Lead Capture & Qualification n8n Workflow: GPT-4o-mini + Sheets + Slack

Turn new lead submissions into qualified opportunities—automatically

This Lead Capture & Qualification n8n Workflow receives lead details on an n8n webhook, validates and normalizes the data, then uses OpenAI Chat Completions (GPT-4o-mini) to generate a 1–10 qualification score, reasoning, and a recommended next action. It logs the result and sends a Slack notification—then returns a JSON response to the caller.

What this workflow does

• Accepts POST lead submissions via an n8n webhook (lead details in the request body).
• Validates required fields: checks that email and name are present.
• Ensures email format is valid and normalizes the payload with defaults such as source and a timestamp.
• Qualifies the lead with OpenAI by sending the lead data to the OpenAI Chat Completions API, returning JSON containing:
  • a qualification score (1–10)
  • reasoning
  • suggested action
• Parses results and merges them with the original lead data, flagging the lead as qualified when the score is 7 or higher.
• Logs the processed lead (as a placeholder for Google Sheets/CRM) and generates a simulated row reference.
• Notifies your team in Slack with a formatted “new lead captured” message including name, email, score, and suggested action.
• Responds back with JSON to the webhook caller.

Use cases

• Score inbound form leads from your website and alert your sales channel in Slack.
• Qualify leads captured by a CRM or marketing tool by posting to the n8n webhook.
• Automate lead triage: route “qualified” leads (score ≥ 7) for immediate follow-up.

Technical details

• n8n nodes: code, webhook, http request, respond to webhook
• OpenAI: OpenAI Chat Completions using GPT-4o-mini (request includes your OpenAI API key)
• Slack: posts via your Slack incoming webhook URL
• Output: returns a JSON response after qualification and notification