Validate a Vat Number Submitted Through a Form

The workflow JSON

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{
  "name": "Validate a VAT number submitted through a form",
  "nodes": [
    {
      "parameters": {
        "formTitle": "Business Customer Sign-Up",
        "formDescription": "We check the VAT number against the EU VIES register before your account goes live.",
        "formFields": {
          "values": [
            {
              "fieldLabel": "Company name",
              "requiredField": true
            },
            {
              "fieldLabel": "VAT number",
              "placeholder": "DE123456789",
              "requiredField": true
            }
          ]
        },
        "options": {}
      },
      "id": "a1000000-0000-4000-8000-000000000001",
      "name": "Sign-up form",
      "type": "n8n-nodes-base.formTrigger",
      "typeVersion": 2,
      "position": [
        -460,
        0
      ]
    },
    {
      "parameters": {
        "operation": "checkFormat",
        "vatId": "={{ $json['VAT number'] }}"
      },
      "id": "a1000000-0000-4000-8000-000000000002",
      "name": "Check format (free)",
      "type": "n8n-nodes-vatnode.vatnode",
      "typeVersion": 1,
      "position": [
        -240,
        0
      ],
      "notes": "Offline pattern check. No API call, so it runs first and keeps typos out of the quota."
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "c1000000-0000-4000-8000-000000000001",
              "leftValue": "={{ $json.validFormat }}",
              "rightValue": true,
              "operator": {
                "type": "boolean",
                "operation": "true",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "id": "a1000000-0000-4000-8000-000000000003",
      "name": "Format looks right?",
      "type": "n8n-nodes-base.if",
      "typeVersion": 2,
      "position": [
        -20,
        0
      ]
    },
    {
      "parameters": {
        "vatId": "={{ $json.normalized }}"
      },
      "id": "a1000000-0000-4000-8000-000000000004",
      "name": "Validate against VIES",
      "type": "n8n-nodes-vatnode.vatnode",
      "typeVersion": 1,
      "position": [
        220,
        -100
      ],
      "credentials": {
        "vatnodeApi": {
          "name": "<your credential>"
        }
      },
      "notes": "Live VIES lookup. Spends one request from the monthly quota."
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "c1000000-0000-4000-8000-000000000002",
              "leftValue": "={{ $json.valid }}",
              "rightValue": true,
              "operator": {
                "type": "boolean",
                "operation": "true",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "id": "a1000000-0000-4000-8000-000000000005",
      "name": "Registered in VIES?",
      "type": "n8n-nodes-base.if",
      "typeVersion": 2,
      "position": [
        440,
        -100
      ]
    },
    {
      "parameters": {
        "operation": "completion",
        "completionTitle": "You're verified",
        "completionMessage": "={{ $json.companyName }} is registered for VAT in {{ $json.countryName }}. We've saved the check as audit evidence.",
        "options": {}
      },
      "id": "a1000000-0000-4000-8000-000000000006",
      "name": "Accepted",
      "type": "n8n-nodes-base.form",
      "typeVersion": 1,
      "position": [
        680,
        -200
      ]
    },
    {
      "parameters": {
        "operation": "completion",
        "completionTitle": "We couldn't confirm that VAT number",
        "completionMessage": "VIES has no active registration for this number. Check it and try again, or reply to our email and we'll sort it out.",
        "options": {}
      },
      "id": "a1000000-0000-4000-8000-000000000007",
      "name": "Not registered",
      "type": "n8n-nodes-base.form",
      "typeVersion": 1,
      "position": [
        680,
        0
      ]
    },
    {
      "parameters": {
        "operation": "completion",
        "completionTitle": "That doesn't look like a VAT number",
        "completionMessage": "={{ $json.error }}",
        "options": {}
      },
      "id": "a1000000-0000-4000-8000-000000000008",
      "name": "Wrong format",
      "type": "n8n-nodes-base.form",
      "typeVersion": 1,
      "position": [
        220,
        140
      ]
    },
    {
      "parameters": {
        "content": "## Two Checks, One Quota Hit\n\n**Check Format** runs offline and filters out typos without spending quota. Only the numbers that pass reach **Validate**, which does the live VIES lookup.\n\nAdd a **Vatnode API** credential to the Validate node before you run this. Get a key at [vatnode.dev/dashboard/api-keys](https://vatnode.dev/dashboard/api-keys) \u2014 the free plan needs no card.\n\nSet a Requester VAT under Account details in the vatnode dashboard, and every result carries a `consultationNumber` \u2014 the evidence a tax auditor asks for.",
        "height": 320,
        "width": 420
      },
      "id": "a1000000-0000-4000-8000-000000000009",
      "name": "Read me",
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        -460,
        -400
      ]
    }
  ],
  "connections": {
    "Sign-up form": {
      "main": [
        [
          {
            "node": "Check format (free)",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Check format (free)": {
      "main": [
        [
          {
            "node": "Format looks right?",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Format looks right?": {
      "main": [
        [
          {
            "node": "Validate against VIES",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "Wrong format",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Validate against VIES": {
      "main": [
        [
          {
            "node": "Registered in VIES?",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Registered in VIES?": {
      "main": [
        [
          {
            "node": "Accepted",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "Not registered",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "settings": {
    "executionOrder": "v1"
  },
  "meta": {
    "templateCredsSetupCompleted": false
  },
  "tags": []
}

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.

• vatnodeApi

About this workflow

Validate a VAT number submitted through a form. Uses formTrigger, n8n-nodes-vatnode, form. Event-driven trigger; 9 nodes.

Source: https://github.com/vatnode/vatnode-n8n/blob/main/templates/validate-vat-from-form.json — original creator credit. Request a take-down →

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