Personnummer.js NPM

personnummer.js

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JavaScript script (written in TypeScript) to validate and parse Swedish personal identity numbers. Fixes problems other packages fail to fix, e.g.: leap years, co-ordination numbers (samordningsnummer), parsing, and strict validation; while being backed by tests. All in one small package without dependencies. Works for Swedish personal numbers of all formats, see examples below.

Also works with Swedish organisations numbers.

Installing

Install the module with npm: npm install personnummer.js

Basic usage

var personnummer = require("personnummer.js");

// valid personal number formats: yymmdd-nnnn yyyymmdd-nnnn yymmddnnnn yyyymmddnnnn yymmdd+nnnn yyyymmdd+nnnn
// valid personal number formats ex.: 040506-7356, 9912188324, 19780329-2833, 201005047640, 180604+0448

personnummer.validate("970214-9890");
// true

personnummer.validate("0708089396");
// true

personnummer.validate("123456-7890");
// false

personnummer.normalise("870724-1082");
// '198707241082'

personnummer.parse("19710904-5307");
/*
{
  valid: true,
  type: 'PERSONNUMMER',
  input: '19710904-5307',
  normalised: '197109045307',
  date: 1971-09-04T00:00:00.000Z,
  age: 47,
  gender: 'FEMALE',
  birthplace: 'Göteborgs och bohus län'
}
*/

personnummer.parse("0411643844", { normaliseFormat: "YYMMDD-NNNN" });
/*
{
  valid: true,
  type: 'SAMORDNINGSNUMMER',
  input: '0411643844',
  normalised: '041164-3844',
  date: 2004-11-04T00:00:00.000Z,
  age: 17,
  gender: 'FEMALE',
  birthplace: undefined
}
*/

personnummer.parseCIN("556007-3495");
/*
{
  valid: true,
  type: 'Aktiebolag',
  input: '556007-3495',
  normalised: '165560073495'
}
*/

Functions

Personal Number

Description

Function	Description
validate(str , options)	Checks if the input personal number is a valid Swedish personal number.
normalise(str , options)	Normalises the input. Default format: `yyyymmddnnnn`. E.g. `960417-5050` -> `199604175050`. See `options.normaliseFormat`
parse(str , options)	Parses the personal number and returns an object. See basic usage.

Returns

Function	Returns
validate(str , options)	boolean. true if valid, false if not.
normalise(str ,options)	string, can be empty if personal number is not valid.
parse(str , options)	Returns an object with: `valid` (boolean), `input` (string), `normalised` (string), `date` (Date object), `age` (number), `gender` (string: male or female), `birthplace` (string or undefined if personal number > 1990). If the personal number is invalid: resturns `valid:false` and a `reason:'example reason'` and `input`. See basic usage or examples.

Options

Option	Input	Description
strict	`boolean (default true)`	Sets strict validation, i.e. personal number can not be from the future and separator must match age (`-` for age < 100 `+` for ages >= 100)
forgiving	`boolean (default true)`	If the user possibly incorrectly used a '+' separator instead of a '-' separator forgive them and correct their mistake.
normaliseFormat	`string (default YYYYMMDDNNNN)`	Normalise the personal number to that format. Allowed format tokens: `YYYY`, `YY`, `MM`, `DD`, `-` or `+` (separator), `NNNN`. E.g. `YYMMDD-NNNN`

Examples

var personnummer = require("personnummer.js");

personnummer.parse("19980417+6320", { normaliseFormat: "YYYYMMDD-NNNN" });
/*
{
  valid: true,
  type: 'PERSONNUMMER',
  input: '19980417+6320',
  normalised: '19980417-6320',
  date: 1998-04-17T00:00:00.000Z,
  age: 24,
  gender: 'FEMALE',
  birthplace: undefined
}
*/

personnummer.parse("19980417+6320", { normaliseFormat: "YYYYMMDD-NNNN", forgiving: false });
/*
{
  valid: false,
  reason: 'AGE_SEPARATOR_CONTRADICTION',
  input: '19980417+6320'
}
*/

Invalid reasons

Possible reasons the parse function could return if personal number is invalid.

Return	Reason	ex. input
INPUT_TYPE	Input type is not string or number.	[]
FORMAT	The input personal number is of invalid format.	+46-498-xx-34-xx
INCORRECT_DATE	The input date is incorrect.	010143-0987
CHECKSUM	The personal number is incorrect, checksum of personal number is incorrect.	050607-4381

if strict option is enabled:

Return	Reason	ex. input
AGE_SEPARATOR_CONTRADICTION	If the age >= 100 but the separator is '-' or vice versa.	19181120-1829
BACK_TO_THE_FUTURE	Personal numbers date is from the future.	20300330-3975
AGE_IS_TOO_OLD	The age of the personal number is too old.	18971224+5472

Corporate Identity Number (CIN)

Note that a CIN in Sweden can be a personal number. This package takes that into account, ex. parsing a valid personal number to this function will return type:'Enskild firma' (along with other properties).