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Audit & generate JSON-LD schema markup for SEO with GPT-4.1-mini + Gmail

Ari NakosAri Nakos
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2/3/2026
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Schema Markup Generator Automatically audit and optimize your site’s JSON-LD structured data and email a step-by-step implementation guide.

What It Does

  • Collects a website URL & email via form
  • Extracts existing JSON-LD, identifies gaps
  • Generates optimized schema markup (GPT-4.1-mini)
  • Builds an HTML before/after guide with action items
  • Emails the full implementation instructions

Prerequisites

  • n8n instance (self-hosted, Desktop, or Cloud)
  • Gmail OAuth2 credentials
  • OpenRouter API key (for GPT-4.1-mini)

Quick Setup

  1. Gmail: Add OAuth2 credential → select in “Send Email” node
  2. OpenRouter: Store API key → link in “Schema Markup Agent” node
  3. Form: Configure fields websiteUrl & emailAddress in your Webhook/Form node

Customization

  • AI Prompt: Tweak system message to focus on specific schema types or output style
  • Email Template: Modify HTML header/footer or add sections

Troubleshooting & Limits

  • Monitor OpenRouter rate limits and Gmail send quotas
  • Ensure target sites allow scraping for schema extraction

n8n Workflow: Generate JSON-LD Schema Markup for SEO with GPT-4 (Mini)

This n8n workflow automates the creation of JSON-LD schema markup for SEO purposes. It leverages an AI agent to generate structured data based on input provided via an n8n form. This allows for quick and efficient generation of SEO-friendly schema without manual coding.

What it does

This workflow simplifies the process of generating JSON-LD schema markup by:

  1. Triggering on Form Submission: It starts when a user submits data through a custom n8n form.
  2. Initializing an AI Agent: An AI Agent is configured to process the input and generate the desired output.
  3. Utilizing an OpenRouter Chat Model: The AI Agent uses an OpenRouter Chat Model (likely a variant of GPT-4 or similar) to understand the request and formulate the schema.
  4. Employing a Code Tool: A Code Tool is integrated, suggesting the AI might execute or generate code snippets as part of the schema creation process.
  5. Structuring Output with Parsers: The AI Agent's output is processed by an Auto-fixing Output Parser and a Structured Output Parser to ensure the generated JSON-LD is correctly formatted and valid.
  6. Generating JSON-LD Schema: The final output is a well-structured JSON-LD schema markup, ready for use on a webpage to enhance SEO.

Prerequisites/Requirements

  • n8n Instance: A running n8n instance (cloud or self-hosted).
  • OpenRouter Account & API Key: An OpenRouter account with an API key configured in n8n credentials to access their chat models.
  • Basic understanding of JSON-LD: While the workflow automates generation, understanding the basics of JSON-LD will help in providing effective prompts and verifying output.

Setup/Usage

  1. Import the Workflow: Import the provided JSON into your n8n instance.
  2. Configure Credentials:
    • Set up your OpenRouter API Key as an n8n credential. Ensure the "OpenRouter Chat Model" node is configured to use this credential.
  3. Activate the Form Trigger:
    • The "n8n Form Trigger" node will generate a unique URL when activated. This URL is where you'll submit your data to trigger the workflow.
    • You will need to define the fields for your form within the "n8n Form Trigger" node. These fields will be the input for the AI Agent (e.g., "Page Title", "Description", "Keywords", "Entity Type").
  4. Customize AI Agent Prompt (Optional but Recommended):
    • Review the "AI Agent" node. You might want to refine the prompt to guide the AI more specifically on the type of JSON-LD schema you want to generate (e.g., "Generate a 'Product' schema for the following details:", "Create an 'Article' schema for this content:").
  5. Test the Workflow:
    • Open the URL provided by the "n8n Form Trigger" in your browser.
    • Fill out the form with relevant information for which you want to generate JSON-LD.
    • Submit the form.
    • Check the execution results in n8n to see the generated JSON-LD schema markup from the "Structured Output Parser" node.
  6. Integrate Output: The generated JSON-LD can then be copied and pasted into the <head> section of your webpage, or further processed by other n8n nodes (e.g., to update a CMS, send an email, or save to a database).

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