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Formation n8n en Français : Automatisation & Agents IA

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🎯 What you will build

A lead-magnet SEO audit machine: a visitor submits their landing page URL and email in a hosted n8n form → the workflow scrapes the page → two GPT-5 mini chains run a technical audit (raw HTML) and a content audit (extracted text) → both are merged into one HTML report emailed to the visitor with Gmail → the lead is logged in Google Sheets.

Cost per run: a few cents with gpt-5-mini. Total build time live: ~20 minutes.

Audit request form (Form Trigger)
        │
        ▼
Configuration (Set)
        │
        ▼
Scrape landing page (HTTP Request)
        ├────────────────────────────► Run technical SEO audit (Basic LLM Chain)
        │                                        │  ▲
        ▼                                        │  └── OpenAI model (technical)
Extract page content (HTML)                     │
        │                                        │
        ▼                                        ▼
Run content SEO audit (Basic LLM Chain) ──► Combine both audits (Merge, append)
        ▲                                        │
        └── OpenAI model (content)               ▼
                                     Aggregate audit sections (Aggregate)
                                                 │
                                                 ▼
                                     Build HTML report (Markdown → HTML)
                                                 │
                                                 ▼
                                     Email the audit report (Gmail)
                                                 │
                                                 ▼
                                     Log the lead in Google Sheets

<aside> 💡

The big improvement vs the classic SEO audit template: the report is sent to the visitor's own email and every request is captured as a lead in Google Sheets. Your free audit becomes a lead-generation machine.

</aside>

🔑 Prerequisites & credentials

Credential	Type in n8n	How to create it
OpenAI account	openAiApi	Go to platform.openai.com → API keys → Create new secret key. In n8n: Credentials → New → OpenAI → paste the key → Save (n8n tests it automatically).
Gmail account	gmailOAuth2	In n8n: Credentials → New → Gmail OAuth2 → Sign in with Google → allow the Gmail send scope.
Google Sheets account	googleSheetsOAuth2Api	In n8n: Credentials → New → Google Sheets OAuth2 → Sign in with Google. Create a spreadsheet with one tab containing the headers: audited_at, page_url, email.

<aside> ⚠️

Never paste an API key directly into a node. All keys live in n8n Credentials only.

</aside>

⚙️ Node 1 — Configuration (documented first, built second)

This Set node is the single place a user configures the whole workflow. Every downstream node reads from it by expression.