n8n Lead Qualification Webhook: GPT-4o-mini + Slack

Instant Lead Qualification via Webhook + GPT-4o-mini, with Slack alerts

This n8n workflow receives lead data through a webhook, validates and qualifies it using OpenAI (gpt-4o-mini), then posts a “new lead” notification to Slack—and returns a JSON result to the requester. It’s built for fast, automated sales triage.

What this workflow does

• Receives lead data via POST on an n8n webhook endpoint (requires at minimum name and email in the JSON body).
• Validates and normalizes the payload, ensuring required fields exist and adding metadata such as source and a timestamp.
• Qualifies the lead with OpenAI Chat Completions using gpt-4o-mini, producing a structured JSON output that includes a score, reasoning, and a suggested action.
• Parses and merges results into the lead record and flags the lead as qualified when the score is 7 or higher.
• Logs a placeholder “write to Google Sheets” result (simulated for now), intended to be replaced with a real Google Sheets/CRM write step.
• Posts to Slack via an incoming webhook with a formatted “new lead” notification, and then returns the processing result as the webhook response.

Use cases

• Auto-qualify leads from a landing page form by sending name/email to the webhook and triggering Slack notifications.
• Route high-intent prospects faster by using the qualification score (7+) to prioritize follow-ups.
• SaaS ops teams that want a single, auditable webhook response for lead processing logic.

Technical details

• n8n Webhook (incoming POST) + Respond to Webhook
• Code node for validation/normalization and response handling
• HTTP Request to OpenAI Chat Completions (gpt-4o-mini)
• HTTP Request to Slack via incoming webhook
• Placeholder step for Google Sheets / CRM storage

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