Forward Slack Channel Messages to Whatsapp with Moltflow

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 →

{
  "meta": {
    "templateCredsSetupCompleted": true
  },
  "name": "Forward Slack Channel Messages to WhatsApp with MoltFlow",
  "tags": [
    {
      "name": "whatsapp"
    },
    {
      "name": "slack"
    },
    {
      "name": "notifications"
    },
    {
      "name": "moltflow"
    },
    {
      "name": "team"
    }
  ],
  "nodes": [
    {
      "id": "k1000001-0000-4000-0b00-000000000010",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -40,
        -300
      ],
      "parameters": {
        "color": 4,
        "width": 400,
        "height": 300,
        "content": "## Slack \u2192 WhatsApp Forwarder\nForward important Slack messages to WhatsApp so you never miss critical updates, powered by [MoltFlow](https://molt.waiflow.app).\n\n**How it works:**\n1. Slack sends a webhook when a message is posted in a channel\n2. The message text and sender are extracted\n3. A formatted message is forwarded to your WhatsApp number\n4. Stay on top of Slack without checking the app"
      },
      "typeVersion": 1
    },
    {
      "id": "k1000001-0000-4000-0b00-000000000011",
      "name": "Sticky Note1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        420,
        -300
      ],
      "parameters": {
        "color": 5,
        "width": 400,
        "height": 260,
        "content": "## Setup (5 min)\n1. Create a [MoltFlow account](https://molt.waiflow.app) and connect WhatsApp\n2. Activate this workflow \u2014 copy the webhook URL\n3. In Slack \u2192 Apps \u2192 Incoming Webhooks (or use Slack API), configure an outgoing webhook to this n8n URL\n4. Set `YOUR_SESSION_ID` and `YOUR_PHONE` in the Format Message node\n5. Add MoltFlow API Key: Header Auth \u2192 `X-API-Key`\n\n**Tip:** Filter by channel or keywords in the code node"
      },
      "typeVersion": 1
    },
    {
      "id": "k1000001-0000-4000-0b00-000000000001",
      "name": "Slack Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        0,
        0
      ],
      "parameters": {
        "path": "slack-forward",
        "options": {},
        "httpMethod": "POST"
      },
      "typeVersion": 2
    },
    {
      "id": "k1000001-0000-4000-0b00-000000000002",
      "name": "Format Message",
      "type": "n8n-nodes-base.code",
      "position": [
        220,
        0
      ],
      "parameters": {
        "mode": "runOnceForAllItems",
        "jsCode": "const SESSION_ID = 'YOUR_SESSION_ID';\nconst MY_PHONE = 'YOUR_PHONE';\n\nconst body = $input.first().json.body || $input.first().json;\n\nif (body.challenge) {\n  return [{ json: { challenge: body.challenge } }];\n}\n\nconst event = body.event || body;\nconst text = event.text || event.message || '';\nconst user = event.user_name || event.user || 'Someone';\nconst channel = event.channel_name || event.channel || 'a channel';\n\nif (!text) {\n  return [{ json: { skip: true, reason: 'Empty message' } }];\n}\n\nconst message = `*Slack \u2014 #${channel}*\\n${user}: ${text}`;\n\nreturn [{\n  json: {\n    session_id: SESSION_ID,\n    chat_id: MY_PHONE + '@c.us',\n    message: message,\n    channel: channel,\n    sender: user,\n    skip: false\n  }\n}];"
      },
      "typeVersion": 2
    },
    {
      "id": "k1000001-0000-4000-0b00-000000000003",
      "name": "Valid?",
      "type": "n8n-nodes-base.if",
      "position": [
        440,
        0
      ],
      "parameters": {
        "conditions": {
          "options": {
            "leftValue": "",
            "caseSensitive": true,
            "typeValidation": "strict"
          },
          "combinator": "and",
          "conditions": [
            {
              "id": "not-skip",
              "operator": {
                "type": "boolean",
                "operation": "equals"
              },
              "leftValue": "={{ $json.skip }}",
              "rightValue": false
            }
          ]
        }
      },
      "typeVersion": 2
    },
    {
      "id": "k1000001-0000-4000-0b00-000000000004",
      "name": "Send to WhatsApp",
      "type": "n8n-nodes-base.httpRequest",
      "position": [
        660,
        -100
      ],
      "parameters": {
        "url": "https://apiv2.waiflow.app/api/v2/messages/send",
        "method": "POST",
        "options": {},
        "jsonBody": "={{ JSON.stringify({ session_id: $json.session_id, chat_id: $json.chat_id, message: $json.message }) }}",
        "sendBody": true,
        "specifyBody": "json",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth"
      },
      "credentials": {
        "httpHeaderAuth": {
          "name": "<your credential>"
        }
      },
      "typeVersion": 4.2
    },
    {
      "id": "k1000001-0000-4000-0b00-000000000005",
      "name": "Log",
      "type": "n8n-nodes-base.code",
      "position": [
        880,
        -100
      ],
      "parameters": {
        "mode": "runOnceForAllItems",
        "jsCode": "const data = $('Format Message').first().json;\nreturn [{ json: { status: 'forwarded', channel: data.channel, from: data.sender } }];"
      },
      "typeVersion": 2
    }
  ],
  "settings": {
    "executionOrder": "v1"
  },
  "connections": {
    "Valid?": {
      "main": [
        [
          {
            "node": "Send to WhatsApp",
            "type": "main",
            "index": 0
          }
        ],
        []
      ]
    },
    "Slack Webhook": {
      "main": [
        [
          {
            "node": "Format Message",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Format Message": {
      "main": [
        [
          {
            "node": "Valid?",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Send to WhatsApp": {
      "main": [
        [
          {
            "node": "Log",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  }
}

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

About this workflow

Slack sends an outgoing webhook when a message is posted in a channel The message text, sender, and channel name are extracted A formatted message is forwarded to your WhatsApp number via MoltFlow Empty messages and Slack URL verification challenges are handled automatically…

Source: https://n8n.io/workflows/13485/ — original creator credit. Request a take-down →

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