Forward Slack channel messages to WhatsApp with MoltFlow

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Built by Alex Pekler Alex Pekler
Created on June 15, 2026

Description

How it works

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

Set up steps (~5 min)

Create a MoltFlow account at molt.waiflow.app and connect your WhatsApp
Activate this workflow and copy the webhook URL
In Slack, configure an outgoing webhook or Event Subscription pointing to the n8n URL
Set YOUR_SESSION_ID and YOUR_PHONE in the Format Message code node
Add your MoltFlow API Key as Header Auth credential (header name: X-API-Key)

Prerequisites

MoltFlow account with active WhatsApp session
Slack workspace with webhook or Events API access
Tip: filter by channel or keywords in the code node to limit forwarding

Nodes Used (2)

Code
n8n-nodes-base.code
HTTP Request
n8n-nodes-base.httpRequest