Vitaliy Voitik This workflow corresponds to n8n.io template #18059 — we link there as the canonical source.
This workflow follows the HTTP Request → Telegram recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "Monitor website uptime and SSL expiry with Telegram alerts",
"nodes": [
{
"id": "ddae4eeb-8abe-498a-aa08-fef9f4bede0d",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-848,
-256
],
"parameters": {
"width": 480,
"height": 832,
"content": "## Monitor website uptime and SSL expiry with Telegram alerts\n\n### How it works\n\nThis workflow monitors configured websites through two parallel scheduled checks. Every five minutes it verifies uptime and sends Telegram alerts only when a site's state changes. Once per day it checks SSL certificate expiry dates and alerts when certificates approach warning or critical thresholds.\n\n### Setup steps\n\n- Edit the site/domain list in the code node labeled \"Sites to Watch\" so it contains the URLs or domains you want to monitor.\n- Configure Telegram credentials and the target chat ID in both Telegram alert nodes.\n- Verify the HTTP request settings for the uptime check, including timeout and error handling behavior.\n- Confirm the certificate lookup endpoint works for your domains and add any required Cert Spotter/API credentials or headers if your usage requires them.\n- Activate the workflow so both schedule triggers run automatically.\n\n### Customization\n\nAdjust the schedule intervals, uptime request timeout, SSL warning thresholds of 21 and 7 days, and Telegram message text to match your monitoring policy."
},
"typeVersion": 1
},
{
"id": "4ff84d40-8e49-45bd-ad77-471ee63970fb",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-288,
-240
],
"parameters": {
"color": 7,
"width": 640,
"height": 320,
"content": "## Uptime polling setup\n\nRuns every five minutes, expands the configured website list, and performs an HTTP GET request for each URL to determine its current availability."
},
"typeVersion": 1
},
{
"id": "b250a37a-9a02-4de4-8a87-6648dbb332e7",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
400,
-256
],
"parameters": {
"color": 7,
"width": 416,
"height": 336,
"content": "## Uptime change alerts\n\nCompares each current site result with the previous run and sends a Telegram message only when a site changes state, such as going down or recovering."
},
"typeVersion": 1
},
{
"id": "be563afa-a773-44b0-9e05-4ed17676d7e9",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
-288,
112
],
"parameters": {
"color": 7,
"width": 640,
"height": 304,
"content": "## Daily SSL lookup\n\nRuns each morning, prepares the domains to inspect, and calls the certificate information API for each domain."
},
"typeVersion": 1
},
{
"id": "951f1353-6143-4994-a8c3-fa763e6f015b",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
400,
112
],
"parameters": {
"color": 7,
"width": 416,
"height": 320,
"content": "## SSL expiry alerts\n\nEvaluates certificate expiry dates, flags warning and critical thresholds or failed checks, and sends relevant Telegram notifications."
},
"typeVersion": 1
},
{
"id": "node-uptime-schedule",
"name": "When Every 5 Minutes",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
-240,
-80
],
"parameters": {
"rule": {
"interval": [
{
"field": "minutes",
"minutesInterval": 5
}
]
}
},
"typeVersion": 1.2
},
{
"id": "node-site-list",
"name": "Prepare Site URLs",
"type": "n8n-nodes-base.code",
"position": [
-20,
-80
],
"parameters": {
"jsCode": "// ONE URL PER LINE. Edit this list and nothing else.\nconst SITES = `\nhttps://example.com\nhttps://example.org\n`;\n\nreturn SITES.split('\\n')\n .map(s => s.trim())\n .filter(s => s.length > 0)\n .map(url => ({ json: { url } }));"
},
"typeVersion": 2
},
{
"id": "node-http-check",
"name": "Get Site Status",
"type": "n8n-nodes-base.httpRequest",
"onError": "continueRegularOutput",
"position": [
200,
-80
],
"parameters": {
"url": "={{ $json.url }}",
"options": {
"timeout": 10000,
"redirect": {
"redirect": {
"maxRedirects": 5,
"followRedirects": true
}
},
"response": {
"response": {
"neverError": true,
"fullResponse": true
}
}
}
},
"typeVersion": 4.2
},
{
"id": "node-detect-changes",
"name": "Check for Status Change",
"type": "n8n-nodes-base.code",
"position": [
448,
-80
],
"parameters": {
"jsCode": "// Compare current status with the previous run and emit alerts ONLY on state changes.\n// Requires the workflow to be Active (static data does not persist in manual runs).\n\nconst state = $getWorkflowStaticData('global');\nif (!state.siteStatus) state.siteStatus = {};\n\nconst sites = $('Prepare Site URLs').all();\nconst results = $input.all();\nconst alerts = [];\n\nfor (let i = 0; i < results.length; i++) {\n const url = sites[i] ? sites[i].json.url : 'unknown';\n const r = results[i].json;\n\n const status = typeof r.statusCode === 'number' ? r.statusCode : 0;\n const failed = r.error !== undefined || status === 0 || status >= 500;\n const now = failed ? 'down' : 'up';\n const before = state.siteStatus[url] || 'up';\n\n if (now !== before) {\n const reason = r.error\n ? String(r.error.message || r.error).slice(0, 140)\n : `HTTP ${status}`;\n alerts.push({\n json: {\n text: now === 'down'\n ? `\ud83d\udd34 DOWN: ${url}\\nReason: ${reason}\\nTime: ${new Date().toISOString()}`\n : `\ud83d\udfe2 RECOVERED: ${url}\\nTime: ${new Date().toISOString()}`,\n },\n });\n }\n state.siteStatus[url] = now;\n}\n\nreturn alerts;"
},
"typeVersion": 2
},
{
"id": "node-telegram-uptime",
"name": "Notify Site Status Change",
"type": "n8n-nodes-base.telegram",
"position": [
672,
-80
],
"parameters": {
"text": "={{ $json.text }}",
"chatId": "YOUR_TELEGRAM_CHAT_ID",
"additionalFields": {}
},
"typeVersion": 1.2
},
{
"id": "node-ssl-schedule",
"name": "When Every Morning at 8AM",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
-240,
256
],
"parameters": {
"rule": {
"interval": [
{
"field": "days",
"triggerAtHour": 8
}
]
}
},
"typeVersion": 1.2
},
{
"id": "node-domain-list",
"name": "Prepare Domain List",
"type": "n8n-nodes-base.code",
"position": [
-16,
256
],
"parameters": {
"jsCode": "// Reuses the same list as the uptime loop - keeps config in ONE place.\nconst SITES = `\nhttps://example.com\nhttps://example.org\n`;\n\nreturn SITES.split('\\n')\n .map(s => s.trim())\n .filter(s => s.length > 0)\n .map(url => ({ json: { domain: url.replace(/^https?:\\/\\//, '').replace(/\\/.*$/, '') } }));"
},
"typeVersion": 2
},
{
"id": "node-ssl-api",
"name": "Get SSL Certificate Info",
"type": "n8n-nodes-base.httpRequest",
"onError": "continueRegularOutput",
"position": [
208,
256
],
"parameters": {
"url": "=https://api.certspotter.com/v1/issuances?domain={{ $json.domain }}&include_subdomains=false&expand=not_after",
"options": {
"timeout": 15000
}
},
"typeVersion": 4.2
},
{
"id": "node-ssl-eval",
"name": "Check SSL Expiry",
"type": "n8n-nodes-base.code",
"position": [
448,
272
],
"parameters": {
"jsCode": "// Warn at 21 days before expiry, critical at 7. Also flags failed checks.\n// Data source: Cert Spotter CT logs (free, no key). We take the NEWEST issued\n// certificate per domain. If a renewed cert was issued but never deployed,\n// the 5-minute uptime loop still catches the broken TLS as DOWN.\nconst WARN_DAYS = 21;\nconst CRITICAL_DAYS = 7;\n\nconst domains = $('Prepare Domain List').all();\nconst results = $input.all();\nconst alerts = [];\nconst now = Date.now();\n\nfor (let i = 0; i < results.length; i++) {\n const domain = domains[i] ? domains[i].json.domain : 'unknown';\n const r = results[i].json;\n\n const issuances = Array.isArray(r) ? r : (Array.isArray(r.data) ? r.data : null);\n if (r.error !== undefined || !issuances || issuances.length === 0) {\n alerts.push({ json: { text: `\u26a0\ufe0f SSL check failed for ${domain} - no certificate data returned. Check the site manually.` } });\n continue;\n }\n\n let latest = 0;\n for (const cert of issuances) {\n const t = Date.parse(cert.not_after);\n if (!Number.isNaN(t) && t > latest) latest = t;\n }\n if (latest === 0) continue;\n\n const days = Math.floor((latest - now) / 86400000);\n const till = new Date(latest).toISOString().slice(0, 10);\n\n if (days <= CRITICAL_DAYS) {\n alerts.push({ json: { text: `\ud83d\udea8 SSL CRITICAL: newest certificate for ${domain} expires in ${days} day(s) (${till}). Renew NOW.` } });\n } else if (days <= WARN_DAYS) {\n alerts.push({ json: { text: `\u26a0\ufe0f SSL warning: newest certificate for ${domain} expires in ${days} days (${till}).` } });\n }\n}\n\nreturn alerts;"
},
"typeVersion": 2
},
{
"id": "node-telegram-ssl",
"name": "Notify SSL Expiry Alert",
"type": "n8n-nodes-base.telegram",
"position": [
672,
272
],
"parameters": {
"text": "={{ $json.text }}",
"chatId": "YOUR_TELEGRAM_CHAT_ID",
"additionalFields": {}
},
"typeVersion": 1.2
},
{
"id": "sticky-42",
"name": "Sticky Note \u2014 Pro Version",
"type": "n8n-nodes-base.stickyNote",
"position": [
-848,
624
],
"parameters": {
"color": 4,
"width": 480,
"height": 400,
"content": "### \ud83d\ude80 Want real monitoring?\n\nThis template covers the basics. I run production monitoring for a living and build extended versions: **Zabbix-grade checks** (keywords on page, response time budgets, DNS, ports), **multi-channel escalation** (Telegram \u2192 SMS \u2192 phone), **status pages**, backup and disk-space monitoring for the same server that runs your n8n.\n\nAsync delivery, no calls \u2014 contact links in my creator profile."
},
"typeVersion": 1
}
],
"settings": {
"executionOrder": "v1"
},
"connections": {
"Get Site Status": {
"main": [
[
{
"node": "Check for Status Change",
"type": "main",
"index": 0
}
]
]
},
"Check SSL Expiry": {
"main": [
[
{
"node": "Notify SSL Expiry Alert",
"type": "main",
"index": 0
}
]
]
},
"Prepare Site URLs": {
"main": [
[
{
"node": "Get Site Status",
"type": "main",
"index": 0
}
]
]
},
"Prepare Domain List": {
"main": [
[
{
"node": "Get SSL Certificate Info",
"type": "main",
"index": 0
}
]
]
},
"When Every 5 Minutes": {
"main": [
[
{
"node": "Prepare Site URLs",
"type": "main",
"index": 0
}
]
]
},
"Check for Status Change": {
"main": [
[
{
"node": "Notify Site Status Change",
"type": "main",
"index": 0
}
]
]
},
"Get SSL Certificate Info": {
"main": [
[
{
"node": "Check SSL Expiry",
"type": "main",
"index": 0
}
]
]
},
"When Every Morning at 8AM": {
"main": [
[
{
"node": "Prepare Domain List",
"type": "main",
"index": 0
}
]
]
}
}
}
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About this workflow
This workflow monitors website uptime every 5 minutes and SSL certificate expiry daily at 8:00, sending Telegram alerts only when a site changes state (down/recovered) or when a certificate is nearing expiration using Cert Spotter certificate transparency data. Runs every 5…
Source: https://n8n.io/workflows/18059/ — original creator credit. Request a take-down →
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