SSL Certificate Expiry Monitor with Google Sheets & Email Alerts

This n8n workflow monitors SSL certificates for a list of websites stored in a Google Sheet. It runs every Monday at 7:00 AM, fetching the website URLs, querying the ssl-checker.io API for each site's certificate details including issue and expiry dates, and updating the sheet with the latest information. It then filters for certificates expiring within 14 days and sends targeted email alerts to prevent downtime, security risks, and trust warnings.

Key benefits include proactive security management, reduced manual monitoring efforts, and seamless integration with existing Google Sheets for easy data management. The workflow handles multiple sites efficiently, making it ideal for IT teams, DevOps, or anyone managing web assets.

Use cases: IT departments tracking domain portfolios, web agencies monitoring client sites, e-commerce businesses ensuring secure checkouts, or security auditors automating compliance checks. Fully configurable for custom schedules, thresholds, and alert recipients.