Instantly notify a rep in Slack when a high-intent lead books a demo using n8n

Prerequisites

Why n8n?

n8n gives you event-driven demo alerts with a visual workflow builder. The HubSpot Trigger node fires on form submissions, and the Code node handles the owner-to-Slack mapping without external services. Self-hosted n8n is free with unlimited executions — important when every demo booking generates an alert regardless of volume.

The trade-off vs. Zapier is setup time (slightly more configuration), but you get faster execution, no per-task limits, and full control over the routing logic.

How it works

• HubSpot Trigger fires on form submissions, then an IF node filters to your demo form
• HTTP Request fetches the full contact record with enrichment data
• Code node maps the HubSpot owner ID to a Slack user ID using a lookup dictionary
• Slack node sends a Block Kit DM to the assigned rep (or a fallback channel for unassigned leads)

Step 1: Add a HubSpot Trigger node

Create a new workflow and add a HubSpot Trigger node:

• Authentication: Select your HubSpot credential
• Event: Form Submission

This fires every time someone submits a form in HubSpot. The payload includes the form ID and the contact's email.

Step 2: Filter to the demo form

Add an IF node:

• Condition: {{ $json.formId }} equals YOUR_DEMO_FORM_ID

Only the "true" branch continues. This prevents alerts for newsletter signups, content downloads, and other forms.

Step 3: Fetch the contact record

Add an HTTP Request node to get the full contact:

• Method: GET
• URL: https://api.hubapi.com/crm/v3/objects/contacts/{{ $json.objectId }}
• Authentication: Predefined -> HubSpot API
• Query params: properties=firstname,lastname,email,jobtitle,company,numberofemployees,industry,hubspot_owner_id,hs_analytics_source

Step 4: Look up the owner's Slack user ID

Add a Code node to map the HubSpot owner ID to a Slack user ID:

const contact = $('Fetch Contact').first().json;
const props = contact.properties;
 
// HubSpot owner ID → Slack user ID mapping
const ownerToSlack = {
  '12345678': 'U01AAAA',  // Alice
  '23456789': 'U02BBBB',  // Bob
  '34567890': 'U03CCCC',  // Carol
  '45678901': 'U04DDDD',  // Dave
};
 
const ownerId = props.hubspot_owner_id;
const slackUserId = ownerToSlack[ownerId];
 
if (!slackUserId) {
  // No owner or unmapped owner — send to a fallback channel
  return [{ json: { ...props, contactId: contact.id, slackTarget: '#demo-alerts', isFallback: true } }];
}
 
return [{ json: {
  contactId: contact.id,
  name: `${props.firstname || ''} ${props.lastname || ''}`.trim(),
  email: props.email,
  title: props.jobtitle,
  company: props.company,
  employees: props.numberofemployees,
  industry: props.industry,
  source: props.hs_analytics_source,
  slackTarget: slackUserId,
  isFallback: false,
}}];

Step 5: Send a Slack DM with Block Kit

Add a Slack node:

• Resource: Message
• Operation: Send
• Channel: {{ $json.slackTarget }}
• Message Type: Block Kit

{
  "blocks": [
    {
      "type": "header",
      "text": { "type": "plain_text", "text": "🔥 Demo Booked!" }
    },
    {
      "type": "section",
      "fields": [
        { "type": "mrkdwn", "text": "*Name:*\n{{ $json.name }}" },
        { "type": "mrkdwn", "text": "*Title:*\n{{ $json.title || 'Not provided' }}" },
        { "type": "mrkdwn", "text": "*Company:*\n{{ $json.company || 'Unknown' }}" },
        { "type": "mrkdwn", "text": "*Size:*\n{{ $json.employees || 'Unknown' }} employees" },
        { "type": "mrkdwn", "text": "*Industry:*\n{{ $json.industry || 'Unknown' }}" },
        { "type": "mrkdwn", "text": "*Source:*\n{{ $json.source || 'Unknown' }}" }
      ]
    },
    {
      "type": "actions",
      "elements": [
        {
          "type": "button",
          "text": { "type": "plain_text", "text": "View Contact" },
          "url": "https://app.hubspot.com/contacts/YOUR_PORTAL_ID/contact/{{ $json.contactId }}",
          "style": "primary"
        }
      ]
    }
  ]
}

Step 6: Activate

1. Submit your demo form with test data
2. Verify the Slack DM arrives with the correct contact info
3. Toggle the workflow to Active

Common questions

Should I use a Form Submission trigger or a Contact Property Changed trigger?

Form Submission is more direct — it fires when someone submits a form. But it fires for ALL forms, so you need the IF node to filter. Contact Property Changed on recent_conversion_event_name is an alternative that works even for non-HubSpot forms (Typeform, Calendly) that sync to HubSpot. Choose based on how your demo bookings enter HubSpot.

How fast is the notification?

With the HubSpot Trigger node, notifications arrive within 1-5 seconds of the form submission. This is webhook-based, so there's no polling delay.

What if the lead doesn't have an assigned owner yet?

The Code node falls back to a #demo-alerts channel for unassigned leads. For best results, chain this with a lead routing recipe so the owner is assigned before the alert fires.

How do I handle a large sales team?

The owner-to-Slack mapping in the Code node works for teams up to ~20 reps. For larger teams, store the mapping in a Google Sheet or n8n's built-in data store, and look up the Slack user ID dynamically.

Cost

• n8n Cloud Starter: $24/mo for 2,500 executions. Each demo booking = 1 execution.
• Self-hosted: Free. Unlimited executions.