The workflow JSON
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{
"id": "1035",
"name": "Items length test",
"nodes": [
{
"parameters": {
"conditions": {
"boolean": [
{
"value1": true
}
]
}
},
"id": "94cd0ac4-1ab9-43ea-a68c-3f3849fb7bdb",
"name": "false",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
1580,
1520
]
},
{
"parameters": {},
"id": "b778d778-8dcf-4919-9ba4-f068d6d1bdcb",
"name": "When clicking \"Execute Workflow\"",
"type": "n8n-nodes-base.manualTrigger",
"typeVersion": 1,
"position": [
900,
1520
]
},
{
"parameters": {
"errorMessage": "length is wrong"
},
"id": "1b5c5dd0-23f8-463c-bb16-286d3fbb6787",
"name": "Stop and Error",
"type": "n8n-nodes-base.stopAndError",
"typeVersion": 1,
"position": [
2440,
1760
]
},
{
"parameters": {},
"id": "4567f986-4f13-41f7-bb6a-91fe3d250d9f",
"name": "length correct",
"type": "n8n-nodes-base.noOp",
"typeVersion": 1,
"position": [
2440,
1420
]
},
{
"parameters": {
"operation": "getAllPeople"
},
"id": "ab849617-9171-49f2-a047-a2cf38cf23c1",
"name": "Customer Datastore (n8n training)",
"type": "n8n-nodes-base.n8nTrainingCustomerDatastore",
"typeVersion": 1,
"position": [
1360,
1520
]
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $items().length }}",
"operation": "equal",
"value2": 5
}
]
}
},
"id": "d4cef066-3235-41cf-aece-f1bfcd589f38",
"name": "Check length $items - normal",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
1600,
1120
]
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $items().length }}",
"operation": "equal",
"value2": 5
}
]
}
},
"id": "a27bbf35-b6c0-4c2a-87cf-767c0447a37a",
"name": "Check length $items - execute once",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
1600,
1300
],
"executeOnce": true
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $input.all().length }}",
"operation": "equal",
"value2": 5
}
]
}
},
"id": "2e5d0d86-d8f0-4056-af78-c58c041716f6",
"name": "Check length $input - normal",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
1840,
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]
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $input.all().length }}",
"operation": "equal",
"value2": 5
}
]
}
},
"id": "2e9680cf-3dc4-4c20-9953-d1c3ba54e450",
"name": "Check length $input - once",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
1840,
2100
],
"executeOnce": true
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $items().length }}",
"operation": "equal",
"value2": 5
}
]
}
},
"id": "823ef4b3-ddbd-41e0-9eb4-4d8e4cdca5f6",
"name": "Check length $items - normal1",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
1840,
1540
]
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $items().length }}",
"operation": "equal",
"value2": 5
}
]
}
},
"id": "7b6e9dfb-8119-4de4-9931-2d91cd1c770d",
"name": "Check length $items - executeOnce",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
1840,
1720
],
"executeOnce": true
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $input.all().length }}",
"operation": "equal",
"value2": 5
}
]
}
},
"id": "7d4f6b70-e785-4a30-bbc1-49f99208a8a6",
"name": "Output items correct",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
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]
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $input.all().length }}",
"operation": "equal",
"value2": 1
}
]
}
},
"id": "5b231a48-cf95-4e3a-9a33-861e344a04a5",
"name": "Output items correct1",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
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]
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $input.all().length }}",
"operation": "equal",
"value2": 5
}
]
}
},
"id": "38007584-45f0-42d9-a65d-7ed1e3e8a2ee",
"name": "Output items correct2",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
2100,
1480
]
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $input.all().length }}",
"operation": "equal",
"value2": 1
}
]
}
},
"id": "9848f68a-df74-483f-bd50-13431aa34c91",
"name": "Output items correct3",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
2100,
1660
]
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $input.all().length }}",
"operation": "equal",
"value2": 1
}
]
}
},
"id": "dce2928e-5e48-402b-af48-fcb6814a1d5d",
"name": "Output items correct4",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
2100,
2080
]
},
{
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $input.all().length }}",
"operation": "equal",
"value2": 5
}
]
}
},
"id": "61598c23-19f7-47a0-a5a3-8fad9e52c2b7",
"name": "Output items correct5",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
2100,
1880
]
},
{
"parameters": {
"operation": "getAllPeople"
},
"id": "c20967a0-1456-470b-a3c2-d2bed2286c64",
"name": "Customer Datastore (n8n training)1",
"type": "n8n-nodes-base.n8nTrainingCustomerDatastore",
"typeVersion": 1,
"position": [
1500,
2460
]
},
{
"parameters": {},
"id": "93158bb5-e1ad-47f1-9411-c0b5d44f9dbe",
"name": "Data",
"type": "n8n-nodes-base.noOp",
"typeVersion": 1,
"position": [
1720,
2460
]
},
{
"parameters": {
"errorMessage": "Something is wrong"
},
"id": "76be52f7-e6e9-4ab3-ac39-fe97cd66aedc",
"name": "Stop and Error1",
"type": "n8n-nodes-base.stopAndError",
"typeVersion": 1,
"position": [
2660,
2520
]
},
{
"parameters": {},
"id": "bb3cf646-632b-4910-9fc4-f6cbacef0ebd",
"name": "All Good",
"type": "n8n-nodes-base.noOp",
"typeVersion": 1,
"position": [
2660,
2340
]
},
{
"parameters": {
"conditions": {
"string": [
{
"value1": "={{ $input.first().json.name }}",
"value2": "Jay Gatsby"
},
{
"value1": "={{ $input.last().json.name }}",
"value2": "Edmund Pevensie"
},
{
"value1": "={{ $input.all()[2].json.name }}",
"value2": "Max Sendak"
},
{
"value1": "={{ $('Data').pairedItem(0).json.name }}",
"value2": "Jay Gatsby"
},
{
"value1": "={{ $('Data').pairedItem(4).json.name }}",
"value2": "Edmund Pevensie"
},
{
"value1": "={{ $('Data').pairedItem().json.name }}",
"value2": "={{ $json.name }}"
},
{
"value1": "={{ $('Data').item.json.name }}",
"value2": "={{ $json.name }}"
},
{
"value1": "={{ $('Data').itemMatching(0).json.name }}",
"value2": "Jay Gatsby"
}
]
}
},
"id": "dabca800-dec3-4f57-97af-1e96f50d5700",
"name": "IF - normal",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
2260,
2320
]
},
{
"parameters": {
"conditions": {
"string": [
{
"value1": "={{ $input.first().json.name }}",
"value2": "Jay Gatsby"
},
{
"value1": "={{ $input.last().json.name }}",
"value2": "Edmund Pevensie"
},
{
"value1": "={{ $input.all()[2].json.name }}",
"value2": "Max Sendak"
},
{
"value1": "={{ $('Data').pairedItem(0).json.name }}",
"value2": "Jay Gatsby"
},
{
"value1": "={{ $('Data').pairedItem(4).json.name }}",
"value2": "Edmund Pevensie"
},
{
"value1": "={{ $('Data').pairedItem().json.name }}",
"value2": "={{ $json.name }}"
},
{
"value1": "={{ $('Data').item.json.name }}",
"value2": "={{ $json.name }}"
},
{
"value1": "={{ $('Data').itemMatching(0).json.name }}",
"value2": "Jay Gatsby"
}
]
}
},
"id": "50d2c9ef-f1a2-4f1b-9e24-d92e03ae99be",
"name": "IF - execute once",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
2260,
2520
],
"executeOnce": true
},
{
"parameters": {
"conditions": {
"boolean": [
{
"value2": true
}
]
}
},
"id": "e9a580a7-cad9-4dbf-8067-74acd31bc5c8",
"name": "IF",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
1980,
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]
},
{
"parameters": {
"conditions": {
"string": [
{
"value1": "={{ $input.first().json.name }}",
"value2": "Jay Gatsby"
},
{
"value1": "={{ $input.last().json.name }}",
"value2": "Edmund Pevensie"
},
{
"value1": "={{ $input.all()[2].json.name }}",
"value2": "Max Sendak"
},
{
"value1": "={{ $('Data').pairedItem(0).json.name }}",
"value2": "Jay Gatsby"
},
{
"value1": "={{ $('Data').pairedItem(4).json.name }}",
"value2": "Edmund Pevensie"
},
{
"value1": "={{ $('Data').pairedItem().json.name }}",
"value2": "={{ $json.name }}"
},
{
"value1": "={{ $('Data').item.json.name }}",
"value2": "={{ $json.name }}"
},
{
"value1": "={{ $('Data').itemMatching(0).json.name }}",
"value2": "Jay Gatsby"
}
]
}
},
"id": "c7bcb02d-2840-4d3d-a12e-8769d3bc84b3",
"name": "IF - normal1",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
2320,
2840
]
},
{
"parameters": {
"conditions": {
"string": [
{
"value1": "={{ $input.first().json.name }}",
"value2": "Jay Gatsby"
},
{
"value1": "={{ $input.last().json.name }}",
"value2": "Edmund Pevensie"
},
{
"value1": "={{ $input.all()[2].json.name }}",
"value2": "Max Sendak"
},
{
"value1": "={{ $('Data').pairedItem(0).json.name }}",
"value2": "Jay Gatsby"
},
{
"value1": "={{ $('Data').pairedItem(4).json.name }}",
"value2": "Edmund Pevensie"
},
{
"value1": "={{ $('Data').pairedItem().json.name }}",
"value2": "={{ $json.name }}"
},
{
"value1": "={{ $('Data').item.json.name }}",
"value2": "={{ $json.name }}"
},
{
"value1": "={{ $('Data').itemMatching(0).json.name }}",
"value2": "Jay Gatsby"
}
]
}
},
"id": "69230900-673a-49cd-826b-99f07d7e6596",
"name": "IF - execute once1",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
2320,
3040
],
"executeOnce": true
}
],
"connections": {
"false": {
"main": [
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
],
[
{
"node": "Check length $items - normal1",
"type": "main",
"index": 0
},
{
"node": "Check length $items - executeOnce",
"type": "main",
"index": 0
}
]
]
},
"When clicking \"Execute Workflow\"": {
"main": [
[
{
"node": "Customer Datastore (n8n training)1",
"type": "main",
"index": 0
},
{
"node": "Customer Datastore (n8n training)",
"type": "main",
"index": 0
}
]
]
},
"Customer Datastore (n8n training)": {
"main": [
[
{
"node": "Check length $items - normal",
"type": "main",
"index": 0
},
{
"node": "Check length $items - execute once",
"type": "main",
"index": 0
},
{
"node": "false",
"type": "main",
"index": 0
},
{
"node": "Check length $input - normal",
"type": "main",
"index": 0
},
{
"node": "Check length $input - once",
"type": "main",
"index": 0
}
]
]
},
"Check length $items - normal": {
"main": [
[
{
"node": "Output items correct",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Check length $items - execute once": {
"main": [
[
{
"node": "Output items correct1",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Check length $input - normal": {
"main": [
[
{
"node": "Output items correct5",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Check length $input - once": {
"main": [
[
{
"node": "Output items correct4",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Check length $items - normal1": {
"main": [
[
{
"node": "Output items correct2",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Check length $items - executeOnce": {
"main": [
[
{
"node": "Output items correct3",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Output items correct": {
"main": [
[
{
"node": "length correct",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Output items correct1": {
"main": [
[
{
"node": "length correct",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Output items correct2": {
"main": [
[
{
"node": "length correct",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Output items correct3": {
"main": [
[
{
"node": "length correct",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Output items correct4": {
"main": [
[
{
"node": "length correct",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Output items correct5": {
"main": [
[
{
"node": "length correct",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"Customer Datastore (n8n training)1": {
"main": [
[
{
"node": "Data",
"type": "main",
"index": 0
}
]
]
},
"Data": {
"main": [
[
{
"node": "IF - normal",
"type": "main",
"index": 0
},
{
"node": "IF - execute once",
"type": "main",
"index": 0
},
{
"node": "IF",
"type": "main",
"index": 0
}
]
]
},
"IF - normal": {
"main": [
[
{
"node": "All Good",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error1",
"type": "main",
"index": 0
}
]
]
},
"IF - execute once": {
"main": [
[
{
"node": "All Good",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error1",
"type": "main",
"index": 0
}
]
]
},
"IF": {
"main": [
[
{
"node": "Stop and Error1",
"type": "main",
"index": 0
}
],
[
{
"node": "IF - normal1",
"type": "main",
"index": 0
},
{
"node": "IF - execute once1",
"type": "main",
"index": 0
}
]
]
},
"IF - normal1": {
"main": [
[
{
"node": "All Good",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error1",
"type": "main",
"index": 0
}
]
]
},
"IF - execute once1": {
"main": [
[
{
"node": "All Good",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error1",
"type": "main",
"index": 0
}
]
]
}
},
"settings": {},
"triggerCount": 0,
"versionId": "d2f6e25c-3f7e-4824-8ab9-ed05bda4aaaf",
"owner": {
"type": "personal",
"personalEmail": "csaba@n8n.io"
}
}
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How this works
This workflow enables you to validate the length of input items in your automation processes, ensuring data integrity before proceeding with critical tasks. It's designed for developers and automation specialists handling variable datasets, such as customer records or API responses, who need reliable checks to prevent errors downstream. The key step involves using the stopAndError node to halt execution if item lengths don't match expectations, integrated seamlessly with the n8nTrainingCustomerDatastore for testing against sample data.
Use this workflow when building event-driven automations that require precise item counting, like validating form submissions or batch processes, to avoid processing incomplete data. Avoid it for simple linear tasks without variable inputs, as the 26-node chain might introduce unnecessary complexity. Common variations include adapting the if nodes for custom thresholds or integrating with external datastores for real-world customer data validation.
About this workflow
Items length test. Uses stopAndError, n8nTrainingCustomerDatastore. Event-driven trigger; 26 nodes.
Source: https://github.com/cstuncsik/n8n-env-test/blob/e63c9d292c1cf01fac4030bd5c388d1625448b9a/workflows/1035.json — original creator credit. Request a take-down →
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