Swedish bank account validator

Validation logic for swedish bank accounts according to public bank account format documents

The validation is built around bank information from centralized bank details information from bankgirot.se. The document used as validation logic in this package can be found here: Bank account validation document.

To run and install this package

$ npm install swedish-bank-account-validator

import { accountAndClearingCheck } from 'swedish-bank-account-validator';
const validationObject = accountAndClearingCheck(1234, 123456789);

Functions

• accountAndClearingCheck takes clearing and account number as input and returns an object with validation information.

{
	name: string | undefined
	hasWarning: boolean
	warningType: string
	clearing: {
		number: string
		valid: boolean
		errorType: string
	},
	account: {
		number: string
		valid: boolean
		errorType: string
	},
}

• clearingNumberCheck takes clearing number as input and returns an object with validation information.

{
	name: string
	number: string
	valid: boolean
	errorType: string
	hasWarning: boolean
	warningType: string
}

• accountNumberCheck takes account number as input and returns an object with validation information.

{
	number: string
	valid: boolean
	errorType: string
}

• getBankDataFromClearingNumber takes clearing number as input and returns an object with bank information user for validation logic.

{
	name: string
	number: string
	valid: boolean
	errorType: string
	hasWarning: boolean
	warningType: string
}

Returned values

there are 2 different kind of validation failures present in the return objects.

Error

The strict validation is if there is an error in the format of either account or clearing number. These are strict and can be considered to determine that the input numbers are not valid. The ErrorType is refering to what kind of formatting error this is.

Warning

The warning is true if the bank account did not match a format provided by the algorithms. A warningType is also provided stating if this is connected to the clearing number, or of it is connected to the whole account (clearing and account number) It is returned as a warning as it might not be 100% accurate.

The only way for the bank account validation to be 100% correct is to use an open banking API. This static bank account check is however very accurate, and most failures in this validation functionalty would be giving a false positive, most frequently occuring with Swedbank since they have a different format in relation to other banks as stated in the validation document.

Other information

Terms of usage (MIT) - Lisence

Basicly feel free to use, fork etc. But The author takes no responsibility of the code as stated in the license.