# Auto-categorize blog posts with OpenAI and GitHub: n8n workflow

> Started by someone submitting a form, and works across GitHub and Google Sheets. It puts OpenAI behind a retrieval step, so answers are drawn from documents...

Source: https://millionrounds.com/workflow/auto-categorize-blog-posts-with-openai-and-github (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Content](https://millionrounds.com/workflows?category=Content#library)

# Auto-categorize blog posts with OpenAI and GitHub

Started by someone submitting a form, and works across GitHub and Google Sheets. It puts OpenAI behind a retrieval step, so answers are drawn from documents you supply rather than from the model alone. 18 steps, 1 branch, 1 loop or waits: a working afternoon to understand properly.

Medium Calls a model: OpenAI Retrieval

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fauto-categorize-blog-posts-with-openai-and-github)

**18 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**1** Loop or waits

**2** Services it connects to

## The flow

Starts it 1 Model 4 Logic 7 Service 6

The steps in the order they run, from what starts it.

- 1 **Simple Memory** Memory Buffer Window *Model*
- 2 **OpenAI Chat Model** Lm Chat Open Ai *Model*
- 3 **On form submission** Form trigger *Starts it*
- 4 **Structured Output Parser** Output Parser Structured *Model*
- 5 **AI Agent** Agent *Model*
- 6 **Get row(s) in sheet** Google Sheets *Service*
- 7 **List posts/articles/pages** Github *Service*
- 8 **Append rows with posts / article analysis** Google Sheets *Service*
- 9 **List FileName only / Remove duplicates** Code *Logic*
- 10 **Get paths to files only from GitHub repository** Aggregate *Logic*
- 11 **Loop Over Posts/Pages** Split In Batches *Logic*
- 12 **Get file paths only from GoogleSheets** Aggregate *Logic*
- 13 **Merge GitHub and Google Sheets read** Merge *Logic*
- 14 **Proces finished - Categories and tags added** Form *Service*
- 15 **Check new repo files for AI processing** Code *Logic*
- 16 **Switch** Switch *Logic*
- 17 **No new posts/articles in GitHub** Form *Service*
- 18 **Get post/article file** Github *Service*

## How it's built

- **Starts on:** Someone submitting a form
- **Steps:** 18, with 1 branch, 1 loop or waits
- **Size:** Medium: a working afternoon
- **Connects to:** GitHub, Google Sheets
- **Model:** OpenAI
- **Retrieval:** Answers are drawn from documents you supply, not from the model alone

## Questions

What does it need to run?

An n8n account, plus your own GitHub and Google Sheets accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on someone submitting a form.

Does it use AI?

Yes. It calls OpenAI. Its answers draw on documents you give it, not on the model alone. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 18 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 18 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fauto-categorize-blog-posts-with-openai-and-github)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[GitHub](https://millionrounds.com/workflows?service=GitHub#library)[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)

## Workflows like it

Also content, with the same services where possible, closest in size first.

- [**AI-powered content factory: RSS to blog, Instagram & TikTok** 18 steps · calls a model · Google Sheets, Slack](https://millionrounds.com/workflow/ai-powered-content-factory-rss-to-blog-instagram-and-tiktok)
- [**Analyze Facebook post comment sentiment with OpenAI** 18 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/analyze-facebook-post-comment-sentiment-with-openai)
- [**Analyze Reddit posts with OpenAI and Gmail** 18 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/analyze-reddit-posts-with-openai-and-gmail)
- [**Audio transcription & chat bot with AssemblyAI and Gemini** 18 steps · calls a model · Google Sheets, Pinecone](https://millionrounds.com/workflow/audio-transcription-and-chat-bot-with-assemblyai-and-gemini)
- [**Audit landing page SEO with OpenAI** 18 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/audit-landing-page-seo-with-openai)
- [**Auto-generate platform-optimized social media posts** 18 steps · calls a model · Google Sheets, WordPress](https://millionrounds.com/workflow/auto-generate-platform-optimized-social-media-posts)