Validate Web Form Leads & Sync to HubSpot + Slack via Webhook

Validate form leads, sync to HubSpot, and alert Slack—automatically

This n8n workflow receives your web form submissions via webhook, validates and normalizes lead fields, upserts matching contacts into HubSpot by email, and posts Slack notifications for both successful syncs and submissions that need manual review.

What this workflow does

• Receives form data via webhook: Listens for a POST request to an n8n webhook endpoint from your form tool.
• Normalizes incoming fields: Trims whitespace, lowercases the email address, and maps the payload into consistent lead fields.
• Validates required inputs: Ensures a name is present and verifies the email using a basic email regex pattern.
• Upserts into HubSpot (by email): If valid, the workflow upserts a contact in HubSpot using the contacts batch upsert endpoint keyed by email, passing name, company, and message as contact properties.
• Notifies Slack: Posts a confirmation message to a target Slack channel when the lead is synced successfully.
• Routes invalid submissions for review: If validation fails, it skips HubSpot and posts the submission details to a separate Slack review channel.

Use cases

• Capture demo request and contact form leads directly from a web form into HubSpot.
• Prevent bad data from polluting HubSpot by validating name and email before syncing.
• Keep your team informed in Slack with a clear distinction between synced leads and leads requiring manual review.

Technical details

• n8n nodes / tools: webhook, if, set, http request, slack, plus a sticky note.
• HubSpot integration: Uses a HubSpot private app with crm.objects.contacts.write scope and authenticates via an HTTP Header Auth credential: Authorization: Bearer <token>.
• Slack integration: Uses a Slack credential and sends messages to configured channels (e.g., new-leads and leads-review).

Setup (quick)

Copy the webhook production URL into your form tool and send name, email, company, and message in the request body, then configure the HubSpot token and Slack channels.