Audit & Generate JSON-LD Schema Markup for SEO with GPT-4.1-mini + Gmail

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