IBAN Validation API

curl "https://bankcheck.dev/api/v1/validate?q=GB29NWBK60161331926819"

{
  "apiVersion": "1",
  "processingTimeMs": 1,
  "result": {
    "valid": true,
    "format": "iban",
    "normalized": "GB29NWBK60161331926819",
    "errors": [],
    "breakdown": {
      "formatName": "IBAN",
      "parts": [
        { "label": "Country", "value": "GB", "start": 0, "end": 2 },
        { "label": "Check Digits", "value": "29", "start": 2, "end": 4 },
        { "label": "Bank Code", "value": "NWBK", "start": 4, "end": 8 },
        { "label": "Sort Code", "value": "601613", "start": 8, "end": 14 },
        { "label": "Account Number", "value": "31926819", "start": 14, "end": 22 }
      ]
    },
    "bankInfo": {
      "bankName": "NatWest",
      "bic": "NWBKGB2L",
      "country": "United Kingdom",
      "countryCode": "GB",
      "city": "London"
    }
  }
}

curl "https://bankcheck.dev/api/v1/validate?q=DE00370400440532013000"

{
  "apiVersion": "1",
  "processingTimeMs": 0,
  "result": {
    "valid": false,
    "format": "iban",
    "normalized": "DE00370400440532013000",
    "errors": [
      {
        "code": "CHECKSUM_FAILED",
        "message": "IBAN check digits are incorrect",
        "suggestion": "Double-check digits 3-4 of the IBAN"
      }
    ],
    "breakdown": null,
    "bankInfo": null
  }
}