Automate WordPress category mapping with GPT-5 Mini (Azure OpenAI)

Description

Map content topics to the right WordPress categories automatically. WP Category Toolkit reads your WordPress categories via REST API, lets a GPT-5-mini model decide which IDs fit your topic, and hands back a clean mapping. No more copy-paste guesswork, tagging errors drop, and your site stays organized.



Last updated: September 2026.

Why Use WP Category Toolkit?

Saves time:** Manual category lookup becomes a batch job measured in minutes.
Stops messy tagging:** Consistent category assignments, so archives and SEO behave.
Measurable improvement:** Faster publish cycles with far fewer category fixes (manual mapping errors down ~90%).
Competitive edge:** An LLM reads topic intent, so categories match meaning, not guesswork.

Perfect For

Content Managers:** Keep large WordPress catalogs neat without spreadsheet gymnastics.
Agencies:** Onboard client sites faster by automating taxonomy mapping across projects.
Developers & Automators:** Drop an LLM-powered mapping step into content pipelines without building custom classifiers.

How It Works

Trigger: Manual start. Kick it off when you are ready to map categories.
Process: Pulls all site categories from your WordPress REST endpoint, aggregates the list, and feeds the source content plus current topic into the mapping step.
Smart Logic: A Chain LLM node (Category-Mapping) uses a small prompt to decide which WordPress category IDs match the content topic (GPT-5-mini handles the reasoning).
Output: A clean category ID mapping you can paste into your Body Post WordPress node or use to patch posts automatically.

Quick Setup

Import JSON file to your n8n instances
Add credentials: WordPress API credential & Azure OpenAI (GPT-5-mini) credential, or you can use the standard OpenAI node
Update: Replace the WP endpoint URL (REST API docs) and any post-body endpoints you will write back to
Test: Run with a sample post and copy the output mapping into your Body Post WordPress node to confirm IDs match expected categories

You'll Need

Active n8n instances
WordPress REST API access and credentials (wp-json access)
Azure OpenAI account with access to GPT-5-mini
Integrations: WordPress API node, Chain LLM / Azure OpenAI node
(Optional) Staging WordPress site to test mappings safely

Level Up Ideas

Auto-write category descriptions based on mapped content using the LLM.
Patch posts automatically after mapping so mapping becomes truly zero-touch.
Add fallback heuristics: if the LLM is uncertain, route to a Slack or Microsoft Teams approval step.

Quick Answers
What do I feed it?
Your content topic plus your site's category list pulled from the WordPress REST API.
What comes back?
A clean mapping of WordPress category IDs matched to your topic.
Which model decides?
GPT-5-mini (Azure OpenAI), guided by a small mapping prompt.

Made by: khmuhtadin
Tags: WordPress, Categories, AI, n8n
Category: WordPress
Need custom work? Contact me

Additional info
Built with n8n. Need an assessment on your business? Feel free to reach out at https://khmuhtadin.com/consultation/