{ "id": "Twcq80VMRVqPoakz", "meta": { "templateCredsSetupCompleted": true }, "name": "Webpage Down Detector - revised", "tags": [], "nodes": [ { "id": "08dfb3ba-fa13-4aa7-bcf4-dc1cf3bbb34e", "name": "Sticky Note \u2014 Overview", "type": "n8n-nodes-base.stickyNote", "position": [ -288, -192 ], "parameters": { "width": 500, "height": 432, "content": "## Webpage Down Detector\n\nMonitors all your webpages daily and emails a detailed alert if any are down.\n\n**Features:**\n- Checks all URLs from Google Sheets\n- Retries failed URLs once to avoid false positives\n- Sends a rich HTML email with status codes & response times\n- Sends nothing if all pages are up (no noise)\n- Includes timestamp and summary stats\n\n**Setup:**\n1. Add your URLs to the Google Sheet\n2. Set your Google Sheets credentials\n3. Set your Gmail credentials\n4. Update recipient email in the Gmail node" }, "typeVersion": 1 }, { "id": "61fdaaa8-1482-4a1f-9896-2edfae21f774", "name": "Sticky Note \u2014 Step 1", "type": "n8n-nodes-base.stickyNote", "position": [ 240, -192 ], "parameters": { "color": 7, "width": 352, "height": 424, "content": "## Step 1\nRuns every day at 8am and fetches all your URLs from Google Sheets" }, "typeVersion": 1 }, { "id": "c820ef85-635a-465b-936d-30f4bc63adad", "name": "Sticky Note \u2014 Step 2", "type": "n8n-nodes-base.stickyNote", "position": [ 624, -192 ], "parameters": { "color": 7, "width": 320, "height": 424, "content": "## Step 2\nChecks each URL. If it fails, retries once after 5 seconds to avoid false positives" }, "typeVersion": 1 }, { "id": "27fee5f8-a621-4f05-a735-e98eb81d84d5", "name": "Sticky Note \u2014 Step 3", "type": "n8n-nodes-base.stickyNote", "position": [ 992, -192 ], "parameters": { "color": 7, "width": 480, "height": 424, "content": "## Step 3\nFilters down pages, checks if any exist, then sends a rich HTML alert email with full details" }, "typeVersion": 1 }, { "id": "ab8b8774-2674-4c34-93b7-56c5f232e269", "name": "Runs Every Day at 8am", "type": "n8n-nodes-base.scheduleTrigger", "position": [ 288, -16 ], "parameters": { "rule": { "interval": [ { "field": "cronExpression", "expression": "0 8 * * *" } ] } }, "typeVersion": 1.3 }, { "id": "04e9e21b-e003-4fc8-94c0-bdfbc6298afb", "name": "Fetch All Webpages", "type": "n8n-nodes-base.googleSheets", "position": [ 464, -16 ], "parameters": { "options": {}, "sheetName": { "__rl": true, "mode": "list", "value": "gid=0", "cachedResultUrl": "https://docs.google.com/spreadsheets/d/1bn40GRB-Snm7eT9buivMVY-Ba1cao7i-0wGIqHozrD4/edit#gid=0", "cachedResultName": "Sheet1" }, "documentId": { "__rl": true, "mode": "list", "value": "1bn40GRB-Snm7eT9buivMVY-Ba1cao7i-0wGIqHozrD4", "cachedResultUrl": "https://docs.google.com/spreadsheets/d/1bn40GRB-Snm7eT9buivMVY-Ba1cao7i-0wGIqHozrD4/edit?usp=drivesdk", "cachedResultName": "urls" } }, "credentials": { "googleSheetsOAuth2Api": { "name": "" } }, "typeVersion": 4.7 }, { "id": "3f42dab3-c215-42b8-aeca-d59af98b2079", "name": "Check All Webpages (with Retry)", "type": "n8n-nodes-base.code", "position": [ 752, -16 ], "parameters": { "jsCode": "// Check each URL and retry once if it fails\n// Records status code and response time\n\nasync function fetchStatus(url) {\n const start = Date.now();\n try {\n await this.helpers.request({\n method: 'GET',\n url: url,\n timeout: 10000,\n rejectUnauthorized: false,\n });\n return { status: 200, responseTime: Date.now() - start };\n } catch (error) {\n return { status: error.statusCode || 'ERROR', responseTime: Date.now() - start };\n }\n}\n\nasync function sleep(ms) {\n return new Promise(resolve => setTimeout(resolve, ms));\n}\n\nconst results = await Promise.all(\n items.map(async (item) => {\n const url = item.json.URL;\n if (!url) return null;\n\n // First attempt\n let result = await fetchStatus.call(this, url);\n\n // Retry once if failed\n const isDown = result.status === 'ERROR' || (typeof result.status === 'number' && (result.status < 200 || result.status >= 400));\n if (isDown) {\n await sleep(5000); // wait 5 seconds before retry\n result = await fetchStatus.call(this, url);\n }\n\n const stillDown = result.status === 'ERROR' || (typeof result.status === 'number' && (result.status < 200 || result.status >= 400));\n\n return {\n json: {\n URL: url,\n status: result.status,\n responseTime: result.responseTime,\n isDown: stillDown,\n retried: isDown\n }\n };\n })\n);\n\nreturn results.filter(r => r !== null);\n" }, "typeVersion": 2 }, { "id": "6dfa15f9-bb03-4a46-b800-42a11143bf84", "name": "Filter Down Webpages", "type": "n8n-nodes-base.code", "position": [ 1088, -16 ], "parameters": { "jsCode": "// Separate down pages from up pages\n// Pass both counts forward for the summary email\n\nconst allPages = items.map(i => i.json);\nconst downPages = allPages.filter(p => p.isDown);\nconst upCount = allPages.length - downPages.length;\n\nif (downPages.length === 0) {\n // Return special flag so next node can stop the workflow\n return [{ json: { hasDownPages: false, totalMonitored: allPages.length, downCount: 0, upCount } }];\n}\n\nreturn [{\n json: {\n hasDownPages: true,\n totalMonitored: allPages.length,\n downCount: downPages.length,\n upCount,\n downPages,\n checkedAt: new Date().toLocaleString('en-AU', { timeZone: 'Australia/Sydney' })\n }\n}];\n" }, "typeVersion": 2 }, { "id": "1dece255-57b7-4078-a606-ee38db428c14", "name": "Any Pages Down?", "type": "n8n-nodes-base.if", "position": [ 1312, -16 ], "parameters": { "options": {}, "conditions": { "options": { "leftValue": "", "caseSensitive": true, "typeValidation": "strict" }, "combinator": "and", "conditions": [ { "id": "check-down", "operator": { "type": "boolean", "operation": "equals" }, "leftValue": "={{ $json.hasDownPages }}", "rightValue": true } ] } }, "typeVersion": 2 }, { "id": "26de92a6-f8fc-49d5-a2bf-c392b28d1e29", "name": "Compose HTML Email", "type": "n8n-nodes-base.code", "position": [ 1584, -80 ], "parameters": { "jsCode": "const data = $input.first().json;\nconst { downPages, totalMonitored, downCount, upCount, checkedAt } = data;\n\n// Build table rows for each down page\nconst rows = downPages.map(page => {\n const statusLabel = page.status === 'ERROR' ? '\u26a0\ufe0f ERROR' : `\u274c ${page.status}`;\n const retryNote = page.retried ? '(confirmed after retry)' : '';\n return `\n \n \n ${page.URL}\n \n ${statusLabel}\n ${page.responseTime}ms ${retryNote}\n `;\n}).join('');\n\nconst html = `\n\n\n\n
\n \n \n
\n

\ud83d\udea8 Webpage Down Alert

\n

Checked at ${checkedAt} (AEST)

\n
\n\n \n
\n \n \n \n \n \n \n
\n
${downCount}
\n
Pages Down
\n 		\n
${upCount}
\n
Pages Up
\n 		\n
${totalMonitored}
\n
Total Monitored
\n
\n
\n\n \n
\n

Down Pages Details

\n \n \n \n \n \n \n \n \n ${rows}\n
URLStatusResponse Time
\n
\n\n \n
\n

This alert was sent automatically by your n8n Webpage Monitor. All failed URLs were retried once before alerting.

\n
\n
\n\n`;\n\nreturn [{ json: { html, subject: `\ud83d\udea8 ${downCount} Webpage(s) Down \u2014 ${checkedAt}` } }];\n" }, "typeVersion": 2 }, { "id": "591794ee-7b72-42c1-a13a-17b9dfcae146", "name": "Send Alert Email", "type": "n8n-nodes-base.gmail", "position": [ 1792, -80 ], "parameters": { "sendTo": "user@example.com", "message": "={{ $json.html }}", "options": {}, "subject": "={{ $json.subject }}" }, "credentials": { "gmailOAuth2": { "name": "" } }, "typeVersion": 2.1 }, { "id": "35ed5b33-ba6d-4477-afd8-97a325e03c09", "name": "Sticky Note \u2014 Step ", "type": "n8n-nodes-base.stickyNote", "position": [ 1520, -192 ], "parameters": { "color": 7, "width": 480, "height": 424, "content": "## Step 4\nCompose and send email" }, "typeVersion": 1 }, { "id": "bb6d3dce-b34b-4328-88f2-947e5e3e13c0", "name": "All Pages Up - Stop", "type": "n8n-nodes-base.noOp", "position": [ 1584, 80 ], "parameters": {}, "typeVersion": 1 } ], "active": false, "settings": { "executionOrder": "v1" }, "versionId": "bae47254-fd29-44a8-acd4-96176d8d44ed", "connections": { "Any Pages Down?": { "main": [ [ { "node": "Compose HTML Email", "type": "main", "index": 0 } ], [ { "node": "All Pages Up - Stop", "type": "main", "index": 0 } ] ] }, "Compose HTML Email": { "main": [ [ { "node": "Send Alert Email", "type": "main", "index": 0 } ] ] }, "Fetch All Webpages": { "main": [ [ { "node": "Check All Webpages (with Retry)", "type": "main", "index": 0 } ] ] }, "Filter Down Webpages": { "main": [ [ { "node": "Any Pages Down?", "type": "main", "index": 0 } ] ] }, "Runs Every Day at 8am": { "main": [ [ { "node": "Fetch All Webpages", "type": "main", "index": 0 } ] ] }, "Check All Webpages (with Retry)": { "main": [ [ { "node": "Filter Down Webpages", "type": "main", "index": 0 } ] ] } } }