Slack Message is a Step (action) in Messaging › Social. Posts a message to Slack (mrkdwn, not HTML).
Slack Message is a Step (action) in Messaging › Social. Posts a message to Slack (mrkdwn, not HTML).
When the flow reaches this step, JOrchestrator executes Slack Message against your linked site or an external integration, using the field values you set on General and Design. Downstream steps can read the output payload fields defined for this node.
Slack Message is a action step in the Messaging › Social group. Action steps run in the middle or end of a flow. They perform work on your CMS, call external services, or transform data for the next step.
Typical reasons teams add Slack Message to a flow:
Common patterns on the canvas:
Bot token and default channel from Node Configuration → Slack. Optional image via public https URL or data:image/base64 from upstream.
Invite the bot to the channel before posting to private channels.
The designer shows these tabs for this node:
| Tab | Purpose |
|---|---|
| Info | Plain-language description and output payload fields for downstream steps |
| General | Canvas label and read-only node ID |
| AI | Optional assistant to help draft settings from plain language |
| Design | Node-specific configuration fields |
These fields are managed by the designer or runtime — you do not type into them directly:
| Property key | Label | Type | Required | Visible when | Notes |
|---|---|---|---|---|---|
_nodeId | Node ID | node-id | No | — | — |
_payloadFields | Available Fields | payload-panel | No | — | — |
| Property key | Label | Type | Required | Visible when | Notes |
|---|---|---|---|---|---|
label | Label | text | No | — | Node label |
| Property key | Label | Type | Required | Visible when | Notes |
|---|---|---|---|---|---|
channel | Channel (optional) | payload-text | No | — | #general or C0123456789 — uses Joomla Node Configuration → Slack default if empty |
text | Message | textarea | Yes | — | Slack mrkdwn (bold, _italic_, <url|label>) — not HTML |
useMrkdwn | Format as mrkdwn | select (true | false; default: true) | No | — | When enabled, Message uses Slack mrkdwn. Disable for plain text only. |
imageUrl | Image (optional) | textarea | No | — | https://… or data:image/png;base64,… or {{node.field}} Public https URL (Block Kit), or inline data:image/*;base64,… / raw base64 (uploaded via Slack files API). Max ~10 MB. |
imageAlt | Image alt text (optional) | payload-text | No | — | Short description for accessibility |
threadTs | Thread TS (optional) | payload-text | No | — | Reply in thread (parent message timestamp) |
Credentials, API keys, mailers, SMTP, and integration defaults are configured in the CMS plugin under Node Configuration, not per step on this node. Link the flow to a domain before testing CMS-backed fields.
After this step runs, later nodes can reference these fields using placeholders such as {{slack_message.success}}.
| Field key | Type | Description |
|---|---|---|
success | boolean | Whether the operation completed successfully. |
channel | string | Slack channel ID or name. |
ts | string | Slack message timestamp identifier. |
fileId | string | Slack uploaded file ID. |
imageDelivery | string | How the image was delivered in Slack. |
usedBlocks | boolean | Whether Block Kit blocks were used. |
imageUrl | string | Image URL used in the Slack message. |
message | string | Human-readable status, error, or result summary. |
text) must be filled before the flow can be saved.Other steps in the same area of the palette:
discord-message) — Messaging › Socialwhatsapp-business-message) — Messaging › Social