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Auto-generate WordPress blog tags with GPT-4.1-mini and smart tag mapping

Bhavy ShekhaliyaBhavy Shekhaliya
194 views
2/3/2026
File MetadataCloud StorageGoogle DriveAutomationFile Upload
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Overview

This n8n template demonstrates how to use AI to automatically analyze WordPress blog content and generate relevant, SEO-optimized tags for WordPress posts.

Use cases

Automate content tagging for WordPress blogs, maintain consistent taxonomy across large content libraries, save hours of manual tagging work, or improve SEO by ensuring every post has relevant, searchable tags!

Good to know

  • The workflow creates new tags automatically if they don't exist in WordPress.
  • Tag generation is intelligent - it avoids duplicates by mapping to existing tag IDs.

How it works

  • We fetch a WordPress blog post using the WordPress node with sticky data enabled for testing.
  • The post content is sent to GPT-4.1-mini which analyzes it and generates 5-10 relevant tags using a structured output parser.
  • All existing WordPress tags are fetched via HTTP Request to check for matches.
  • A smart loop processes each AI-generated tag:
    • If the tag already exists, it maps to the existing tag ID
    • If it's new, it creates the tag via WordPress API
  • All tag IDs are aggregated and the WordPress post is updated with the complete tag list.

How to use

  • The manual trigger node is used as an example but feel free to replace this with other triggers such as webhook, schedule, or WordPress webhook for new posts.
  • Modify the "Fetch One WordPress Blog" node to fetch multiple posts or integrate with your publishing workflow.

Requirements

  • WordPress site with REST API enabled
  • OpenAI API

Customising this workflow

  • Adjust the AI prompt to generate tags specific to your industry or SEO strategy
  • Change the tag count (currently 5-10) based on your needs
  • Add filtering logic to only tag posts in specific categories

Auto-Generate WordPress Blog Tags with GPT-4o Mini and Smart Tag Mapping

This n8n workflow automates the process of generating relevant tags for WordPress blog posts using an AI model (GPT-4o Mini) and intelligently mapping them to existing WordPress tags. This ensures consistent tagging, improves SEO, and saves time for content creators.

What it does

This workflow performs the following key steps:

  1. Manual Trigger: Initiates the workflow upon manual execution.
  2. Fetch Existing WordPress Tags: Retrieves all currently available tags from your WordPress site.
  3. Define LLM Chain: Sets up a LangChain LLM (Large Language Model) chain to interact with the AI model.
  4. Configure OpenAI Chat Model: Specifies the OpenAI GPT-4o Mini model for tag generation.
  5. Define Structured Output Parser: Configures how the AI's output should be parsed into a structured format (JSON).
  6. Generate AI Tags: Sends the WordPress post content (title and body) to the GPT-4o Mini model to generate a list of suggested tags.
  7. Extract AI Tags: Parses the AI-generated tags from the structured output.
  8. Loop Over AI Tags: Iterates through each AI-generated tag.
  9. Smart Tag Mapping: For each AI tag, it compares it against the existing WordPress tags to find the closest match.
  10. Aggregate Mapped Tags: Collects all the successfully mapped WordPress tags.
  11. Update WordPress Post: Updates the specified WordPress post with the aggregated, intelligently mapped tags.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Instance: A running instance of n8n.
  • WordPress Account: Access to a WordPress site with an n8n WordPress credential configured.
  • OpenAI API Key: An API key for OpenAI, specifically for accessing the GPT-4o Mini model, configured as an n8n credential.
  • WordPress Post ID: The ID of the WordPress post you wish to process. This is currently hardcoded in the "HTTP Request" node (ID: 19) and the "Wordpress" node (ID: 118). You will need to modify these to target your desired post dynamically or manually.

Setup/Usage

  1. Import the Workflow: Import the provided JSON workflow into your n8n instance.
  2. Configure Credentials:
    • Set up a WordPress credential that connects to your WordPress site.
    • Set up an OpenAI API Key credential for the GPT-4o Mini model.
  3. Update WordPress Post ID:
    • In the "HTTP Request" node (ID: 19), update the URL to fetch the content of your target WordPress post. Replace {{ $json.postId }} with the actual ID or a dynamic expression that provides it.
    • In the "Wordpress" node (ID: 118), ensure the "Post ID" is correctly set to the post you want to update. This should ideally come from the initial trigger or a preceding node.
  4. Activate the Workflow: Enable the workflow.
  5. Execute: Click "Execute Workflow" to run it manually. For continuous automation, you might consider replacing the "Manual Trigger" with a "Webhook" or "Cron" node to trigger it based on new post creation or a schedule.

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