Monitor SSL certificate expiry dates with Google Sheets & Slack alerts


This n8n workflow illustrates how to monitor and track SSL certificate expiration dates for any domain using the SSL Checker node from [customJS](https://www.customjs.space). It automatically updates a Google Sheet with the number of days left until expiry and sends a Slack notification when certificates are about to expire.

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What this workflow does

- Input a list of domains from Google Sheets. - Check each domain’s SSL certificate details, including expiration date and days left. - Update the Google Sheet with the latest SSL expiry information. - Notify via Slack if any certificate is expiring soon (e.g., less than 8 days).

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Requirements

- CustomJS API key for SSL checking. - Google Sheets API credentials for reading/updating domain data. - Slack API credentials (optional, for notifications).