n8n Website Uptime + SSL Expiry Monitor with Telegram Alerts

Never wonder if your website is down—get instant uptime + SSL expiry alerts in Telegram

This n8n workflow continuously monitors website uptime every 5 minutes and checks SSL certificate expiry daily at 8:00. You’ll receive Telegram notifications only when something changes—site outages/recoveries—or when an SSL certificate is nearing expiration (using Cert Spotter certificate transparency data).

What this workflow does

• Uptime monitoring (every 5 minutes): For each configured website URL, the workflow sends an HTTP request with a 10-second timeout and captures the HTTP status or network error.
• State-change alerts only: It compares the current result to the last saved state and sends a Telegram alert when a site goes down (error/timeout/status ≥ 500) or recovers.
• SSL expiry monitoring (daily at 8:00): It extracts domains from the same site list and queries Cert Spotter for the newest issued SSL certificate expiry date.
• Expiry warnings: It calculates days until expiry and sends a Telegram warning at 21 days and a critical alert at 7 days. Domains with missing certificate data are also flagged.

Use cases

• SaaS teams want automated website uptime checks with low-noise Telegram alerts.
• Operations/DevOps engineers need early warning before SSL certificates expire.
• Solo founders monitor multiple client websites without building a dedicated monitoring stack.

Technical details

• Schedule Trigger: runs every 5 minutes for uptime and daily at 8:00 for SSL checks.
• HTTP Request: checks each URL with a 10-second timeout and records HTTP status/network errors.
• Code: stores/compares last site state (static data persistence) and extracts domains for SSL queries.
• Cert Spotter: certificate transparency lookup to determine newest SSL expiry.
• Telegram: sends alerts to your chat (replace YOUR_TELEGRAM_CHAT_ID in both Telegram nodes).
• Nodes used: code, telegram, sticky note, http request, schedule trigger.

Setup notes

• Create a free Telegram bot token with @BotFather and add your Telegram credentials in n8n.
• Update the site list (one URL per line) in the workflow so it monitors the exact websites you care about.
• Activate the workflow so static data can persist up/down state between scheduled runs.