Extract & Structure Invoice Data with Google Vision OCR, Gemini LLM & Google Sheets — n8n Workflow

Medium complexity⚡ Trigger12 nodes🏷️ Invoice Processingby Budi SJ

Overview

Automated Invoice Collection & Data Extraction Using Vision API and LLM

This workflow automates the process of collecting uploaded invoices, extracting text using Google Vision API, and processing the extracted text with an LLM to produce structured data containing key transaction details such as date, voucher number, transaction detail, vendor, and transaction value.
The final data is saved to Google Sheets and a notification is sent to Telegram in real time.

✨ Key Features Invoice Upload F

Nodes used

Google SheetsHTTP RequestTelegramGoogle DriveCodeBasic LLM ChainStructured Output ParserOpenRouter Chat Model

Workflow Preview

Automated Invoice Collection & Data Extractio
This workflow automates the process of collecting uploa
- This node triggers the workflow when a user
- Uploads the file received from the form into a specif
- Downloads the file from
- Converts the downloaded invoice file (binar
- Adds the Google Vision API key into the workflow data
- Processes OCR text through an LLM to extrac
- Forces the LLM to produce output in a fixed JSON sche
- Cleans and normalizes numeric fields from the LLM out
- Writes the extracted and cleaned invoice da
- Sends a Telegram message summarizing the new or updat
modelparser
S
Set Vision API
Basic LLM Chain
OpenRouter Chat Model
Structured Output Parser
Download file
HTTP Request
Send a text message
Upload file
Code
Code1
Append or update row in …
⚡
O
On form submission
12 nodes11 edges

How it Works

  1. 1

    Trigger

    The workflow starts with a trigger trigger.

  2. 2

    Process

    Data flows through 12 nodes, connecting chainllm, code, formtrigger.

  3. 3

    Output

    The workflow completes its automation and delivers the result to the configured destination.

Node Details (12)

GO

Google Sheets

googleSheets

#1
HT

HTTP Request

httpRequest

#2
TE

Telegram

telegram

#3
GO

Google Drive

googleDrive

#4
CO

Code

code

#5
BA

Basic LLM Chain

n8n-nodes-langchain.chainLlm

#6
ST

Structured Output Parser

n8n-nodes-langchain.outputParserStructured

#7
OP

OpenRouter Chat Model

n8n-nodes-langchain.lmChatOpenRouter

#8

How to Import This Workflow

  1. 1Click Download JSON button on the right to save the workflow file.
  2. 2Open your n8n instance. Go to Workflows → New → Import from file.
  3. 3Select the downloaded extract-structure-invoice-data-with-google-vision-ocr-gemini-llm-google-sheets file and click Import.
  4. 4Set up credentials for each service node (API keys, OAuth, etc.).
  5. 5Click Test Workflow to verify everything works, then activate it.

Or paste directly in n8n → Import from JSON:

{ "name": "Extract & Structure Invoice Data with Google Vision OCR, Gemini LLM & Google Sheets", "nodes": [...], ...}

Integrations

chainllmcodeformtriggergoogledrivegooglesheetshttprequestlmchatopenrouteroutputparserstructuredsettelegram

Get This Workflow

Download and import in one click

Download JSONView on n8n.io
Nodes12
Complexitymedium
Triggertrigger
CategoryInvoice Processing

Created by

Budi SJ

Budi SJ

@budisj

Tags

chainllmcodeformtriggergoogledrivegooglesheetshttprequestlmchatopenrouteroutputparserstructuredsettelegram
⚡

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🔗 Webhook·12 nodes