Automating LEGO Blog Posts with ChatGPT, DALL·E, and n8n

An n8n Tech Recipe by Darren Redmond

Welcome to this step-by-step recipe on how to build a fully automated LEGO review publishing machine for your WordPress blog using n8n, ChatGPT, DALL·E, and the WordPress REST API.

If you’ve ever dreamed of feeding a list of LEGO set numbers into a machine and waking up to fully written, beautifully illustrated blog posts on RedmondReviews.com, this is the blueprint.

🛠️ Ingredients

Before we cook up this automation, make sure you’ve got the following:

• ✅ An n8n instance (self-hosted or cloud)
• ✅ OpenAI API Key
• ✅ Admin access to RedmondReviews.com (WordPress with REST API enabled)
• ✅ Application password for WordPress REST API
• ✅ A list of LEGO set numbers (CSV, Google Sheets, or hardcoded in n8n)

🧪 Method

Step 1: Set Your Trigger

Create a trigger node in n8n.

Options:

• Manual trigger (for testing)
• Scheduled trigger (e.g. daily at 10am)
• Google Sheets trigger (for new rows) <- the one that matches this use-case best.

n8n

Node: Trigger → Schedule
Every day at 10am

Step 2: Loop Through LEGO Set Numbers

Use a Set node to define your list or load from Google Sheets.

json

[
  { "setNumber": "75304" },
  { "setNumber": "75255" },
  { "setNumber": "75408" }
]

Then use SplitInBatches if handling multiple sets.

Step 3: (Optional) Get LEGO Set Metadata

You can skip this, but for added flavour, use the Brickset API to enrich your post.

Step 4: Generate Blog Post with ChatGPT

Node: OpenAI (Chat Completion)
Model: gpt-4o
Prompt:

kotlin

Write a fun and family-friendly 400-word blog post for RedmondReviews.com reviewing LEGO set {{setNumber}}. Include building experience details for Darren (age 50), Luke (age 7) and Rose (age 4) if it’s a Star Wars set.

Step 5: Generate Stylised Image with DALL·E

Node: OpenAI (Image Generation)
Prompt:

arduino

Create a stylised cartoon image of Darren (age 50, black hair), Luke (age 7) and Rose (age 4) building LEGO set {{setNumber}} at a kitchen table. Include LEGO and Star Wars elements if relevant.

Step 6: Upload Image to WordPress

Node: HTTP Request
Method: POST
URL: https://www.redmondreviews.com/wp-json/wp/v2/media
Headers:

http

Authorization: Basic <base64(username:application_password)>
Content-Type: image/png

Body: Binary image buffer from OpenAI output

Capture the returned ID for use in the next step.

Step 7: Create and Publish the Blog Post

Node: HTTP Request
Method: POST
URL: https://www.redmondreviews.com/wp-json/wp/v2/posts
Body:

json

{
  "title": "LEGO {{setNumber}} Review",
  "content": "{{blogPostContent}}",
  "status": "publish",
  "featured_media": {{imageUploadID}},
  "categories": [123], 
  "tags": ["lego", "star wars", "{{setNumber}}"]
}

Make sure to set the correct category ID and include tags.

Voila – the blog posts, 75408 and 75409 now exist.

🔁 Bonus Features (Optional but Fun)

• ✅ Send a Slack message or email when the post is live
• ✅ Add Airtable row for tracking published sets
• ✅ Automatically shorten post URL with Bitly

🧠 Final Thoughts

This setup turns a simple Google spreadsheet of LEGO set numbers into a living, breathing stream of blog content; written, illustrated, and published while you sleep. You can easily extend this recipe to include Instagram posting, Pinterest cards, or newsletter triggers.

Obviously this is a simple example and this recipe can be used with slight modifications to find a list of data for your SME, for example Leads, then make queries to do market research, then configure the output into a pdf, word doc, or google doc, and send the output to a sales BD to follow up. Trigger the job before leaving work, come to work the next day with a list of leads to follow up with, market research on each lead, potential sales call talking points or script – the adaptations are endless.

Want the n8n workflow export JSON or help setting up a secure n8n and WordPress connection? Drop me a message or leave a comment below.

🧱 Until next recipe,
Darren