Gmail Invoice Parser — AI Automation with n8n + LLMs
An AI-powered automation that reads Gmail invoice attachments, extracts key fields using LLMs, and stores the results in Airtable — built entirely using n8n.
This project streamlines the process of handling incoming invoices via Gmail. The low-code workflow I built in n8n automates the following:
✅ Detects new emails with PDF invoice attachments
✅ Extracts raw text from the attached PDFs
✅ Sends that content to an LLM via LangChain + OpenRouter
✅ Parses key fields like vendor, date, line items, and total amount
✅ Validates and auto-corrects output using schema-aware retry logic
✅ Saves the structured data into Airtable for dashboards, exports, or further processing
It’s fully modular, requires minimal code, and is designed for freelancers, finance teams, and ops teams who want to eliminate manual invoice handling and boost productivity.
Project Links: GitHub Repo, Medium Article, Demo Video
19 Jun 2025
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