Webpage Change Detection & Alerts with Google Suite and Hash Tracking

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        "value": "={{ $json.data }}",
        "dataPropertyName": "hash"
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      "name": "Notify of Change",
      "type": "n8n-nodes-base.gmail",
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      "webhookId": "cc4cbee1-ad57-48fb-810a-b21880357ab0",
      "parameters": {
        "sendTo": "[email protected]",
        "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"
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      "parameters": {
        "options": {
          "historySize": 1
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        "operation": "removeItemsSeenInPreviousExecutions",
        "dedupeValue": "={{ $json.hash }}"
      },
      "typeVersion": 2
    },
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      "id": "93e13d80-a26f-408f-be4e-b582ab9fd9bd",
      "name": "Log Record",
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      "position": [
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      "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
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            {
              "id": "date of change",
              "type": "string",
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              "required": false,
              "displayName": "date of change",
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      "parameters": {
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        "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)"
      },
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      "parameters": {
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        "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/)"
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        "url": "={{ $json.url }}",
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              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36"
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          ]
        }
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        "operation": "extractHtmlContent",
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        "content": "## 3. Notify when Changes Occur\n[Read more about the Gmail node](https://docs.n8n.io/integrations/builtin/app-nodes/n8n-nodes-base.gmail)\n"
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        "name": "={{\n$('Variables').item.json.url\n  .extractDomain()\n  .replace('.','_')\n  + $json.hash\n  + '.md'\n}}",
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        "driveId": {
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          "mode": "list",
          "value": "My Drive"
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          "mode": "list",
          "value": "1BbP5HRnjNkCvcDRFFg1bm0sNYBGZM6AU",
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        "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/)!"
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