Workflow: build automation using n8n for Schedule Removeduplicates Create Webhook
Integrations: crypto, gmail, googleDrive, googleSheets, html, httpRequest, markdown, removeDuplicates, scheduleTrigger, set, stickyNote

{"meta": {"instanceId": "408f9fb9940c3cb18ffdef0e0150fe342d6e655c3a9fac21f0f644e8bedabcd9", "templateCredsSetupCompleted": true}, "nodes": [{"id": "1083afcb-1257-45a3-b331-d93fb8769548", "name": "Schedule Trigger", "type": "n8n-nodes-base.scheduleTrigger", "position": [-840, 0], "parameters": {"rule": {"interval": [{}]}}, "typeVersion": 1.2}, {"id": "c3ec0759-a3d1-4866-978a-bfe4f49ee81d", "name": "Get Hash of Contents", "type": "n8n-nodes-base.crypto", "position": [380, 0], "parameters": {"value": "={{ $json.data }}", "dataPropertyName": "hash"}, "typeVersion": 1}, {"id": "4ad92ad3-6f99-43a5-9a61-374adb3b28f7", "name": "Notify of Change", "type": "n8n-nodes-base.gmail", "position": [1220, 0], "webhookId": "cc4cbee1-ad57-48fb-810a-b21880357ab0", "parameters": {"sendTo": "jim@example.com", "message": "=site: {{ $('Variables').first().json.url }}\ndate: {{ $now.toISO() }}\nhash: {{ $json.hash }}\ncontents: {{ $json.gdrive }}", "options": {}, "subject": "=Change detected for {{ $('Variables').first().json.url }}", "emailType": "text"}, "credentials": {"gmailOAuth2": {"id": "Sf5Gfl9NiFTNXFWb", "name": "Gmail account"}}, "typeVersion": 2.1}, {"id": "9385242a-86b1-4624-ada9-949851b68054", "name": "Markdown", "type": "n8n-nodes-base.markdown", "position": [200, 0], "parameters": {"html": "={{ $json.content.trim() }}", "options": {}}, "typeVersion": 1}, {"id": "663b6ba2-cbf9-44ea-a062-f88ccb0640c1", "name": "Variables", "type": "n8n-nodes-base.set", "position": [-460, 0], "parameters": {"options": {}, "assignments": {"assignments": [{"id": "fa706ed3-7425-4f0e-9590-d9478b4e6692", "name": "url", "type": "string", "value": "https://x.com/en/tos"}]}}, "typeVersion": 3.4}, {"id": "2ef69fff-4d7a-439a-b317-ea5fa3ce7869", "name": "Only New Hashes", "type": "n8n-nodes-base.removeDuplicates", "position": [560, 0], "parameters": {"options": {"historySize": 1}, "operation": "removeItemsSeenInPreviousExecutions", "dedupeValue": "={{ $json.hash }}"}, "typeVersion": 2}, {"id": "93e13d80-a26f-408f-be4e-b582ab9fd9bd", "name": "Log Record", "type": "n8n-nodes-base.googleSheets", "position": [1040, 0], "parameters": {"columns": {"value": {"hash": "={{ $('Get Hash of Contents').first().json.hash }}", "gdrive": "=https://drive.google.com/file/d/{{ $json.id }}/view?usp=sharing", "website": "={{ $('Variables').first().json.url }}", "date of change": "={{ $now.toISO() }}"}, "schema": [{"id": "website", "type": "string", "display": true, "required": false, "displayName": "website", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "hash", "type": "string", "display": true, "required": false, "displayName": "hash", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "date of change", "type": "string", "display": true, "required": false, "displayName": "date of change", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "gdrive", "type": "string", "display": true, "removed": false, "required": false, "displayName": "gdrive", "defaultMatch": false, "canBeUsedToMatch": true}], "mappingMode": "defineBelow", "matchingColumns": [], "attemptToConvertTypes": false, "convertFieldsToString": false}, "options": {}, "operation": "append", "sheetName": {"__rl": true, "mode": "list", "value": "gid=0", "cachedResultUrl": "https://docs.google.com/spreadsheets/d/1K13OBMicH-ebhvJRYo4sHiOuHd1KIX2jiFxBLWy2UOk/edit#gid=0", "cachedResultName": "Sheet1"}, "documentId": {"__rl": true, "mode": "list", "value": "1K13OBMicH-ebhvJRYo4sHiOuHd1KIX2jiFxBLWy2UOk", "cachedResultUrl": "https://docs.google.com/spreadsheets/d/1K13OBMicH-ebhvJRYo4sHiOuHd1KIX2jiFxBLWy2UOk/edit?usp=drivesdk", "cachedResultName": "86. Webpage Changes Tracker"}}, "credentials": {"googleSheetsOAuth2Api": {"id": "XHvC7jIRR8A2TlUl", "name": "Google Sheets account"}}, "typeVersion": 4.5}, {"id": "dea15963-61de-4371-b716-7683e0e703a9", "name": "Sticky Note", "type": "n8n-nodes-base.stickyNote", "position": [-540, -160], "parameters": {"color": 7, "width": 620, "height": 380, "content": "## 1. Fetch a Webpage Contents\n[Read more about the HTTP request node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.httprequest)"}, "typeVersion": 1}, {"id": "bcb1c0b1-fc77-4417-a9c0-6299ce8ca33e", "name": "Sticky Note1", "type": "n8n-nodes-base.stickyNote", "position": [100, -160], "parameters": {"color": 7, "width": 640, "height": 400, "content": "## 2. Use Hashing to Detect Changes\n[Learn more about the cryptography node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.crypto/)"}, "typeVersion": 1}, {"id": "eda51de6-80a2-42b1-83ba-66c551911c45", "name": "Fetch Webpage", "type": "n8n-nodes-base.httpRequest", "position": [-280, 0], "parameters": {"url": "={{ $json.url }}", "options": {}, "sendHeaders": true, "headerParameters": {"parameters": [{"name": "User-Agent", "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36"}]}}, "typeVersion": 4.2}, {"id": "8aa998f1-1558-4b54-a95a-7be9360a819a", "name": "Extract Contents", "type": "n8n-nodes-base.html", "position": [-100, 0], "parameters": {"options": {}, "operation": "extractHtmlContent", "extractionValues": {"values": [{"key": "content", "cssSelector": ".ct07", "returnValue": "html"}]}}, "typeVersion": 1.2}, {"id": "ecb60054-563c-4c0b-949c-abdcd3896f6b", "name": "Sticky Note2", "type": "n8n-nodes-base.stickyNote", "position": [760, -160], "parameters": {"color": 7, "width": 660, "height": 400, "content": "## 3. Notify when Changes Occur\n[Read more about the Gmail node](https://docs.n8n.io/integrations/builtin/app-nodes/n8n-nodes-base.gmail)\n"}, "typeVersion": 1}, {"id": "30774606-5e63-4d73-9894-ba14d5b1fc46", "name": "Take a Snapshot", "type": "n8n-nodes-base.googleDrive", "position": [860, 0], "parameters": {"name": "={{\n$('Variables').item.json.url\n  .extractDomain()\n  .replace('.','_')\n  + $json.hash\n  + '.md'\n}}", "content": "={{ $json.data }}", "driveId": {"__rl": true, "mode": "list", "value": "My Drive"}, "options": {}, "folderId": {"__rl": true, "mode": "list", "value": "1BbP5HRnjNkCvcDRFFg1bm0sNYBGZM6AU", "cachedResultUrl": "https://drive.google.com/drive/folders/1BbP5HRnjNkCvcDRFFg1bm0sNYBGZM6AU", "cachedResultName": "86. Monitor Webpage Changes"}, "operation": "createFromText"}, "credentials": {"googleDriveOAuth2Api": {"id": "yOwz41gMQclOadgu", "name": "Google Drive account"}}, "typeVersion": 3}, {"id": "9ae563ea-49a3-4dcc-9190-8746650018aa", "name": "Sticky Note3", "type": "n8n-nodes-base.stickyNote", "position": [-1040, -760], "parameters": {"width": 440, "height": 980, "content": "## Try it out\n### This n8n template can monitor and detect changes to a webpage's contents and notify you only when a change occurs.\n\nGreat to keep an eye on and track publicly available documents such as  company TOS, government policy or competitor pages.\n\n### How it works\n* A scheduled trigger is used so we can run everyday to automate this process.\n* A website page is then fetched with the HTTP request node and the contents we want to track are extracted using the HTML node.\n* To detect changes, we generate a hash on the contents with the cryptography node and compare it with previously seen hashes using the \"remove duplicates\" node. If the hash was seen before, the workflow stops here.\n* Finally, when new changes are detected a copy of the contents are uploaded to Google Drive and a logged into a Google sheet. A notification email can also be sent if action is required.\n\n### How to use\n* Update the URL you want to track in the node named \"variables\" and ensure the HTML node has updated selectors to get the content you want.\n* Ensure the timezone is set correctly when using the Scheduled Trigger node.\n\n### Need Help?\nJoin the [Discord](https://discord.com/invite/XPKeKXeB7d) or ask in the [Forum](https://community.n8n.io/)!"}, "typeVersion": 1}], "pinData": {}, "connections": {"Markdown": {"main": [[{"node": "Get Hash of Contents", "type": "main", "index": 0}]]}, "Variables": {"main": [[{"node": "Fetch Webpage", "type": "main", "index": 0}]]}, "Log Record": {"main": [[{"node": "Notify of Change", "type": "main", "index": 0}]]}, "Fetch Webpage": {"main": [[{"node": "Extract Contents", "type": "main", "index": 0}]]}, "Only New Hashes": {"main": [[{"node": "Take a Snapshot", "type": "main", "index": 0}]]}, "Take a Snapshot": {"main": [[{"node": "Log Record", "type": "main", "index": 0}]]}, "Extract Contents": {"main": [[{"node": "Markdown", "type": "main", "index": 0}]]}, "Schedule Trigger": {"main": [[{"node": "Variables", "type": "main", "index": 0}]]}, "Get Hash of Contents": {"main": [[{"node": "Only New Hashes", "type": "main", "index": 0}]]}}}