IBAN Validator and Structure Breakdown

{
  "type": "object",
  "required": [
    "iban"
  ],
  "properties": {
    "iban": {
      "type": "string",
      "description": "The IBAN to check, written without spaces, starting with its two-letter country code."
    }
  },
  "additionalProperties": false
}

{
  "type": "object",
  "properties": {
    "bban": {
      "type": "string",
      "description": "The Basic Bank Account Number: everything after the check digits."
    },
    "valid": {
      "type": "boolean",
      "description": "Whether the IBAN passed the check."
    },
    "bank_code": {
      "type": "string",
      "description": "The bank identifier read from the BBAN."
    },
    "branch_code": {
      "type": [
        "string",
        "null"
      ],
      "description": "The branch identifier read from the BBAN (a sort code for a UK IBAN); null when the country's format carries none."
    },
    "check_digits": {
      "type": "string",
      "description": "The two check digits after the country code."
    },
    "country_code": {
      "type": "string",
      "description": "The two-letter country code the IBAN starts with."
    },
    "expected_length": {
      "type": "number",
      "description": "The total IBAN length, in characters, that the country's format requires."
    }
  },
  "description": "The IBAN check and its parts."
}