Generate technical n8n workflow reports with GPT-4.1 and Google Docs

Who is this workflow for?

This workflow is designed for technical teams, automation owners, process auditors, and anyone who needs to document n8n workflows in a consistent, fast, and professional way—without manual work.

What problem does it solve? / Use case

Documenting n8n workflows is often slow and error-prone: you need to review nodes, configurations, connections, internal logic, and embedded code.

This workflow automates that process by generating a complete technical report, structured and ready to share, ensuring documentation is:

• consistent
• easy to update
• easy to review
• accessible in Google Drive

What this workflow does

• Lets you select an n8n workflow to document
• Extracts its structure, nodes, connections, and settings
• Normalizes the JSON to remove noise and keep what matters
• Generates a HTML technical report using an LLM (OpenAI GPT-4.1)
• Detects whether Code nodes exist
• If Code nodes exist, analyzes their logic and adds an extra technical section
• Creates a final Google Docs document inside a Google Drive folder

High-level flow

1. Manual workflow start
2. Target workflow selection
3. Workflow normalization (cleanup + structure)
4. Main report generation with OpenAI
5. Code node extraction
6. Condition: Code nodes exist or not
7. (Optional) technical analysis of Code nodes with OpenAI
8. Merge main report + code analysis
9. Create the final document in Google Docs

Setup

OpenAI

Configure OpenAI credentials (API Key).

The workflow uses OpenAI nodes to:

• generate the main report
• analyze Code nodes (if any)

Google Drive

• Configure Google Drive OAuth2 credentials with write permissions
• Define a destination folder using a folder ID (e.g., YOUR_FOLDER_ID)
• The workflow uploads the final HTML as a Google Docs document

n8n (access to the target workflow)

If your instance requires it, configure access to read internal workflows.

The workflow fetches the selected workflow using an n8n Get Workflow node.

How to customize this workflow

• Report format: adjust the prompt in the Generate Report node to change sections, style, or level of detail
• Output folder: replace YOUR_FOLDER_ID with the real Drive folder ID
• Documentation strategy:
  • generate shorter reports for small workflows
  • split large reports if the workflow is very big
• Automated triggering: replace the manual start with a webhook trigger if you want to use an external application

Final outcome

A system that automatically generates a professional technical Google Docs document containing:

• workflow description
• global configuration
• node-by-node breakdown
• routing logic (conditions and branches)
• required credentials
• operational requirements
• risks and observations
• additional Code node analysis (if applicable)

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🔗 https://www.linkedin.com/in/ramonvillaverde