Post Message to Slack via Webhook

The workflow JSON

Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →

{
  "name": "Post Message to Slack",
  "nodes": [
    {
      "parameters": {
        "authentication": "oAuth2",
        "select": "channel",
        "channelId": {
          "__rl": true,
          "value": "C083QQBQTAM",
          "mode": "list",
          "cachedResultName": "flowise-n8n"
        },
        "text": "={{ $json.body.message }}",
        "otherOptions": {
          "includeLinkToWorkflow": false
        }
      },
      "id": "4882859e-bf35-475b-9fd2-a068ac4fc602",
      "name": "Slack",
      "type": "n8n-nodes-base.slack",
      "typeVersion": 2.2,
      "position": [
        1040,
        360
      ],
      "credentials": {
        "slackOAuth2Api": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "options": {}
      },
      "id": "a9e7aa8a-04ba-4dc6-8a14-f2c435df4ad8",
      "name": "Respond to Webhook",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "position": [
        1260,
        360
      ]
    },
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "f17f77e5-51dc-4589-8b51-4c8adc23c3c0",
        "authentication": "headerAuth",
        "responseMode": "responseNode",
        "options": {}
      },
      "id": "db4d3557-e423-43e9-8f0c-b4309f304567",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "position": [
        820,
        360
      ],
      "credentials": {
        "httpHeaderAuth": {
          "name": "<your credential>"
        }
      }
    }
  ],
  "connections": {
    "Slack": {
      "main": [
        [
          {
            "node": "Respond to Webhook",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Webhook": {
      "main": [
        [
          {
            "node": "Slack",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": true,
  "settings": {
    "executionOrder": "v1"
  },
  "versionId": "74bd88b9-5eb7-4a1a-8bc3-be2636a3639c",
  "meta": {
    "templateCredsSetupCompleted": true
  },
  "id": "dBTFcNDVqjuQ619T",
  "tags": []
}

Credentials you'll need

Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.

• httpHeaderAuth
• slackOAuth2Api

About this workflow

Post Message to Slack. Uses slack, respondToWebhook. Webhook trigger; 3 nodes.

Source: https://github.com/daboi2331/ai-agents-masterclass/blob/main/local-ai-packaged/n8n-tool-workflows/Post_Message_to_Slack.json — original creator credit. Request a take-down →

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