🧾Automated Invoice Processing: Mistral OCR + GPT-4o-mini for Intelligent Data Extraction

Intelligent, End-to-End Data Extraction with n8n

Revolutionize your invoice workflow using the power of AI. This advanced n8n automation combines the precision of Mistral AI’s OCR with the intelligence of OpenAI’s GPT-4o-mini, enabling effortless extraction, structuring, and processing of invoice data — with minimal configuration.

🔍 Key Features

✅ Advanced Document Recognition – Leverages Mistral’s cutting-edge OCR, built to handle complex invoice layouts and multi-format documents.

✅ AI-Powered Data Structuring – GPT-4o-mini interprets unstructured text, recognizing and organizing key invoice fields intelligently.

✅ Multi-Page Handling – Seamlessly supports long, multi-page invoices with accurate data continuity.

✅ Fully Automated Workflow – From file upload to structured output in seconds — no manual input required.

✅ Custom JSON Output – Extracts detailed data including vendor info, line items, totals, and more, formatted in a standardized JSON schema.

📋 What’s Extracted

• Vendor and customer details
• Invoice numbers, dates, and payment terms
• Itemized lines with descriptions, quantities, and prices
• Financial totals and tax breakdowns
• User and metadata for tracking and auditing

🔧 How It Works

This n8n workflow automates the full pipeline:

1. Monitors Google Drive for new invoice uploads
2. Encodes documents in Base64 for API compatibility
3. Calls Mistral OCR API with authentication and document payload
4. Processes multi-page content, stitching it into a unified text block
5. Uses GPT-4o-mini with custom prompts to extract structured data
6. Parses results into a standardized JSON schema

🚀 Get Started in Minutes

1. Create a Mistral AI account → https://console.mistral.ai/
2. Set up your OpenAI API key (GPT-4o-mini access)
3. Connect your Google Drive credentials to n8n
4. Import this workflow, configure the keys — and you’re live!

💼 Use Cases

• Finance Teams: Automate invoice capture and approvals
• Accounting: Feed structured data into your bookkeeping systems
• Expense Management: Cut manual work on vendor billing
• Document Digitization: Convert scanned/PDF invoices into structured formats
• BI & Analytics: Unlock invoice insights by vendor, category, or timeframe