Julian Abt This workflow corresponds to n8n.io template #16221 — we link there as the canonical source.
This workflow follows the HTTP Request → Slack recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "Website Change & Uptime Monitor (no AI)",
"nodes": [
{
"id": "sticky-03-overview",
"name": "Overview & Setup",
"type": "n8n-nodes-base.stickyNote",
"position": [
-600,
-40
],
"parameters": {
"color": 3,
"width": 540,
"height": 560,
"content": "## \ud83d\udef0\ufe0f Website Change & Uptime Monitor\n\nWatches a list of URLs and posts a Slack alert only when something breaks or changes \u2014 no database, no AI.\n\n### \ud83d\udc64 Who's it for\nAnyone who wants lightweight uptime + content-change monitoring without a paid service or extra infrastructure.\n\n### \u2699\ufe0f How it works\n1. **Schedule** runs every 30 min.\n2. **Fetch Page** requests each URL (never errors on 4xx/5xx).\n3. A Code node diffs status + body against the last signature in **workflow static data**.\n4. **Slack** is messaged only for *down*, *changed* or *recovered* \u2014 quiet runs stay silent.\n\n### \ud83d\udd27 Set up (~2 min)\n- Edit the URLs in **Define URLs to Monitor** (each needs `label` + `url`).\n- Add a **Slack** credential, pick a channel, then activate.\n- First run records a baseline and sends nothing; alerts start from run two."
},
"typeVersion": 1
},
{
"id": "sticky-03-s1",
"name": "Section 1 \u00b7 Targets",
"type": "n8n-nodes-base.stickyNote",
"position": [
-10,
-40
],
"parameters": {
"color": 7,
"width": 520,
"height": 360,
"content": "### 1. Targets\nEdit the URLs to watch in **Define URLs to Monitor** \u2014 one item per page, each with a `label` and a `url`."
},
"typeVersion": 1
},
{
"id": "sticky-03-s2",
"name": "Section 2 \u00b7 Fetch",
"type": "n8n-nodes-base.stickyNote",
"position": [
650,
-40
],
"parameters": {
"color": 7,
"width": 200,
"height": 360,
"content": "### 2. Fetch\n**Fetch Page** runs once per URL with *Never Error* + *Full Response*, so a down site returns its status code instead of aborting."
},
"typeVersion": 1
},
{
"id": "sticky-03-s3",
"name": "Section 3 \u00b7 Diff & State",
"type": "n8n-nodes-base.stickyNote",
"position": [
990,
-40
],
"parameters": {
"color": 7,
"width": 540,
"height": 360,
"content": "### 3. Diff & State\nCompares each page to the last signature in **workflow static data**, then stores the new one. Emits items only for down / changed / recovered."
},
"typeVersion": 1
},
{
"id": "sticky-03-s4",
"name": "Section 4 \u00b7 Alert",
"type": "n8n-nodes-base.stickyNote",
"position": [
1650,
-40
],
"parameters": {
"color": 7,
"width": 200,
"height": 360,
"content": "### 4. Alert\nOne Slack message per problem. Quiet runs send nothing because the Code node returns zero items."
},
"typeVersion": 1
},
{
"id": "schedule-trigger",
"name": "Every 30 Minutes",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
40,
80
],
"parameters": {
"rule": {
"interval": [
{
"field": "minutes",
"minutesInterval": 30
}
]
}
},
"typeVersion": 1.3
},
{
"id": "define-urls",
"name": "Define URLs to Monitor",
"type": "n8n-nodes-base.code",
"position": [
360,
80
],
"parameters": {
"mode": "runOnceForAllItems",
"jsCode": "// Define the targets you want to watch.\n// Return ONE item per URL so the HTTP Request node fetches each one separately.\n// Edit this list: add/remove objects, change the \"label\" (shown in alerts) and \"url\".\nconst targets = [\n { label: 'Example Homepage', url: 'https://example.com' },\n { label: 'Example Pricing', url: 'https://example.com/pricing' },\n { label: 'Example Status', url: 'https://example.com/status' },\n];\n\nreturn targets.map((t) => ({ json: { label: t.label, url: t.url } }));\n",
"language": "javaScript"
},
"typeVersion": 2
},
{
"id": "fetch-page",
"name": "Fetch Page",
"type": "n8n-nodes-base.httpRequest",
"onError": "continueRegularOutput",
"position": [
700,
80
],
"parameters": {
"url": "={{ $json.url }}",
"method": "GET",
"options": {
"timeout": 15000,
"response": {
"response": {
"neverError": true,
"fullResponse": true,
"responseFormat": "text"
}
}
}
},
"typeVersion": 4.4
},
{
"id": "detect-change",
"name": "Detect Status & Content Change",
"type": "n8n-nodes-base.code",
"position": [
1040,
80
],
"parameters": {
"mode": "runOnceForAllItems",
"jsCode": "// Compares each freshly fetched page against the last version we saw and\n// emits an alert item ONLY when a site is down or its content changed.\n//\n// State is persisted in workflow static data ('global'), keyed by URL, so it\n// survives between executions without any database. On the very first run a\n// URL has no stored baseline yet -> we record it and stay silent (no alert).\n\nconst staticData = $getWorkflowStaticData('global');\n// Namespaced bucket so we never collide with other workflow state.\nif (!staticData.siteMonitor) staticData.siteMonitor = {};\nconst store = staticData.siteMonitor;\n\n// Cheap, dependency-free signature of a page body. We combine length with a\n// rolling 32-bit hash so unrelated edits of equal length still differ.\nfunction signature(text) {\n const s = String(text == null ? '' : text);\n let hash = 0;\n for (let i = 0; i < s.length; i++) {\n hash = (hash * 31 + s.charCodeAt(i)) | 0; // | 0 keeps it a 32-bit int\n }\n return s.length + ':' + (hash >>> 0).toString(16);\n}\n\nconst alerts = [];\n\nfor (const item of $input.all()) {\n const data = item.json || {};\n // 'url' / 'label' were carried through from the target item; the HTTP node\n // (fullResponse) adds statusCode + body. A network failure leaves them blank.\n const url = data.url || data.requestUrl || '';\n const label = data.label || url || 'Unknown target';\n const statusCode = typeof data.statusCode === 'number' ? data.statusCode : null;\n const body = data.body !== undefined ? data.body : data.data;\n\n // Treat a missing/error status or any 4xx/5xx as \"down\".\n const isDown = statusCode === null || statusCode >= 400;\n\n const prev = store[url];\n const newSig = isDown ? null : signature(body);\n\n let changeType = 'ok';\n let message = '';\n\n if (isDown) {\n changeType = 'down';\n const codeText = statusCode === null ? 'no response' : 'HTTP ' + statusCode;\n message = ':rotating_light: ' + label + ' is DOWN (' + codeText + ') \u2014 ' + url;\n } else if (!prev || prev.signature == null) {\n // First time we successfully see this URL: record baseline, stay silent.\n changeType = 'baseline';\n } else if (prev.signature !== newSig) {\n changeType = 'changed';\n message = ':eyes: Content changed on ' + label + ' (' + url + ')';\n } else if (prev.lastStatus === 'down') {\n // Recovery: it was down before and is healthy now \u2014 worth a heads-up.\n changeType = 'recovered';\n message = ':white_check_mark: ' + label + ' is back UP (HTTP ' + statusCode + ') \u2014 ' + url;\n }\n\n // Always update state so the next run compares against the latest version.\n store[url] = {\n signature: newSig,\n lastStatus: isDown ? 'down' : 'ok',\n statusCode: statusCode,\n lastCheckedAt: new Date().toISOString(),\n };\n\n if (changeType === 'down' || changeType === 'changed' || changeType === 'recovered') {\n alerts.push({\n json: { label, url, statusCode, changeType, message },\n });\n }\n}\n\n// Returning an empty array means the workflow simply stops here on a quiet run,\n// so no Slack message is sent unless something actually happened.\nreturn alerts;\n",
"language": "javaScript"
},
"typeVersion": 2
},
{
"id": "anything-to-report",
"name": "Anything To Report?",
"type": "n8n-nodes-base.if",
"position": [
1380,
80
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "cond-has-message",
"operator": {
"type": "string",
"operation": "exists",
"singleValue": true
},
"leftValue": "={{ $json.message }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.3
},
{
"id": "post-alert",
"name": "Post Alert",
"type": "n8n-nodes-base.slack",
"onError": "continueRegularOutput",
"maxTries": 3,
"position": [
1700,
80
],
"parameters": {
"text": "={{ $json.message }}",
"select": "channel",
"resource": "message",
"channelId": {
"__rl": true,
"mode": "name",
"value": "#alerts",
"cachedResultName": "#alerts"
},
"operation": "post",
"messageType": "text",
"otherOptions": {}
},
"retryOnFail": true,
"typeVersion": 2.4,
"waitBetweenTries": 5000
}
],
"settings": {
"executionOrder": "v1"
},
"connections": {
"Fetch Page": {
"main": [
[
{
"node": "Detect Status & Content Change",
"type": "main",
"index": 0
}
]
]
},
"Every 30 Minutes": {
"main": [
[
{
"node": "Define URLs to Monitor",
"type": "main",
"index": 0
}
]
]
},
"Anything To Report?": {
"main": [
[
{
"node": "Post Alert",
"type": "main",
"index": 0
}
],
[]
]
},
"Define URLs to Monitor": {
"main": [
[
{
"node": "Fetch Page",
"type": "main",
"index": 0
}
]
]
},
"Detect Status & Content Change": {
"main": [
[
{
"node": "Anything To Report?",
"type": "main",
"index": 0
}
]
]
}
}
}
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About this workflow
This workflow runs every 30 minutes to check a list of website URLs, detect downtime or page content changes using HTTP requests and stored workflow state, and post alerts to a Slack channel only when something goes down, changes, or recovers. Runs every 30 minutes on a…
Source: https://n8n.io/workflows/16221/ — original creator credit. Request a take-down →
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