Extract structured invoice data from text with OpenAI

by Laurence NIcolaou · 1 views · created 2026-09-02 · Invoice Processing, AI Summarization

What this workflow does

This workflow has 8 nodes and runs manually, when you click “Execute workflow”. It uses only n8n's built-in nodes. It also calls api.openai.com over HTTP.

How it runs

Trigger: Manually, when you click “Execute workflow”.

1. Set Invoice Text (Edit Fields (Set)): sets 1 field: invoice_text
2. Set Extraction Prompt (Edit Fields (Set)): sets 2 fields: extraction_prompt, model
3. Extract Invoice Data (OpenAI) (HTTP Request): calls api.openai.com (POST)
4. Parse AI Response (Code): runs custom JavaScript code
5. Route Error or Success (If): checks a condition and branches into true / false

HTTP calls to: api.openai.com

Before you upgrade to n8n 3.0

Nodes used (6)

• Manual Triggern8n-nodes-base.manualTrigger
• Edit Fields (Set)n8n-nodes-base.set
• HTTP Requestn8n-nodes-base.httpRequest
• Coden8n-nodes-base.code
• Ifn8n-nodes-base.if
• No Operation, do nothingn8n-nodes-base.noOp

From the author

Quick overview This workflow lets you paste invoice text and uses OpenAI Chat Completions to extract normalized, schema-based invoice fields as clean JSON, routing parse or extraction failures to a separate error output. How it works 1. Starts when you run…

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