (timestamp)	string	Yes	—	Timestamp (ts) of the message to link to.

Message: Search

Parameter	Type	Required	Default	Description
Query	string	Yes	—	Search query. Supports Slack search modifiers like in:#channel.
Sort	options	No	desc	The order results come back in.
				Options: relevance, desc (newest first), asc (oldest first)
Return All	boolean	No	false	Whether to return all matches or only up to a given limit.
Limit	number	No	50	Maximum number of matches to return (1–100). (shown when Return All is false)
Options (options)	collection	No	{}	Extra search scoping.
— Search in Channel Names	string	No	—	Comma-separated channel names to restrict the search to (appended as in:channel modifiers).

Message: Send

Parameter	Type	Required	Default	Description
Send Message To (select)	options	Yes	channel	Whether to post into a channel or send a direct message.
				Options: channel, user
Channel ID	string	Yes	—	The channel or conversation ID to send the message to. (shown when Send Message To is channel)
User ID (user)	string	Yes	—	The user ID to send a DM to. Use format @username or a user ID like U0123ABC. (shown when Send Message To is user)
Message Type	options	No	text	Which body format the message uses.
				Options: text, block (Block Kit), attachment (legacy attachments)
Text	string	No	—	The text content of the message. For Block Kit messages, this is the fallback text.
Blocks (JSON)	json	No	[]	Block Kit blocks as JSON array. See https://api.slack.com/block-kit (shown when Message Type is block)
Attachments (JSON)	json	No	[]	Legacy attachments as JSON array. (shown when Message Type is attachment)
Other Options	collection	No	{}	Threading, formatting and identity options.
— Send as User	string	No	—	Username to post as (requires accessToken auth, not OAuth2).
— Thread Timestamp	string	No	—	Timestamp of parent message to reply to.
— Reply Broadcast	boolean	No	false	Whether to also post the reply to the channel.
— Unfurl Links	boolean	No	false	Expand link previews in the message.
— Unfurl Media	boolean	No	true	Expand media previews in the message.
— Markdown	boolean	No	true	Render Slack markdown in the message text.
— Link Names	boolean	No	false	Turn @mentions and #channels into real links.
— Icon URL	string	No	—	Image URL to use as the sender’s avatar.
— Icon Emoji	string	No	—	Emoji code to use as the sender’s avatar.
— Ephemeral	boolean	No	false	Whether to send an ephemeral message (only visible to the specified user). When sending to a channel, you must also set Ephemeral User.
— Ephemeral User	string	No	—	User ID to show the ephemeral message to (required when sending ephemeral to a channel).

Message: Update

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The channel the message is in. Supports expressions.
Message Type	options	No	text	Which body format the replacement message uses.
				Options: text, block (Block Kit), attachment (legacy attachments)
Text	string	No	—	The text content of the message. For Block Kit messages, this is the fallback text.
Blocks (JSON)	json	No	[]	Block Kit blocks as JSON array. See https://api.slack.com/block-kit (shown when Message Type is block)
Attachments (JSON)	json	No	[]	Legacy attachments as JSON array. (shown when Message Type is attachment)
Message Timestamp (timestamp)	string	Yes	—	Timestamp (ts) of the message to update or delete.
Update Fields	collection	No	{}	Extra formatting applied to the edit.
— Link Names	boolean	No	false	Turn @mentions and #channels into real links.
— Parse	options	No	none	How Slack parses the message text.
				Options: client, full, none

Reaction: Add

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The channel the message is in. Supports expressions.
Message Timestamp (timestamp)	string	Yes	—	Timestamp (ts) of the message to react to, e.g. 1663233118.856619.
Emoji Code (name)	string	Yes	—	Emoji code (e.g., “+1”, “thumbsup”). Do not use actual emoji characters.

Reaction: Get

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The channel the message is in. Supports expressions.
Message Timestamp (timestamp)	string	Yes	—	Timestamp (ts) of the message to read reactions from, e.g. 1663233118.856619.

Reaction: Remove

Parameter	Type	Required	Default	Description
Channel ID	string	Yes	—	The channel the message is in. Supports expressions.
Message Timestamp (timestamp)	string	Yes	—	Timestamp (ts) of the message to remove the reaction from, e.g. 1663233118.856619.
Emoji Code (name)	string	Yes	—	Emoji code (e.g., “+1”, “thumbsup”). Do not use actual emoji characters.

Star: Add

Parameter	Type	Required	Default	Description
Item to Star (target)	options	Yes	message	Whether the star goes on a message or on a file.
				Options: message, file
Channel ID	string	Yes	—	The channel holding the item to star. Supports expressions.
File ID	string	No	—	The file to star. (shown when Item to Star is file)
Message Timestamp (timestamp)	string	No	—	Timestamp (ts) of the message to star, e.g. 1663233118.856619. (shown when Item to Star is message)
Options (options)	collection	No	{}	Additional star targets.
— File Comment	string	No	—	Star a comment on a file instead of the file itself.

Star: Delete

Parameter	Type	Required	Default	Description
Options (options)	collection	No	{}	Which star to remove — supply the same target you starred.
— Channel ID	string	No	—	The channel holding the starred item.
— File ID	string	No	—	The starred file.
— File Comment	string	No	—	The starred file comment.
— Message Timestamp	string	No	—	Timestamp (ts) of the starred message.

Star: Get Many

Parameter	Type	Required	Default	Description
Return All	boolean	No	false	Whether to return all starred items or only up to a given limit.
Limit	number	No	50	Maximum number of starred items to return (1–100). (shown when Return All is false)

User: Get

Parameter	Type	Required	Default	Description
User ID (user)	string	Yes	—	The user ID (e.g., U0123ABCDEF).

User: Get Many

Parameter	Type	Required	Default	Description
Return All	boolean	No	false	Whether to return all users or only up to a given limit.
Limit	number	No	50	Maximum number of users to return (1–200). (shown when Return All is false)

User: Get User’s Profile

Parameter	Type	Required	Default	Description
User ID (user)	string	Yes	—	The user ID (e.g., U0123ABCDEF).

User: Get User’s Status

Parameter	Type	Required	Default	Description
User ID (user)	string	Yes	—	The user ID (e.g., U0123ABCDEF).

User: Update User’s Profile

Parameter	Type	Required	Default	Description
Options (options)	collection	No	{}	The profile fields to write. Fields you leave out are not changed.
— Email	string	No	—	The profile email address.
— First Name	string	No	—	The profile first name.
— Last Name	string	No	—	The profile last name.
— Status Text	string	No	—	The custom status message.
— Status Emoji	string	No	—	Emoji code for status (e.g., :house_with_garden:).
— Status Expiration	string	No	—	ISO datetime for status expiration. Leave empty for no expiration.
— Custom Fields (JSON)	json	No	{}	Custom profile fields as JSON object: { “fieldId”: { “value”: ”…”, “alt”: ”…” } }
— User ID (Admin Only)	string	No	—	Set another user profile (admin only).

User Group: Add Users

Parameter	Type	Required	Default	Description
User Group ID	string	Yes	—	The ID of the user group to change. Supports expressions.
User IDs (users)	string	Yes	—	Comma-separated user IDs to add to the group. Existing members are preserved.
Options (options)	collection	No	{}	Extra response options.
— Include Count	boolean	No	false	Include the group’s user count in the result.

User Group: Create

Parameter	Type	Required	Default	Description
Group Name (name)	string	Yes	—	Name of the new user group. Supports expressions.
Options (Options)	collection	No	{}	Optional details for the new group. Note the capital O — the internal key is Options, not options.
— Channel IDs	string	No	—	Comma-separated channel IDs.
— Description	string	No	—	What the group is for.
— Handle	string	No	—	The @handle used to mention the group.
— Include Count	boolean	No	false	Include the group’s user count in the result.

User Group: Disable

Parameter	Type	Required	Default	Description
User Group ID	string	Yes	—	The ID of the user group to disable. Supports expressions.
Options (options)	collection	No	{}	Extra response options.
— Include Count	boolean	No	false	Include the group’s user count in the result.

User Group: Enable

Parameter	Type	Required	Default	Description
User Group ID	string	Yes	—	The ID of the user group to enable. Supports expressions.
Options (option)	collection	No	{}	Extra response options. Note the singular — the internal key is option, not options.
— Include Count	boolean	No	false	Include the group’s user count in the result.

User Group: Get Many

Parameter	Type	Required	Default	Description
Return All	boolean	No	false	Whether to return all user groups or only up to a given limit.
Limit	number	No	50	Maximum number of user groups to return (1–200). (shown when Return All is false)
Options (options)	collection	No	{}	What each returned group includes.
— Include Count	boolean	No	false	Include each group’s user count.
— Include Disabled	boolean	No	false	Include disabled groups in the listing.
— Include Users	boolean	No	false	Include each group’s member list.

User Group: Get Users

Parameter	Type	Required	Default	Description
User Group ID	string	Yes	—	The ID of the user group to read. Supports expressions.
Options (options)	collection	No	{}	How much detail to return per member.
— Resolve Data	boolean	No	true	Whether to fetch full user objects instead of just user IDs.

User Group: Update

Parameter	Type	Required	Default	Description
User Group ID	string	Yes	—	The ID of the user group to update. Supports expressions.
Update Fields	collection	No	{}	The group fields to write. Fields you leave out are not changed.
— Channels	string	No	—	Comma-separated channel IDs.
— Description	string	No	—	What the group is for.
— Handle	string	No	—	The @handle used to mention the group.
— Include Count	boolean	No	false	Include the group’s user count in the result.
— Name	string	No	—	New name for the group.

All Operations

Parameter	Type	Required	Default	Description
Max Concurrency	number	No	5	Maximum number of items to process concurrently. Keep low due to Slack rate limits.

Output Data

The Slack object returned by the API becomes the output item’s JSON — the incoming item’s JSON does not pass through, so read any upstream field you still need before this node. Binary data on the input item is forwarded unchanged; the node never produces new binary data, so File: Get returns the file’s metadata rather than its contents.

Most operations unwrap the API envelope for you, so the item is the object itself: Channel operations put the channel object on the item, User: Get puts the user object, User: Get User’s Profile and User: Update User’s Profile put the profile object, and the User Group operations put the user-group object. Reference the fields directly, e.g. {{ $json.id }} or {{ $json.name }}.

A returned message timestamp arrives as message_timestamp, not ts. Where the API answers with a top-level ts — Message: Send is the common case — the node renames it, so chain a follow-up node with {{ $json.message_timestamp }} to react to, update, thread under or delete the message you just sent. Records inside a fanned-out list keep their own ts field; the rename only touches the top level of a single response.

Operations that fan out. These return a list and emit one output item per record rather than one per input item:

Operation	One item per
Channel: Get Many	channel
Channel: History	message
Channel: Member	member — { "member": "U0123ABC" } per member, or a full user object when Resolve Data is on
Channel: Replies	reply message
File: Get Many	file
File: Upload	uploaded file object
Message: Search	matching message
Star: Get Many	starred item
User: Get Many	user
User Group: Get Many	user group
User Group: Get Users	member — a full user object by default, or { "id": "U0123ABC" } when Resolve Data is off

When one of these returns nothing, that input item produces no output items at all — the branch downstream simply receives fewer items. Guard against an empty branch rather than expecting an empty-array item.

With Return All off, the Limit applies to the number of records fetched; with it on, the node pages through the whole result set, which is where Slack’s rate limits bite hardest.

Failures follow the node’s error mode: in errorPort mode the failed item is routed to the Error output carrying an _error object, with the input item’s binary still attached.

Usage Examples

• Send a message to a Slack channel
• Upload a file to Slack
• Get file info from Slack
• Search Slack messages
• Add a reaction to a message
• Create a Slack channel
• Get channel history
• List channel members
• Get user info
• Update user profile status
• Create a user group
• Add users to a user group

Example Configuration

Send a plain text message to a channel:

{
  "type": "slack",
  "parameters": {
    "resource": "message",
    "operation": "post",
    "select": "channel",
    "channelId": "C1234567890",
    "messageType": "text",
    "text": "Deployment {{ $json.version }} finished at {{ $datetime.iso }}"
  }
}

Reply inside an existing thread — a preceding Slack node’s message_timestamp is the parent:

{
  "type": "slack",
  "parameters": {
    "resource": "message",
    "operation": "post",
    "select": "channel",
    "channelId": "C1234567890",
    "messageType": "text",
    "text": "{{ $json.summary }}",
    "otherOptions": {
      "threadTs": "{{ $json.message_timestamp }}",
      "replyBroadcast": false,
      "link_names": true
    }
  }
}

Send a Block Kit message, keeping Text as the notification fallback:

{
  "type": "slack",
  "parameters": {
    "resource": "message",
    "operation": "post",
    "select": "channel",
    "channelId": "C1234567890",
    "messageType": "block",
    "text": "Build failed",
    "blocksJson": "[{\"type\":\"section\",\"text\":{\"type\":\"mrkdwn\",\"text\":\"*Build failed* on branch {{ $json.branch }}\"}}]"
  }
}

Create a private channel:

{
  "type": "slack",
  "parameters": {
    "resource": "channel",
    "operation": "create",
    "channelId": "{{ $json.projectSlug }}",
    "channelVisibility": "private"
  }
}

Read the last 100 messages of a channel within a time window — this emits one item per message:

{
  "type": "slack",
  "parameters": {
    "resource": "channel",
    "operation": "history",
    "channelId": "C1234567890",
    "returnAll": false,
    "limit": 100,
    "filters": {
      "oldest": "{{ $json.since }}",
      "inclusive": true
    }
  }
}

Upload a file produced by an upstream node and announce it in a channel:

{
  "type": "slack",
  "parameters": {
    "resource": "file",
    "operation": "upload",
    "binaryPropertyName": "data",
    "options": {
      "channelId": "C1234567890",
      "fileName": "{{ $json.reportName }}.pdf",
      "initialComment": "Weekly report",
      "title": "Weekly report"
    }
  }
}

React to a message with an emoji code — never a literal emoji character:

{
  "type": "slack",
  "parameters": {
    "resource": "reaction",
    "operation": "add",
    "channelId": "{{ $json.channel }}",
    "timestamp": "{{ $json.ts }}",
    "name": "white_check_mark"
  }
}

Search messages and cap the result set:

{
  "type": "slack",
  "parameters": {
    "resource": "message",
    "operation": "search",
    "query": "project deadline in:#general",
    "sort": "desc",
    "returnAll": false,
    "limit": 20
  }
}

Create a user group — note the capital Options key this operation uses:

{
  "type": "slack",
  "parameters": {
    "resource": "userGroup",
    "operation": "create",
    "name": "Engineering Team",
    "Options": {
      "handle": "engineering",
      "description": "All engineering team members",
      "channelIds": "C1234567890,C0987654321",
      "include_count": true
    }
  }
}

Add users to that group:

{
  "type": "slack",
  "parameters": {
    "resource": "userGroup",
    "operation": "updateUsers",
    "userGroupId": "S1234567890",
    "users": "{{ $json.memberIds }}"
  }
}

Set a user’s status:

{
  "type": "slack",
  "parameters": {
    "resource": "user",
    "operation": "updateProfile",
    "options": {
      "status_text": "In a meeting",
      "status_emoji": ":calendar:",
      "status_expiration": "{{ $json.endsAt }}"
    }
  }
}

Error Handling

Mode	Behavior
stop	Halts workflow on first error
continue	Skips failed items, passes successful ones through
errorPort	Routes failed items to Error output port

Tips

Manage Slack channels, messages, files, reactions, stars, users, and user groups via the Slack Web API. File upload reads binary data; file download produces file metadata.

Notes

• Keep Max Concurrency low. Slack rate-limits aggressively per method, and the node fires one request per item. The default of 5 is a deliberate ceiling, not a starting point to raise.
• Three parameters share the display name “Options” but not the same key. User Group: Create uses Options (capital O) and User Group: Enable uses option (singular); everywhere else it is options. Copy the key shown in the Parameter column.
• Emoji reactions take a code, not a character. Use thumbsup or +1, not the emoji itself.
• Channel ID accepts a pasted Slack URL — the ID is extracted for you. On Channel: Create the same channelId key holds the new channel’s name, not an ID.
• Message Type decides which body field is read. text uses Text alone, block reads Blocks (JSON), and attachment reads Attachments (JSON); with Block Kit, Text is still worth filling in as the notification fallback.
• Send as User needs token-based auth, so it does nothing on an OAuth2 credential.
• The item JSON is replaced, not merged. Unlike most nodes, Slack puts the API object on the item by itself. If a downstream node needs an upstream field, capture it before the Slack node or re-attach it afterwards.