{ "workflow": { "id": 7239, "name": "Parse invoices & documents with Gemini AI, OCR, and Google Sheets integration", "views": 1311, "recentViews": 1, "totalViews": 1311, "createdAt": "2025-08-11T11:01:37.132Z", "description": "## Smart Document Parser for Invoices, Logs or Sensor Reports (PDF/Image to Google Sheets)\n\nThis n8n workflow automatically parses documents such as invoices, sensor logs or structured PDFs/images (including scanned docs or CSVs), extracts key fields like totals, dates and customer/vendor info using OCR and AI, and writes the structured output into Google Sheets.\n\n## Who’s it for\n\n* Finance or Ops teams automating invoice processing.\n* SaaS platforms parsing uploaded reports or documents.\n* Anyone needing a no-code backend for PDF/image/CSV document parsing.\n* AI-powered data capture pipelines.\n\n## How it works\n1. **Webhook Trigger** receives file uploads (`/uploadDoc`)\n2. **Switch Node** checks the file type:\n\t* If **image** → Use **Tesseract OCR**\n\t* If **PDF** → Use PDF parser\n\t* If **CSV** → Extract as-is\n3. Extracted text is passed to:\n\t* **Google Gemini or Gemini Flash AI** model\n\t* Prompt extracts fields like `invoice_id`, `total`, `customer_name`, etc.\n4. JSON string is parsed and cleaned\n5. Data is appended to **Google Sheets** using `appendOrUpdate`\n\n## How to set up\n1. Create a Google Sheet with columns like:\n\n`invoice_id`, `invoice_date`, `due_date`, `customer_name`, `vendor_name`, `subtotal`, `tax_total`, `total`, `currency`\n\n2. Connect:\n\t* Google Sheets OAuth\n\t* Google Gemini (PaLM API key) for LLM parsing\n3. Deploy the webhook endpoint: `/uploadDoc`\n4. Upload sample files (PDFs, images, CSVs) to test\n5. Review and map sheet columns in the `Invoice Data` node\n\n## Requirements\n\n| Tool | Purpose |\n| ------------- | --------------------------------- |\n| n8n | Automation framework |\n| Google Sheets | To store structured output |\n| Tesseract OCR | For scanned image text extraction |\n| Google Gemini | For natural language parsing |\n\n## How to customize\n\n* Add extraction for **line items** using structured prompts.\n* Change prompt to extract **sensor readings**, **log types**, or custom keys.\n* Add support for other file types (e.g., XLSX, DOCX).\n* Add Slack/Email notifications on success/failure.\n* Swap Gemini with OpenAI or Hugging Face if preferred.\n\n## Add‑ons\n\n* Save uploaded files to Google Drive or S3\n* Add auth for secure uploads\n* Use charting/dashboard nodes to visualize extracted data\n* Integrate with billing/accounting software\n\n## Use Case Examples\n\n| Scenario | What Happens |\n| ----------------------- | ------------------------------------------------------- |\n| Invoice Upload (PDF) | Extracts totals, customer, tax data into a Google Sheet |\n| Scanned Receipt (Image) | OCR + LLM extracts structured data |\n| Log File (CSV) | Parses and logs entries into Sheets |\n\n## Common troubleshooting\n\n| Issue | Possible Cause | Solution |\n| --------------------------------- | ----------------------- | ------------------------------------------- |\n| `Webhook not triggered` | URL or method mismatch | Use correct POST URL `/uploadDoc` |\n| `Text is blank` | OCR failed | Check image quality or Tesseract config |\n| `Gemini model not returning JSON` | Prompt formatting issue | Ensure prompt ends with valid JSON schema |\n| `Sheet not updated` | Invalid Sheet ID or tab | Double-check sheet credentials and tab name |\n\n## Need Help?\n\n- Need help fine-tuning the Gemini prompt for better field accuracy?\n- Want to extract full tables, multi-page invoices or convert PDFs to JSON lines?\n\nOur automation team at WeblineIndia can help you extend this into a full-blown document automation pipeline.", "workflow": { "id": "c92ZApSKwsRmg6zb", "meta": { "instanceId": "14e4c77104722ab186539dfea5182e419aecc83d85963fe13f6de862c875ebfa", "templateCredsSetupCompleted": true }, "name": "Smart Document Parser for Invoices, Logs or Sensor Reports (PDF/Image/csv to Sheet)", "tags": [], "nodes": [ { "id": "98517a08-3fc4-4c0c-aa4b-44d93c864eb4", "name": "Check file type", "type": "n8n-nodes-base.switch", "position": [ 220, 860 ], "parameters": { "rules": { "values": [ { "conditions": { "options": { "version": 2, "leftValue": "", "caseSensitive": true, "typeValidation": "strict" }, "combinator": "and", "conditions": [ { "id": "40ee8e68-2b72-4ba9-b7a2-8c976852d48b", "operator": { "type": "string", "operation": "contains" }, "leftValue": "={{ $('Webhook Invoice upload').item.binary.file.mimeType }}", "rightValue": "image" } ] } }, { "conditions": { "options": { "version": 2, "leftValue": "", "caseSensitive": true, "typeValidation": "strict" }, "combinator": "and", "conditions": [ { "id": "c4315e16-313f-4363-a625-71436498e46a", "operator": { "name": "filter.operator.equals", "type": "string", "operation": "equals" }, "leftValue": "={{ $('Webhook Invoice upload').item.binary.file.mimeType }}", "rightValue": "application/pdf" } ] } }, { "conditions": { "options": { "version": 2, "leftValue": "", "caseSensitive": true, "typeValidation": "strict" }, "combinator": "and", "conditions": [ { "id": "cffb0678-f006-47e0-91ea-afd17f133a77", "operator": { "type": "string", "operation": "contains" }, "leftValue": "={{ $('Webhook Invoice upload').item.binary.file.mimeType }}", "rightValue": "csv" } ] } } ] }, "options": {} }, "typeVersion": 3.2 }, { "id": "6ef5d99c-b842-4290-9766-8b780df66f6b", "name": "Invoice data", "type": "n8n-nodes-base.googleSheets", "position": [ 738, 1110 ], "parameters": { "columns": { "value": { "total": "={{ $json.total }}", "currency": "={{ $json.currency }}", "due_date": "={{ $json.due_date }}", "subtotal": "={{ $json.subtotal }}", "tax_total": "={{ $json.tax_total }}", "invoice_id": "={{ $json.invoice_id }}", "vendor_name": "={{ $json.vendor_name }}", "invoice_date": "={{ $json.invoice_date }}", "customer_name": "={{ $json.customer_name }}" }, "schema": [ { "id": "invoice_id", "type": "string", "display": true, "removed": false, "required": false, "displayName": "invoice_id", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "invoice_date", "type": "string", "display": true, "required": false, "displayName": "invoice_date", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "due_date", "type": "string", "display": true, "required": false, "displayName": "due_date", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "customer_name", "type": "string", "display": true, "required": false, "displayName": "customer_name", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "vendor_name", "type": "string", "display": true, "required": false, "displayName": "vendor_name", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "subtotal", "type": "string", "display": true, "required": false, "displayName": "subtotal", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "tax_total", "type": "string", "display": true, "required": false, "displayName": "tax_total", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "total", "type": "string", "display": true, "required": false, "displayName": "total", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "currency", "type": "string", "display": true, "required": false, "displayName": "currency", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "customer_address", "type": "string", "display": true, "removed": true, "required": false, "displayName": "customer_address", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "customer_tax_id", "type": "string", "display": true, "removed": true, "required": false, "displayName": "customer_tax_id", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "vendor_address", "type": "string", "display": true, "removed": true, "required": false, "displayName": "vendor_address", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "vendor_tax_id", "type": "string", "display": true, "removed": true, "required": false, "displayName": "vendor_tax_id", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "vendor_iban", "type": "string", "display": true, "removed": true, "required": false, "displayName": "vendor_iban", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "vendor_bic", "type": "string", "display": true, "removed": true, "required": false, "displayName": "vendor_bic", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "line_id", "type": "string", "display": true, "removed": true, "required": false, "displayName": "line_id", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "description", "type": "string", "display": true, "removed": true, "required": false, "displayName": "description", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "quantity", "type": "string", "display": true, "removed": true, "required": false, "displayName": "quantity", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "unit_price", "type": "string", "display": true, "removed": true, "required": false, "displayName": "unit_price", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "line_total", "type": "string", "display": true, "removed": true, "required": false, "displayName": "line_total", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "tax_rate", "type": "string", "display": true, "removed": true, "required": false, "displayName": "tax_rate", "defaultMatch": false, "canBeUsedToMatch": true } ], "mappingMode": "defineBelow", "matchingColumns": [ "invoice_id" ], "attemptToConvertTypes": false, "convertFieldsToString": false }, "options": {}, "operation": "appendOrUpdate", "sheetName": { "__rl": true, "mode": "list", "value": 0, "cachedResultUrl": "", "cachedResultName": "Invoice" }, "documentId": { "__rl": true, "mode": "list", "value": "0", "cachedResultUrl": "", "cachedResultName": "" } }, "credentials": { "googleSheetsOAuth2Api": { "id": "", "name": "" } }, "typeVersion": 4.6 }, { "id": "6b0ce6fd-5d09-4bc2-a3b2-cc8c0e2878d6", "name": "Invoice Data", "type": "n8n-nodes-base.googleSheets", "position": [ 1256, 760 ], "parameters": { "columns": { "value": { "total": "={{ $json.total }}", "currency": "={{ $json.currency }}", "due_date": "={{ $json.due_date }}", "subtotal": "={{ $json.subtotal }}", "tax_total": "={{ $json.tax_total }}", "invoice_id": "={{ $json.invoice_id }}", "vendor_name": "={{ $json.vendor_name }}", "invoice_date": "={{ $json.invoice_date }}", "customer_name": "={{ $json.customer_name }}" }, "schema": [ { "id": "invoice_id", "type": "string", "display": true, "removed": false, "required": false, "displayName": "invoice_id", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "invoice_date", "type": "string", "display": true, "required": false, "displayName": "invoice_date", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "due_date", "type": "string", "display": true, "required": false, "displayName": "due_date", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "customer_name", "type": "string", "display": true, "required": false, "displayName": "customer_name", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "vendor_name", "type": "string", "display": true, "required": false, "displayName": "vendor_name", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "subtotal", "type": "string", "display": true, "required": false, "displayName": "subtotal", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "tax_total", "type": "string", "display": true, "required": false, "displayName": "tax_total", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "total", "type": "string", "display": true, "required": false, "displayName": "total", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "currency", "type": "string", "display": true, "required": false, "displayName": "currency", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Accounting", "type": "string", "display": true, "removed": true, "required": false, "displayName": "Accounting", "defaultMatch": false, "canBeUsedToMatch": true } ], "mappingMode": "defineBelow", "matchingColumns": [ "invoice_id" ], "attemptToConvertTypes": false, "convertFieldsToString": false }, "options": {}, "operation": "appendOrUpdate", "sheetName": { "__rl": true, "mode": "list", "value": 0, "cachedResultUrl": "", "cachedResultName": "Invoice" }, "documentId": { "__rl": true, "mode": "list", "value": "0", "cachedResultUrl": "", "cachedResultName": "" } }, "credentials": { "googleSheetsOAuth2Api": { "id": "", "name": "" } }, "typeVersion": 4.6 }, { "id": "7f5b8ffe-d4e8-4b7b-803e-6c37d0da0221", "name": "Transfrom data", "type": "n8n-nodes-base.code", "position": [ 1036, 760 ], "parameters": { "jsCode": "const raw = $input.first().json.text || '';\n\n// 1. Remove code block syntax like ```json ... ```\nconst cleaned = raw.replace(/```json|```/g, '').trim();\n\n\n const parsed = JSON.parse(cleaned);\n return [{ json: parsed }];" }, "typeVersion": 2, "alwaysOutputData": true }, { "id": "b818ac61-4837-4a9f-b90e-bb6b4b7739c1", "name": "Google Gemini Chat Model", "type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini", "position": [ 748, 880 ], "parameters": { "options": {}, "modelName": "models/gemini-1.5-flash" }, "credentials": { "googlePalmApi": { "id": "", "name": "" } }, "typeVersion": 1 }, { "id": "2941bf32-0db6-4486-8696-e207de09364c", "name": "Format data from text", "type": "@n8n/n8n-nodes-langchain.chainLlm", "position": [ 660, 660 ], "parameters": { "text": "=Extract the following invoice details from the given raw text:\n\n- invoice_id \n- invoice_date \n- due_date \n- customer_name \n- vendor_name \n- subtotal \n- tax_total \n- total \n- currency\n\nUse the following input text:\n{{ $json.text }}\n\nReturn the result as a valid JSON object using this exact structure:\n\n{\n \"invoice_id\": \"string or null\",\n \"invoice_date\": \"string (e.g., 2024-10-10) or null\",\n \"due_date\": \"string (e.g., 2024-10-25) or null\",\n \"customer_name\": \"string or null\",\n \"vendor_name\": \"string or null\",\n \"subtotal\": \"string or null\",\n \"tax_total\": \"string or null\",\n \"total\": \"string or null\",\n \"currency\": \"string (e.g., €, $, £) or null\"\n}\n\nIf any field is missing or not found, set it as `null`. Return only the JSON output without extra text.\n", "batching": {}, "promptType": "define" }, "typeVersion": 1.7 }, { "id": "7c829587-f028-4332-831f-92f9529b72ca", "name": "Webhook Invoice upload", "type": "n8n-nodes-base.webhook", "position": [ 0, 860 ], "webhookId": "3dafecda-82df-4af9-84f2-7815ffa81319", "parameters": { "path": "uploadDoc", "options": {}, "httpMethod": "POST" }, "typeVersion": 2 }, { "id": "05176b33-fcda-4f1a-84fa-2449108a0a54", "name": "PDF to Text", "type": "n8n-nodes-base.extractFromFile", "position": [ 440, 860 ], "parameters": { "options": {}, "operation": "pdf", "binaryPropertyName": "file" }, "typeVersion": 1 }, { "id": "81690344-d04c-428b-b720-bb539fbe2bbe", "name": "Image to Text", "type": "n8n-nodes-tesseractjs.tesseractNode", "position": [ 440, 660 ], "parameters": { "options": {}, "inputDataFieldName": "file" }, "typeVersion": 1 }, { "id": "a0f49ed7-1d42-4df8-a802-74754d1549c0", "name": "CSV to JSON", "type": "n8n-nodes-base.extractFromFile", "position": [ 440, 1110 ], "parameters": { "options": {}, "binaryPropertyName": "file" }, "typeVersion": 1 }, { "id": "0473ba6b-734e-4f53-8ecb-86711db1bd76", "name": "Sticky Note", "type": "n8n-nodes-base.stickyNote", "position": [ -60, 1300 ], "parameters": { "color": 2, "width": 1500, "height": 540, "content": "---\n### **Purpose**\n * To automatically extract structured data from uploaded documents (PDFs, images, or CSVs) — such as invoices, logs, or reports — and save the results into Google Sheets using AI and OCR.\n\n---\n### **Core Logic**\n1. **Webhook Trigger** receives the uploaded document.\n2. **Switch Node** detects file type:\n * Image → Parsed using **Tesseract OCR**\n * PDF → Parsed via built-in PDF extractor\n * CSV → Parsed as raw text\n3. Extracted text is sent to **Google Gemini AI** to identify fields like:\n * `invoice_id`, `invoice_date`, `total`, etc.\n4. AI output is converted into valid JSON.\n5. JSON is **appended to Google Sheets** via `appendOrUpdate`.\n\n---\n### **Outcome**\n* Extracted invoice/report data is stored cleanly in a Google Sheet.\n* Works with scanned documents, images, and structured files.\n* Enables AI-powered automation of manual data entry workflows." }, "typeVersion": 1 }, { "id": "63a9e69e-566c-4db6-9d31-b25f438fbd26", "name": "Sticky Note1", "type": "n8n-nodes-base.stickyNote", "position": [ -72, 550 ], "parameters": { "color": 7, "width": 1500, "height": 720, "content": "## Smart Document Parser for Invoices, Logs or Sensor Reports (PDF/Image/csv to Sheet)" }, "typeVersion": 1 } ], "active": false, "pinData": {}, "settings": { "executionOrder": "v1" }, "versionId": "b5ae5035-b75f-4f8d-8d43-020fdb2c529e", "connections": { "CSV to JSON": { "main": [ [ { "node": "Invoice data", "type": "main", "index": 0 } ] ] }, "PDF to Text": { "main": [ [ { "node": "Format data from text", "type": "main", "index": 0 } ] ] }, "Image to Text": { "main": [ [ { "node": "Format data from text", "type": "main", "index": 0 } ] ] }, "Transfrom data": { "main": [ [ { "node": "Invoice Data", "type": "main", "index": 0 } ] ] }, "Check file type": { "main": [ [ { "node": "Image to Text", "type": "main", "index": 0 } ], [ { "node": "PDF to Text", "type": "main", "index": 0 } ], [ { "node": "CSV to JSON", "type": "main", "index": 0 } ] ] }, "Format data from text": { "main": [ [ { "node": "Transfrom data", "type": "main", "index": 0 } ] ] }, "Webhook Invoice upload": { "main": [ [ { "node": "Check file type", "type": "main", "index": 0 } ] ] }, "Google Gemini Chat Model": { "ai_languageModel": [ [ { "node": "Format data from text", "type": "ai_languageModel", "index": 0 } ] ] } } }, "lastUpdatedBy": 29, "workflowInfo": { "nodeCount": 12, "nodeTypes": { "n8n-nodes-base.code": { "count": 1 }, "n8n-nodes-base.switch": { "count": 1 }, "n8n-nodes-base.webhook": { "count": 1 }, "n8n-nodes-base.stickyNote": { "count": 2 }, "n8n-nodes-base.googleSheets": { "count": 2 }, "n8n-nodes-base.extractFromFile": { "count": 2 }, "@n8n/n8n-nodes-langchain.chainLlm": { "count": 1 }, "n8n-nodes-tesseractjs.tesseractNode": { "count": 1 }, "@n8n/n8n-nodes-langchain.lmChatGoogleGemini": { "count": 1 } } }, "status": "published", "user": { "name": "WeblineIndia", "username": "weblineindia", "bio": "A Leading Software Engineering, Consulting & Outsourcing Services Company in USA & India serving Clients Globally since 1999.", "verified": true, "links": [ "https://www.weblineindia.com/" ], "avatar": "https://gravatar.com/avatar/a229d43aefca4588581583c58bb37b4773aebbdf4c1fef86a08bb1d38eae91fa?r=pg&d=retro&size=200" }, "nodes": [ { "id": 18, "icon": "file:googleSheets.svg", "name": "n8n-nodes-base.googleSheets", "codex": { "data": { "alias": [ "CSV", "Sheet", "Spreadsheet", "GS" ], "resources": { "generic": [ { "url": "https://n8n.io/blog/love-at-first-sight-ricardos-n8n-journey/", "icon": "❤️", "label": "Love at first sight: Ricardo’s n8n journey" }, { "url": "https://n8n.io/blog/why-business-process-automation-with-n8n-can-change-your-daily-life/", "icon": "🧬", "label": "Why business process automation with n8n can change your daily life" }, { "url": "https://n8n.io/blog/automatically-adding-expense-receipts-to-google-sheets-with-telegram-mindee-twilio-and-n8n/", "icon": "🧾", "label": "Automatically Adding Expense Receipts to Google Sheets with Telegram, Mindee, Twilio, and n8n" }, { "url": "https://n8n.io/blog/supercharging-your-conference-registration-process-with-n8n/", "icon": "🎫", "label": "Supercharging your conference registration process with n8n" }, { "url": "https://n8n.io/blog/creating-triggers-for-n8n-workflows-using-polling/", "icon": "⏲", "label": "Creating triggers for n8n workflows using polling" }, { "url": "https://n8n.io/blog/no-code-ecommerce-workflow-automations/", "icon": "store", "label": "6 e-commerce workflows to power up your Shopify s" }, { "url": "https://n8n.io/blog/migrating-community-metrics-to-orbit-using-n8n/", "icon": "📈", "label": "Migrating Community Metrics to Orbit using n8n" }, { "url": "https://n8n.io/blog/automate-google-apps-for-productivity/", "icon": "💡", "label": "15 Google apps you can combine and automate to increase productivity" }, { "url": "https://n8n.io/blog/your-business-doesnt-need-you-to-operate/", "icon": " 🖥️", "label": "Hey founders! 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