This workflow follows the Agent → HTTP Request recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "Invoice Extraction - Communications, Electricity and Water",
"nodes": [
{
"parameters": {},
"id": "manual-trigger",
"name": "Run manually",
"type": "n8n-nodes-base.manualTrigger",
"typeVersion": 1,
"position": [
-900,
0
]
},
{
"parameters": {
"rule": {
"interval": [
{
"field": "minutes",
"minutesInterval": 1
}
]
}
},
"id": "schedule-trigger",
"name": "Every minute",
"type": "n8n-nodes-base.scheduleTrigger",
"typeVersion": 1.2,
"position": [
-900,
-160
]
},
{
"parameters": {
"fileSelector": "/config/runtime/extraction.json",
"options": {}
},
"id": "read-extraction-config",
"name": "Read extraction config",
"type": "n8n-nodes-base.readWriteFile",
"typeVersion": 1.1,
"position": [
-680,
-260
]
},
{
"parameters": {
"operation": "text",
"destinationKey": "data",
"options": {
"encoding": "utf8",
"stripBOM": true
}
},
"id": "extract-config-text",
"name": "Extract config text",
"type": "n8n-nodes-base.extractFromFile",
"typeVersion": 1.1,
"position": [
-460,
-260
]
},
{
"parameters": {
"jsCode": "const config = JSON.parse(items[0].json.data);\nconst required = ['ollama_model', 'input_glob', 'register_path', 'register_file_name', 'worksheet_name', 'report_service_url', 'report_path', 'report_title', 'report_language', 'processed_directory', 'error_directory', 'currency', 'provider_labels'];\nfor (const field of required) {\n if (config[field] === undefined || config[field] === null || config[field] === '') {\n throw new Error('Missing required configuration field: ' + field);\n }\n}\nreturn [{ json: config }];"
},
"id": "parse-extraction-config",
"name": "Parse extraction config",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
-240,
-260
]
},
{
"parameters": {
"fileSelector": "/config/prompts/invoice-extractor.md",
"options": {}
},
"id": "read-extraction-prompt",
"name": "Read extraction prompt",
"type": "n8n-nodes-base.readWriteFile",
"typeVersion": 1.1,
"position": [
-20,
-260
]
},
{
"parameters": {
"operation": "text",
"destinationKey": "data",
"options": {
"encoding": "utf8",
"stripBOM": true
}
},
"id": "extract-prompt-text",
"name": "Extract extraction prompt",
"type": "n8n-nodes-base.extractFromFile",
"typeVersion": 1.1,
"position": [
200,
-260
]
},
{
"parameters": {
"fileSelector": "/config/schemas/invoice.schema.json",
"options": {}
},
"id": "read-invoice-schema",
"name": "Read invoice schema",
"type": "n8n-nodes-base.readWriteFile",
"typeVersion": 1.1,
"position": [
420,
-260
]
},
{
"parameters": {
"operation": "text",
"destinationKey": "data",
"options": {
"encoding": "utf8",
"stripBOM": true
}
},
"id": "extract-schema-text",
"name": "Extract invoice schema",
"type": "n8n-nodes-base.extractFromFile",
"typeVersion": 1.1,
"position": [
640,
-260
]
},
{
"parameters": {
"fileSelector": "={{ $('Parse extraction config').first().json.input_glob }}",
"options": {}
},
"id": "read-files",
"name": "Read invoice PDFs",
"type": "n8n-nodes-base.readWriteFile",
"typeVersion": 1.1,
"position": [
-680,
0
]
},
{
"parameters": {
"operation": "pdf",
"options": {}
},
"id": "extract-pdf",
"name": "Extract text from PDF",
"type": "n8n-nodes-base.extractFromFile",
"typeVersion": 1,
"position": [
-460,
-100
]
},
{
"parameters": {
"assignments": {
"assignments": [
{
"id": "source-file",
"name": "source_file",
"value": "={{ $('Read invoice PDFs').item.binary.data.fileName }}",
"type": "string"
},
{
"id": "invoice-text",
"name": "invoice_text",
"value": "={{ $json.text }}",
"type": "string"
}
]
},
"options": {}
},
"id": "prepare-input",
"name": "Prepare agent input",
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"position": [
-240,
-100
]
},
{
"parameters": {
"promptType": "define",
"text": "=Extrai os dados desta fatura. Nome: {{ $json.source_file }}\n\nTexto:\n{{ $json.invoice_text }}",
"options": {
"systemMessage": "={{ [$('Extract extraction prompt').first().json.data, 'JSON Schema:', $('Extract invoice schema').first().json.data].join(String.fromCharCode(10, 10)) }}"
}
},
"id": "extraction-agent",
"name": "Invoice Extraction Agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"typeVersion": 1.7,
"position": [
-20,
-100
]
},
{
"parameters": {
"model": "={{ $('Parse extraction config').first().json.ollama_model }}",
"options": {
"format": "json",
"temperature": 0.1
}
},
"id": "ollama-amalia-model",
"name": "Amalia via Ollama",
"type": "@n8n/n8n-nodes-langchain.lmChatOllama",
"typeVersion": 1,
"position": [
-20,
120
]
},
{
"parameters": {
"mode": "combine",
"combineBy": "combineByPosition",
"options": {}
},
"id": "merge-result-original",
"name": "Merge result with original PDF",
"type": "n8n-nodes-base.merge",
"typeVersion": 3.2,
"position": [
220,
0
]
},
{
"parameters": {
"jsCode": "const required = ['provider_type', 'supplier', 'invoice', 'customer', 'amounts', 'confidence', 'warnings'];\nconst first = (...values) => values.find((value) => value !== undefined && value !== null) ?? null;\nconst numberOrNull = (value) => { const number = Number(value); return value !== null && value !== '' && Number.isFinite(number) ? number : null; };\nconst addressText = (value) => value && typeof value === 'object' ? [value.street, value.number, value.floor, value.zip, value.city].filter(Boolean).join(', ') : first(value);\n\nreturn items.map((item, index) => {\n const raw = item.json.output ?? item.json.text ?? item.json.response ?? '';\n const sourceFile = item.binary?.data?.fileName ?? `invoice-${index + 1}.pdf`;\n const safeSourceFile = sourceFile.replace(/[^a-zA-Z0-9._-]/g, '_');\n const stem = safeSourceFile.replace(/\\.[^.]+$/, '') || `invoice-${index + 1}`;\n let parsed = null;\n const errors = [];\n\n try {\n const cleaned = typeof raw === 'string' ? raw.trim().replace(/^\\`\\`\\`(?:json)?\\s*/i, '').replace(/\\s*\\`\\`\\`$/, '') : raw;\n parsed = typeof cleaned === 'string' ? JSON.parse(cleaned) : cleaned;\n } catch (error) {\n errors.push(`Invalid JSON returned by the model: ${error.message}`);\n }\n\n if (!parsed || typeof parsed !== 'object' || Array.isArray(parsed)) {\n errors.push('The model output is not a JSON object.');\n } else {\n const source = parsed;\n const providerAliases = { electricity: 'edp', energy: 'edp', telecom: 'nos', telecommunications: 'nos', water: 'agua', \u00e1gua: 'agua' };\n let providerType = providerAliases[String(source.provider_type ?? '').toLowerCase()] ?? String(source.provider_type ?? '').toLowerCase();\n const supplierName = String(source.supplier?.name ?? '').toLowerCase();\n if (!['nos', 'edp', 'agua', 'unknown'].includes(providerType)) {\n providerType = supplierName.includes('edp') ? 'edp' : supplierName.includes('nos') ? 'nos' : 'unknown';\n }\n\n const period = source.invoice?.period ?? source.consumption?.electricity?.period ?? source.consumption?.water?.period ?? {};\n const amountSource = source.amounts ?? {};\n const electricityAmounts = amountSource.electricity ?? {};\n const warningSource = source.warnings ?? source.consumption?.warnings ?? [];\n const warnings = (Array.isArray(warningSource) ? warningSource : [warningSource]).map((warning) => typeof warning === 'string' ? warning : first(warning?.message, warning?.code, JSON.stringify(warning))).filter(Boolean);\n const confidenceSource = source.confidence;\n let confidence = numberOrNull(confidenceSource);\n if (confidence === null && confidenceSource && typeof confidenceSource === 'object') {\n confidence = numberOrNull(first(confidenceSource.extraction, confidenceSource.overall));\n if (confidence === null) {\n const scores = Object.values(confidenceSource).map(numberOrNull).filter((value) => value !== null);\n confidence = scores.length ? scores.reduce((sum, value) => sum + value, 0) / scores.length : null;\n }\n }\n\n const consumptionSource = source.consumption?.electricity ?? source.consumption?.water ?? source.consumption ?? {};\n const realReadings = consumptionSource.readings?.real ?? {};\n const total = numberOrNull(first(amountSource.total, source.invoice?.total_amount, source.payment?.total_amount, amountSource.total_before_taxes?.total));\n const tax = numberOrNull(first(amountSource.tax, amountSource.total_taxes_and_fees, electricityAmounts.taxes_fees?.total));\n const subtotal = numberOrNull(first(amountSource.subtotal, electricityAmounts.subtotal, total !== null && tax !== null ? total - tax : null));\n\n parsed = {\n provider_type: providerType || 'unknown',\n supplier: {\n name: first(source.supplier?.name),\n tax_id: first(source.supplier?.tax_id, source.supplier?.nif, source.supplier?.crc)\n },\n invoice: {\n number: first(source.invoice?.number),\n issue_date: first(source.invoice?.issue_date),\n due_date: first(source.invoice?.due_date, source.payment?.due_date),\n billing_period_start: first(source.invoice?.billing_period_start, period.start),\n billing_period_end: first(source.invoice?.billing_period_end, period.end)\n },\n customer: {\n name: first(source.customer?.name),\n tax_id: first(source.customer?.tax_id, source.customer?.nif),\n account_number: first(source.customer?.account_number, source.customer?.contract_code, source.customer?.customer_number),\n address: addressText(source.customer?.address)\n },\n amounts: { subtotal, tax, total, currency: first(amountSource.currency, source.invoice?.currency, 'EUR') },\n payment: {\n method: first(source.payment?.method),\n entity: first(source.payment?.entity, source.invoice?.reference?.entity),\n reference: first(source.payment?.reference, source.invoice?.reference?.identifier),\n iban: first(source.payment?.iban)\n },\n consumption: {\n value: numberOrNull(first(consumptionSource.value, realReadings.total, consumptionSource.total)),\n unit: first(consumptionSource.unit, providerType === 'edp' ? 'kWh' : providerType === 'agua' ? 'm3' : null),\n meter_or_cpe: first(consumptionSource.meter_or_cpe, source.customer?.cpe, source.customer?.meter, source.raw_fields?.cpe)\n },\n raw_fields: source.raw_fields && typeof source.raw_fields === 'object' ? source.raw_fields : {},\n confidence: confidence ?? 0,\n warnings\n };\n\n for (const field of required) if (!(field in parsed)) errors.push(`Missing required field: ${field}`);\n if (!['nos', 'edp', 'agua', 'unknown'].includes(parsed.provider_type)) errors.push('Invalid provider_type.');\n if (typeof parsed.confidence !== 'number' || parsed.confidence < 0 || parsed.confidence > 1) errors.push('confidence must be between 0 and 1.');\n if (!Array.isArray(parsed.warnings)) errors.push('warnings must be an array.');\n if (parsed.amounts?.currency !== 'EUR') errors.push('amounts.currency must be EUR.');\n if (parsed.amounts?.total === null) errors.push('The total invoice amount could not be determined.');\n }\n\n const isValid = errors.length === 0;\n const payload = isValid ? parsed : { source_file: sourceFile, status: 'error', errors, normalized_output: parsed, raw_model_output: raw };\n const resultName = isValid ? `${stem}.json` : `${stem}.error.json`;\n const resultData = Buffer.from(JSON.stringify(payload, null, 2), 'utf8').toString('base64');\n\n return {\n json: { is_valid: isValid, source_file: sourceFile, safe_source_file: safeSourceFile, result_file: resultName, validation_errors: errors, invoice: isValid ? parsed : null },\n binary: { ...(item.binary ?? {}), result: { data: resultData, mimeType: 'application/json', fileName: resultName, fileExtension: 'json' } },\n pairedItem: { item: index }\n };\n});"
},
"id": "parse-validate",
"name": "Parse and validate result",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
440,
0
]
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "strict",
"version": 2
},
"conditions": [
{
"id": "is-valid-condition",
"leftValue": "={{ $json.is_valid }}",
"rightValue": true,
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
}
}
],
"combinator": "and"
},
"options": {}
},
"id": "valid-result",
"name": "Valid extraction?",
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"position": [
660,
0
]
},
{
"parameters": {
"fileSelector": "={{ $('Parse extraction config').first().json.register_path }}",
"options": {}
},
"id": "read-invoice-register",
"name": "Read invoice register",
"type": "n8n-nodes-base.readWriteFile",
"typeVersion": 1.1,
"position": [
900,
-140
],
"onError": "continueRegularOutput"
},
{
"parameters": {
"operation": "write",
"fileName": "={{ $('Parse extraction config').first().json.processed_directory + '/' + $binary.data.fileName.replace(/[^a-zA-Z0-9._-]/g, '_') }}",
"dataPropertyName": "data",
"options": {}
},
"id": "archive-processed",
"name": "Copy PDF to processed",
"type": "n8n-nodes-base.readWriteFile",
"typeVersion": 1.1,
"position": [
1140,
-140
]
},
{
"parameters": {
"operation": "write",
"fileName": "={{ $('Parse extraction config').first().json.error_directory + '/' + $json.result_file }}",
"dataPropertyName": "result",
"options": {}
},
"id": "write-error-report",
"name": "Write error report",
"type": "n8n-nodes-base.readWriteFile",
"typeVersion": 1.1,
"position": [
900,
140
]
},
{
"parameters": {
"operation": "write",
"fileName": "={{ $('Parse extraction config').first().json.error_directory + '/' + $json.safe_source_file }}",
"dataPropertyName": "data",
"options": {}
},
"id": "archive-error",
"name": "Copy PDF to error",
"type": "n8n-nodes-base.readWriteFile",
"typeVersion": 1.1,
"position": [
1140,
140
]
},
{
"parameters": {
"jsCode": "return items.map((item, index) => {\n const invoice = item.json.invoice;\n return {\n json: {\n 'Processed At': new Date().toISOString(),\n 'Source File': item.json.source_file,\n 'Provider': invoice.provider_type,\n 'Supplier': invoice.supplier?.name ?? null,\n 'Invoice Number': invoice.invoice?.number ?? null,\n 'Issue Date': invoice.invoice?.issue_date ?? null,\n 'Payment Due Date': invoice.invoice?.due_date ?? null,\n 'Customer Name': invoice.customer?.name ?? null,\n 'Customer Tax ID': invoice.customer?.tax_id ?? null,\n 'Customer Account': invoice.customer?.account_number ?? null,\n 'Customer Address': invoice.customer?.address ?? null,\n 'Payment Method': invoice.payment?.method ?? null,\n 'Multibanco Entity': invoice.payment?.entity ?? null,\n 'Multibanco Reference': invoice.payment?.reference ?? null,\n 'IBAN': invoice.payment?.iban ?? null,\n 'Amount': invoice.amounts?.total ?? null,\n 'Currency': invoice.amounts?.currency ?? 'EUR',\n 'Confidence': invoice.confidence ?? null,\n 'Warnings': Array.isArray(invoice.warnings) ? invoice.warnings.join(' | ') : ''\n },\n binary: item.binary,\n pairedItem: { item: index }\n };\n});"
},
"id": "prepare-excel-row",
"name": "Prepare Excel row",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
880,
-200
]
},
{
"parameters": {
"operation": "xlsx",
"options": {
"headerRow": true,
"rawData": false,
"readAsString": false
}
},
"id": "extract-invoice-register",
"name": "Extract current register",
"type": "n8n-nodes-base.extractFromFile",
"typeVersion": 1.1,
"position": [
1120,
-320
],
"onError": "continueRegularOutput"
},
{
"parameters": {
"mode": "append",
"options": {}
},
"id": "append-register-row",
"name": "Append row to register",
"type": "n8n-nodes-base.merge",
"typeVersion": 3.2,
"position": [
1360,
-220
]
},
{
"parameters": {
"jsCode": "const seen = new Set();\nconst rows = [];\nconst config = $('Parse extraction config').first().json;\nconst providerLabels = config.provider_labels ?? {};\nfor (const item of items) {\n if (!item.json || !item.json['Source File']) continue;\n const provider = String(item.json.Provider ?? '').toLowerCase();\n item.json.Provider = providerLabels[provider] ?? provider;\n item.json.Currency = item.json.Currency ?? config.currency;\n const key = `${item.json['Source File']}|${item.json['Invoice Number'] ?? ''}`;\n if (seen.has(key)) continue;\n seen.add(key);\n rows.push({ json: item.json });\n}\nreturn rows;"
},
"id": "deduplicate-register",
"name": "Deduplicate register",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1580,
-220
]
},
{
"parameters": {
"operation": "xlsx",
"binaryPropertyName": "data",
"options": {
"fileName": "={{ $('Parse extraction config').first().json.register_file_name }}",
"headerRow": true,
"sheetName": "={{ $('Parse extraction config').first().json.worksheet_name }}"
}
},
"id": "convert-register-xlsx",
"name": "Build updated Excel register",
"type": "n8n-nodes-base.convertToFile",
"typeVersion": 1.1,
"position": [
1800,
-220
]
},
{
"parameters": {
"operation": "write",
"fileName": "={{ $('Parse extraction config').first().json.register_path }}",
"dataPropertyName": "data",
"options": {}
},
"id": "write-invoice-register",
"name": "Write invoice register",
"type": "n8n-nodes-base.readWriteFile",
"typeVersion": 1.1,
"position": [
2020,
-220
]
},
{
"parameters": {
"method": "POST",
"url": "={{ $('Parse extraction config').first().json.report_service_url }}",
"sendBody": true,
"contentType": "raw",
"rawContentType": "application/json",
"body": "={{ JSON.stringify({ rows: $('Deduplicate register').all().map(item => item.json), report_path: $('Parse extraction config').first().json.report_path, title: $('Parse extraction config').first().json.report_title, language: $('Parse extraction config').first().json.report_language }) }}",
"options": {
"timeout": 120000
}
},
"id": "generate-word-report",
"name": "Generate Word expense report",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
2240,
-220
]
}
],
"connections": {
"Run manually": {
"main": [
[
{
"node": "Read extraction config",
"type": "main",
"index": 0
}
]
]
},
"Every minute": {
"main": [
[
{
"node": "Read extraction config",
"type": "main",
"index": 0
}
]
]
},
"Read extraction config": {
"main": [
[
{
"node": "Extract config text",
"type": "main",
"index": 0
}
]
]
},
"Extract config text": {
"main": [
[
{
"node": "Parse extraction config",
"type": "main",
"index": 0
}
]
]
},
"Parse extraction config": {
"main": [
[
{
"node": "Read extraction prompt",
"type": "main",
"index": 0
}
]
]
},
"Read extraction prompt": {
"main": [
[
{
"node": "Extract extraction prompt",
"type": "main",
"index": 0
}
]
]
},
"Extract extraction prompt": {
"main": [
[
{
"node": "Read invoice schema",
"type": "main",
"index": 0
}
]
]
},
"Read invoice schema": {
"main": [
[
{
"node": "Extract invoice schema",
"type": "main",
"index": 0
}
]
]
},
"Extract invoice schema": {
"main": [
[
{
"node": "Read invoice PDFs",
"type": "main",
"index": 0
}
]
]
},
"Read invoice PDFs": {
"main": [
[
{
"node": "Extract text from PDF",
"type": "main",
"index": 0
},
{
"node": "Merge result with original PDF",
"type": "main",
"index": 1
}
]
]
},
"Extract text from PDF": {
"main": [
[
{
"node": "Prepare agent input",
"type": "main",
"index": 0
}
]
]
},
"Prepare agent input": {
"main": [
[
{
"node": "Invoice Extraction Agent",
"type": "main",
"index": 0
}
]
]
},
"Invoice Extraction Agent": {
"main": [
[
{
"node": "Merge result with original PDF",
"type": "main",
"index": 0
}
]
]
},
"Amalia via Ollama": {
"ai_languageModel": [
[
{
"node": "Invoice Extraction Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Merge result with original PDF": {
"main": [
[
{
"node": "Parse and validate result",
"type": "main",
"index": 0
}
]
]
},
"Parse and validate result": {
"main": [
[
{
"node": "Valid extraction?",
"type": "main",
"index": 0
}
]
]
},
"Valid extraction?": {
"main": [
[
{
"node": "Prepare Excel row",
"type": "main",
"index": 0
}
],
[
{
"node": "Write error report",
"type": "main",
"index": 0
}
]
]
},
"Prepare Excel row": {
"main": [
[
{
"node": "Read invoice register",
"type": "main",
"index": 0
},
{
"node": "Append row to register",
"type": "main",
"index": 1
},
{
"node": "Copy PDF to processed",
"type": "main",
"index": 0
}
]
]
},
"Read invoice register": {
"main": [
[
{
"node": "Extract current register",
"type": "main",
"index": 0
}
]
]
},
"Extract current register": {
"main": [
[
{
"node": "Append row to register",
"type": "main",
"index": 0
}
]
]
},
"Append row to register": {
"main": [
[
{
"node": "Deduplicate register",
"type": "main",
"index": 0
}
]
]
},
"Deduplicate register": {
"main": [
[
{
"node": "Build updated Excel register",
"type": "main",
"index": 0
}
]
]
},
"Build updated Excel register": {
"main": [
[
{
"node": "Write invoice register",
"type": "main",
"index": 0
}
]
]
},
"Write invoice register": {
"main": [
[
{
"node": "Generate Word expense report",
"type": "main",
"index": 0
}
]
]
},
"Write error report": {
"main": [
[
{
"node": "Copy PDF to error",
"type": "main",
"index": 0
}
]
]
}
},
"settings": {
"executionOrder": "v1"
},
"active": false,
"versionId": "a532fb5f-993e-4bc3-b937-cd8fafc68121",
"meta": {
"templateCredsSetupCompleted": false
},
"tags": []
}
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About this workflow
Invoice Extraction - Communications, Electricity and Water. Uses readWriteFile, agent, lmChatOllama, httpRequest. Event-driven trigger; 28 nodes.
Source: https://github.com/ruialexrib/n8n-invoice-extraction/blob/main/workflows/invoice-extraction.json — original creator credit. Request a take-down →
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