dln

dln

Generates and validates driving license numbers (DLNs). Presently, only licenses issued by the UK DVLA are supported. Please open an issue if you'd like to see support added for another type of license - I'd be keen to work with you to enable this.

import DLN from 'dln';

const user1 = {
	familyName: 'Morgan',
	personalName: 'Sarah Meredyth',
	birthDate: '1964-07-05',
	sex: 'F',
};

const user2 = {
	familyName: 'Gardner',
	personalName: 'Charles',
	birthDate: '1969-05-10',
	sex: 'M',
};

const finalChars = '9IJ';
const completeDLN = 'MORGA657054SM9IJ';

console.log(DLN.generate(user1)); // => MORGA657054SM
console.log(DLN.generate(user1, finalChars)); // => MORGA657054SM9IJ
console.log(DLN.generate(user2)); // => GARDN605109C9
console.log(DLN.validate(completeDLN)); // => true
console.log(DLN.validate(completeDLN, user1)); // => true
console.log(DLN.validate(completeDLN, user2)); // => false

Installation

$ npm install dln

API

DLN.generate(userDetails[, finalCharacters])

Generates a DLN based on the given user details, optionally adding the final characters to the end (as these characters cannot be generated accurately).

If the final characters are not provided, the output will not be a complete DLN and will fail validation in the DLN.validate function.

Returns a string either 13 or 16 characters in length, depending on whether the final characters are provided.

Throws if the user details or final characters are invalid.

DLN.validate(dln[, userDetails])

Verifies that a complete DLN is valid, optionally checking that the first 13 characters of the DLN are correct for the given user details.

Returns a boolean indicating whether the DLN is valid.

Throws if the user details are invalid.

Notes

The user details information, when provided, must be exactly as specified below:

{
	familyName: 'von Neumann', // required, string - can contain spaces
	personalName: 'John', // optional, string - first names, including middle names
	birthDate: '1969-05-10', // required, string - YYYY-MM-DD date
	sex: 'M', // required, string, (M|F) - whatever the person has stated to the DVLA
}

DLNs follow a relatively strict format, and are exactly 16 characters in length. Only the first 13 characters of a DLN can be accurately generated - the remaining 3 characters cannot and must be provided separately.

The final characters also follow a strict format, and are exactly 3 characters in length. These are typically appended to the generated part of the DLN in order to form a complete & valid DLN.

Support

Please open an issue on this repository.

Authors

• James Billingham [e-mail]

License

MIT licensed - see LICENSE file