Invoice Parsing in n8n — Automate Receipt & Invoice Extraction (No Code)

If invoices arrive in your inbox and you're still typing the data out manually, this workflow eliminates that entirely.

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✓ Free DocuParseAPI account✓ n8n account✓ A destination app

The guide

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Create a new workflow

In n8n click New Workflow. Add a trigger: Gmail Trigger → New Attachment for email invoices, or Manual Trigger for testing.

Add an HTTP Request node

After the trigger, add an HTTP Request node. Configure it exactly as shown below:

Method: POST
URL: https://docuparseapi.com/api/v1/extract
Authentication: Header Auth
Header Name: Authorization
Header Value: Bearer YOUR_API_KEY
Body Content Type: Multipart/Form-Data
Body Parameter Name: file
Body Parameter Value: {{ $binary.data }}
Body Parameter Type: File/Binary

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Map the fields

Add a Set node after HTTP Request. Map these fields:

merchant  →  {{ $json.merchant }}
total     →  {{ $json.total }}
tax       →  {{ $json.tax }}
currency  →  {{ $json.currency }}
date      →  {{ $json.date }}
invoice_id → {{ $json.invoice_id }}

Send to your destination

Add Google Sheets → Append Row. Map the Set node fields to your sheet columns. Done — every invoice creates a new row automatically. Add an IF node after HTTP Request to handle errors: condition {{ $json.success }} equals true, false path sends a Slack notification with {{ $json.error.code }}.

Full working example

json

{
  "name": "Invoice Parser — DocuParseAPI",
  "nodes": [
    { "name": "Manual Trigger", "type": "n8n-nodes-base.manualTrigger", "position": [250, 300] },
    { "name": "Extract Invoice", "type": "n8n-nodes-base.httpRequest", "position": [460, 300],
      "parameters": {
        "method": "POST",
        "url": "https://docuparseapi.com/api/v1/extract",
        "authentication": "headerAuth",
        "sendBody": true,
        "contentType": "multipart-form-data",
        "bodyParameters": { "parameters": [{
          "name": "file",
          "value": "={{ $binary.data }}",
          "parameterType": "formBinaryData"
        }] }
      }
    },
    { "name": "Map Fields", "type": "n8n-nodes-base.set", "position": [680, 300],
      "parameters": { "values": { "string": [
        { "name": "merchant", "value": "={{ $json.merchant }}" },
        { "name": "total", "value": "={{ $json.total }}" },
        { "name": "currency", "value": "={{ $json.currency }}" },
        { "name": "date", "value": "={{ $json.date }}" }
      ] } }
    }
  ]
}

What gets extracted

merchantThe vendor or store name

totalThe final charged amount including tax

subtotalThe pre-tax amount

taxThe tax amount charged

dateInvoice or transaction date (ISO 8601)

due_datePayment due date, or null if not present

invoice_idInvoice number or receipt ID from the document

currencyISO 4217 currency code (USD, EUR, GBP, etc.)

payment_methodCard type, cash, or other payment method

line_itemsArray of items with description, quantity, unit_price, total

Common errors and fixes

MISSING_API_KEYAuthorization header missingAdd header: Authorization: Bearer YOUR_KEY

INVALID_API_KEYKey not recognisedCheck key in dashboard — regenerate if needed

LIMIT_EXCEEDEDMonthly document limit reachedUpgrade at docuparseapi.com/pricing

UNSUPPORTED_FILE_TYPEFile format not supportedUse PDF, JPG, or PNG only

FILE_TOO_LARGE_AUTHENTICATEDFile exceeds 10 MBCompress the file before sending

EXTRACTION_FAILEDDocument could not be parsedTry a cleaner scan or different file

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