Intelligent Document Processing: Automating Invoice, Contract, and Form Extraction with Vision-Language Models

Businesses process millions of documents daily — invoices, purchase orders, contracts, insurance claims. Manual data entry is slow, expensive, and error-prone. Intelligent Document Processing (IDP) uses vision-language AI to extract structured data automatically.

1. IDP Pipeline Architecture

[ Scanned PDF / Photo ] --> [ OCR + Layout Detection ] --> [ Vision-Language Model ]
                                                                    |
                                                                    v
                                                          [ Structured JSON Output ]
                                                                    |
                                                                    v
                                                          [ ERP / Database Integration ]

2. Extraction with Multimodal LLMs

async function extractInvoiceData(documentImageUrl: string) {
  const response = await llm.chat({
    model: "gemini-2.5-pro",
    messages: [{
      role: "user",
      content: [
        { type: "image_url", image_url: { url: documentImageUrl } },
        { type: "text", text: `Extract the following fields as JSON:
          - vendor_name, invoice_number, invoice_date
          - line_items: [{ description, quantity, unit_price, total }]
          - subtotal, tax, total_amount, payment_terms` }
      ]
    }],
    response_format: { type: "json_object" }
  });

  return JSON.parse(response.content);
}

IDP reduces document processing time from minutes to seconds while achieving 95%+ extraction accuracy across diverse document formats.