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Category: Communication Type: Utility

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Overview

The Send Slack Message node posts messages to Slack via an incoming webhook. Use it to notify channels about events, errors, or summaries.

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Description

Provide a Slack webhook URL and message content. Optionally pass blocks/attachments as JSON-encoded strings for rich formatting.

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Input Parameters

  • webhookUrl Slack incoming webhook URL.
  • username Optional display name to show as the message sender.
  • message Main text content.
  • attachments JSON-encoded Slack blocks/attachments for rich messages.
Notes:
  • Provide flat key-value pairs; use JSON-encoded strings for complex fields.

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Output Parameters

  • deliveryTime ISO timestamp of request completion.
  • deliveryStatus success or failed.
  • responseStatus HTTP status code.

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Output Type

Output Type: JSON

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Example Usage

Input: 
{
  "webhookUrl": "https://hooks.slack.com/services/...",
  "username": "Notifier Bot",
  "message": "Daily report is ready.",
  "attachments": "{\"blocks\":[{\"type\":\"section\",\"text\":{\"type\":\"mrkdwn\",\"text\":\"*Summary:* All systems operational.\"}}]}"
}
Expected Output: 
{
  "deliveryStatus": "success",
  "responseStatus": 200
}

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How to Use in a No-Code Workflow

  1. Add the Node Place the Send Slack Message node in your notification flow.
  2. Map Inputs Provide webhookUrl and message, optionally pass blocks/attachments.
  3. Check Outputs Confirm deliveryStatus and responseStatus.

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Best Practices

  • Prefer blocks for structured messages.
  • Do not include secrets in payloads.
  • Consider channel-specific webhooks for access control.

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Common Errors

  • “invalid_payload” Ensure your JSON matches Slack’s schema.
  • “channel_not_found” Check webhook permissions and channel name.

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Create a Slack webhook URL

  • Visit the Slack API website at https://api.slack.com/.
  • Click on “Create New App” and select “From scratch.”
  • Give your app a name and select the workspace where you want to install it.
  • In the app settings, find the “Incoming Webhooks” section and toggle it on to enable it.
  • Click on “Add New Webhook to Workspace.”
  • Select the channel where the webhook will post messages and authorize the app.
  • After authorization, you’ll be redirected back to the app settings where the new webhook URL will be displayed.
  • Copy this webhook URL to use it for sending messages to the selected Slack channel.