The workflow JSON
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{
"nodes": [
{
"name": "HTML Extract",
"type": "n8n-nodes-base.htmlExtract",
"position": [
-220,
-390
],
"parameters": {
"options": {},
"extractionValues": {
"values": [
{
"key": "price",
"cssSelector": "={{$node[\"initItem\"].json[\"selector\"]}}"
}
]
}
},
"typeVersion": 1
},
{
"name": "Cron",
"type": "n8n-nodes-base.cron",
"position": [
-1290,
-390
],
"parameters": {
"triggerTimes": {
"item": [
{
"mode": "everyX",
"unit": "minutes",
"value": 15
}
]
}
},
"typeVersion": 1
},
{
"name": "getActualPrice",
"type": "n8n-nodes-base.functionItem",
"position": [
-20,
-390
],
"parameters": {
"functionCode": "const globalData = getWorkflowStaticData('global');\n\nvar price = String(item.price).replace(\",\", \".\");\nprice = parseFloat(price);\n//price = price.replace(/\\D/g, '');\n//item.price = String(item.price).replace(\",\", \".\");\n//item.price = parseFloat(item.price);\n\nitem.priceExists = (price > 0 ? true : false)\nitem.price = price;\n\n// Update its data\nglobalData.actualPrice = item;\n\nreturn item;"
},
"typeVersion": 1
},
{
"name": "fetchWeb",
"type": "n8n-nodes-base.httpRequest",
"position": [
-410,
-390
],
"parameters": {
"url": "={{$node[\"initItem\"].json[\"link\"]}}",
"options": {},
"responseFormat": "string"
},
"typeVersion": 1
},
{
"name": "FunctionItem",
"type": "n8n-nodes-base.functionItem",
"position": [
1020,
-390
],
"parameters": {
"functionCode": "const globalData = getWorkflowStaticData('global');\n\nglobalData.iteration = 0;\n//var thiselem = $node[\"initItem\"].json;\n\n//const s1 = {'slug': thiselem.slug, \"link\": thiselem.link, \"selector\": thiselem.selector, \"price\":$node[\"getActualPrice\"].json.price, \"currency\": thiselem.currency};\n//const s2 = {'slug': thiselem.slug+'2', \"link\": thiselem.link, \"selector\": thiselem.selector, \"price\":$node[\"getActualPrice\"].json.price, \"currency\": thiselem.currency};\n//const s3 = {'slug': thiselem.slug+'3', \"link\": thiselem.link, \"selector\": thiselem.selector, \"price\":$node[\"getActualPrice\"].json.price, \"currency\": thiselem.currency};\n\nreturn $node[\"changeME\"].json.myWatchers;\n"
},
"typeVersion": 1
},
{
"name": "Write Binary File1",
"type": "n8n-nodes-base.writeBinaryFile",
"position": [
1850,
-390
],
"parameters": {
"fileName": "/data/kopacky.json",
"dataPropertyName": "=price"
},
"typeVersion": 1
},
{
"name": "Move Binary Data1",
"type": "n8n-nodes-base.moveBinaryData",
"position": [
1420,
-390
],
"parameters": {
"mode": "jsonToBinary",
"options": {},
"destinationKey": "price"
},
"typeVersion": 1
},
{
"name": "IF1",
"type": "n8n-nodes-base.if",
"position": [
550,
-370
],
"parameters": {
"conditions": {
"string": [
{
"value1": "={{$node[\"checkifexists\"].json[\"stdout\"]}}",
"value2": "Exists",
"operation": "notEqual"
}
]
}
},
"typeVersion": 1
},
{
"name": "checkifexists",
"type": "n8n-nodes-base.executeCommand",
"position": [
410,
-370
],
"parameters": {
"command": "if [ -r /data/kopacky.json ]; then echo Exists; fi"
},
"typeVersion": 1
},
{
"name": "IF3",
"type": "n8n-nodes-base.if",
"position": [
680,
110
],
"parameters": {
"conditions": {
"string": [
{
"value1": "={{$node[\"checkifexists\"].json[\"stdout\"]}}",
"value2": "Exists"
}
]
}
},
"typeVersion": 1
},
{
"name": "SaveToFile",
"type": "n8n-nodes-base.writeBinaryFile",
"position": [
1650,
110
],
"parameters": {
"fileName": "/data/kopacky.json",
"dataPropertyName": "=price"
},
"typeVersion": 1
},
{
"name": "JsonToBinary",
"type": "n8n-nodes-base.moveBinaryData",
"position": [
1500,
110
],
"parameters": {
"mode": "jsonToBinary",
"options": {},
"destinationKey": "price"
},
"typeVersion": 1
},
{
"name": "changeME",
"type": "n8n-nodes-base.functionItem",
"color": "#3BDD33",
"position": [
-830,
-390
],
"parameters": {
"functionCode": "const globalData = getWorkflowStaticData('global');\n\n//{'slug': 'kopacky', 'link': 'https://www.adsport.sk/kopacky-lisovky-adidas-x-19-3-ll-fg-ef0598/#1131861', 'currency': 'EUR'}[]\nvar myWatchers = [\n{'slug': 'kopacky', 'link': 'https://www.adsport.sk/kopacky-lisovky-adidas-x-19-3-ll-fg-ef0598/#1131861', 'selector':'.prices > strong:nth-child(1) > span:nth-child(1)', 'currency': 'EUR'},\n{'slug': 'kopacky2', 'link': 'https://www.adsport.sk/turfy-adidas-ace-tango-17-3-tf-by2203/', 'selector':'.col-xs-4 > strong:nth-child(1) > span:nth-child(1)', 'currency': 'EUR'},\n{'slug': 'mobilcek', 'link': 'https://mobil.bazos.sk/inzerat/112253662/predam-odolny-doogee-s60-52-4g-lte-nfc.php', 'selector':'.listadvlevo > table:nth-child(1) > tbody:nth-child(1) > tr:nth-child(5) > td:nth-child(2) > b:nth-child(2)', 'currency': 'EUR'},\n{'slug': 'ADIZERO RC 2', 'link': 'https://www.adsport.sk/panske-bezecke-topanky-adidas-adizero-rc-2-eg1187/', 'selector':'.col-xs-4 > strong:nth-child(1) > span:nth-child(1)', 'currency': 'EUR'}\n];\n\nitem.myWatchers = myWatchers;\nitem.watchersCount = myWatchers.length;\nglobalData.myWatchers = myWatchers;\n\nreturn item;"
},
"typeVersion": 1
},
{
"name": "initItem",
"type": "n8n-nodes-base.functionItem",
"position": [
-620,
-390
],
"parameters": {
"functionCode": "const globalData = getWorkflowStaticData('global');\n\nvar counter = globalData.iteration;\n\nitem.myWatchers[counter].watchersCount = item.watchersCount;\nitem.myWatchers[counter].canContinue = (globalData.iteration < item.watchersCount-1 ? true : false);\n//item.myWatchers[counter].canContinue = false;\n\nglobalData.iteration = counter + 1;\n\nreturn item.myWatchers[counter];"
},
"typeVersion": 1
},
{
"name": "savedItems",
"type": "n8n-nodes-base.readBinaryFile",
"position": [
850,
-20
],
"parameters": {
"filePath": "/data/kopacky.json",
"dataPropertyName": "savedItems"
},
"typeVersion": 1,
"continueOnFail": true,
"alwaysOutputData": true
},
{
"name": "itemsToJSON",
"type": "n8n-nodes-base.moveBinaryData",
"position": [
1020,
-20
],
"parameters": {
"options": {},
"sourceKey": "savedItems"
},
"typeVersion": 1
},
{
"name": "IF",
"type": "n8n-nodes-base.if",
"position": [
2190,
-90
],
"parameters": {
"conditions": {
"string": [],
"boolean": [
{
"value1": "={{$node[\"initItem\"].json[\"canContinue\"]}}",
"value2": true
}
]
}
},
"typeVersion": 1
},
{
"name": "initItem1",
"type": "n8n-nodes-base.functionItem",
"position": [
-1060,
-390
],
"parameters": {
"functionCode": "const globalData = getWorkflowStaticData('global');\n\nglobalData.iteration = 0;\n\nreturn item;"
},
"typeVersion": 1
},
{
"name": "IF2",
"type": "n8n-nodes-base.if",
"position": [
1850,
110
],
"parameters": {
"conditions": {
"number": [
{
"value1": "={{$node[\"getActualPrice\"].json[\"price\"]}}",
"value2": "={{$node[\"updateSavedItems1\"].json[\"oldPrice\"]}}"
}
],
"string": []
}
},
"typeVersion": 1
},
{
"name": "updateSavedItems",
"type": "n8n-nodes-base.functionItem",
"position": [
1350,
110
],
"parameters": {
"functionCode": "const globalData = getWorkflowStaticData('global');\n\nvar myitems = [];\nvar i;\nfor (i = 0; i < item.items.length; i++) { \n if($node[\"initItem\"].json.slug == item.items[i].slug && $node[\"getActualPrice\"].json.price < item.items[i].price) {\n item.items[i].price = $node[\"getActualPrice\"].json.price;\n }\n myitems.push(item.items[i]);\n} \n\nreturn myitems;\n"
},
"typeVersion": 1
},
{
"name": "updateSavedItems1",
"type": "n8n-nodes-base.functionItem",
"position": [
1200,
-20
],
"parameters": {
"functionCode": "const globalData = getWorkflowStaticData('global');\nvar oldPrice = null;\nvar myitems = [];\nvar i;\nfor (i = 0; i < item.length; i++) {\n if($node[\"initItem\"].json.slug == item[i].slug) {\n\n item[i].link = $node[\"initItem\"].json.link;\n item[i].selector = $node[\"initItem\"].json.selector;\n item[i].currency = $node[\"initItem\"].json.currency;\n \n if(!item[i].price){\n item[i].price = $node[\"getActualPrice\"].json.price;\n }\n \n if($node[\"getActualPrice\"].json.price < item[i].price){\n oldPrice = item[i].price;\n item[i].price = $node[\"getActualPrice\"].json.price;\n }\n \n \n }\n \n myitems.push(item[i]);\n} \n\n//item.somar = $node[\"initItem\"].json;\n//return globalData.actualPrice;\n\nvar itemm = {};\nitemm.items = myitems;\nitemm.oldPrice = oldPrice;\nreturn itemm;\n"
},
"typeVersion": 1
},
{
"name": "cleanData",
"type": "n8n-nodes-base.executeCommand",
"notes": "This will remove all storaged data.",
"position": [
-1290,
-560
],
"parameters": {
"command": "file=\"/data/kopacky.json\"\n[ -f $file ] && rm $file"
},
"typeVersion": 1
},
{
"name": "IF4",
"type": "n8n-nodes-base.if",
"position": [
150,
-390
],
"parameters": {
"conditions": {
"string": [],
"boolean": [
{
"value1": "={{$node[\"getActualPrice\"].json[\"priceExists\"]}}"
}
]
}
},
"typeVersion": 1
},
{
"name": "NotifyBetterPrice",
"type": "n8n-nodes-base.emailSend",
"position": [
1850,
-90
],
"parameters": {
"html": "=<h2>Nov\u00e1 cena je: {{$node[\"getActualPrice\"].json[\"price\"]}} {{$node[\"initItem\"].json[\"currency\"]}}</h2><br>\nP\u00f4vodn\u00e1 cena bola: {{$node[\"updateSavedItems1\"].json[\"oldPrice\"]}} {{$node[\"initItem\"].json[\"currency\"]}}<br>\nURL: {{$node[\"initItem\"].json[\"link\"]}}",
"text": "=",
"options": {},
"subject": "=Nov\u00e1 cena - {{$node[\"initItem\"].json[\"slug\"]}} - {{$node[\"getActualPrice\"].json[\"price\"]}} {{$node[\"initItem\"].json[\"currency\"]}}",
"toEmail": "sthosstudio@gmail.com",
"fromEmail": "hostovecky@weyou.sk"
},
"credentials": {
"smtp": "<your credential>"
},
"typeVersion": 1
},
{
"name": "NotifyIncorrectPrice",
"type": "n8n-nodes-base.emailSend",
"position": [
270,
-690
],
"parameters": {
"html": "=Please check the link or selector for the item with slug <strong>{{$node[\"initItem\"].json[\"slug\"]}}</strong><br>\nURL: {{$node[\"initItem\"].json[\"link\"]}}",
"text": "=",
"options": {},
"subject": "={{$node[\"initItem\"].json[\"slug\"]}} - Getting price issue.",
"toEmail": "sthosstudio@gmail.com",
"fromEmail": "hostovecky@weyou.sk"
},
"credentials": {
"smtp": "<your credential>"
},
"typeVersion": 1
}
],
"connections": {
"IF": {
"main": [
[
{
"node": "changeME",
"type": "main",
"index": 0
}
]
]
},
"IF1": {
"main": [
[
{
"node": "FunctionItem",
"type": "main",
"index": 0
}
],
[
{
"node": "IF3",
"type": "main",
"index": 0
}
]
]
},
"IF2": {
"main": [
[
{
"node": "NotifyBetterPrice",
"type": "main",
"index": 0
}
],
[
{
"node": "IF",
"type": "main",
"index": 0
}
]
]
},
"IF3": {
"main": [
[
{
"node": "savedItems",
"type": "main",
"index": 0
}
]
]
},
"IF4": {
"main": [
[
{
"node": "NotifyIncorrectPrice",
"type": "main",
"index": 0
}
],
[
{
"node": "checkifexists",
"type": "main",
"index": 0
}
]
]
},
"Cron": {
"main": [
[
{
"node": "initItem1",
"type": "main",
"index": 0
}
]
]
},
"changeME": {
"main": [
[
{
"node": "initItem",
"type": "main",
"index": 0
}
]
]
},
"fetchWeb": {
"main": [
[
{
"node": "HTML Extract",
"type": "main",
"index": 0
}
]
]
},
"initItem": {
"main": [
[
{
"node": "fetchWeb",
"type": "main",
"index": 0
}
]
]
},
"initItem1": {
"main": [
[
{
"node": "changeME",
"type": "main",
"index": 0
}
]
]
},
"SaveToFile": {
"main": [
[
{
"node": "IF2",
"type": "main",
"index": 0
}
]
]
},
"savedItems": {
"main": [
[
{
"node": "itemsToJSON",
"type": "main",
"index": 0
}
]
]
},
"itemsToJSON": {
"main": [
[
{
"node": "updateSavedItems1",
"type": "main",
"index": 0
}
]
]
},
"FunctionItem": {
"main": [
[
{
"node": "Move Binary Data1",
"type": "main",
"index": 0
}
]
]
},
"HTML Extract": {
"main": [
[
{
"node": "getActualPrice",
"type": "main",
"index": 0
}
]
]
},
"JsonToBinary": {
"main": [
[
{
"node": "SaveToFile",
"type": "main",
"index": 0
}
]
]
},
"checkifexists": {
"main": [
[
{
"node": "IF1",
"type": "main",
"index": 0
}
]
]
},
"getActualPrice": {
"main": [
[
{
"node": "IF4",
"type": "main",
"index": 0
}
]
]
},
"updateSavedItems": {
"main": [
[
{
"node": "JsonToBinary",
"type": "main",
"index": 0
}
]
]
},
"Move Binary Data1": {
"main": [
[
{
"node": "Write Binary File1",
"type": "main",
"index": 0
}
]
]
},
"NotifyBetterPrice": {
"main": [
[
{
"node": "IF",
"type": "main",
"index": 0
}
]
]
},
"updateSavedItems1": {
"main": [
[
{
"node": "updateSavedItems",
"type": "main",
"index": 0
}
]
]
},
"Write Binary File1": {
"main": [
[
{
"node": "IF",
"type": "main",
"index": 0
}
]
]
},
"NotifyIncorrectPrice": {
"main": [
[
{
"node": "checkifexists",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
smtp
About this workflow
Track Changes Of Product Prices. Uses htmlExtract, functionItem, httpRequest, writeBinaryFile. Scheduled trigger; 25 nodes.
Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →