The fastest Spanish DNI (NIE / NIF) validation out there — And lighter: 660 bytes.

Installation

// npm
npm i better-dni

// yarn
yarn add better-dni

Usage

isValid / isNIF / isNIE / ctrlChar

import { isValid, isNIF, isNIE, ctrlChar } from "better-dni";

// validates any type of DNI (NIE or NIF)
isValid("Z7662566Y"); //=> true

// checks if it is a valid NIF
isNIF("06672804K"); //=> true

// checks if it is a valid NIE
isNIE("X1302311M"); //=> true

// returns the control letter in upper case
ctrlChar("X1302311M"); //=> 'M'
ctrlChar("X1302311"); //=> 'M'

Generators

NIF

import { randomNIF, randomNIFWith } from "better-dni";

randomNIF(); //=> '31719111H'

// returns a valid random NIF given the control letter
randomNIFWith("C"); // => '95652190C'

// a seed (Number) can be provided and it will always return the same result
randomNIFWith("G", 1); //=> '95652174G'
randomNIFWith("G", 1); //=> '95652174G'

NIE

import { randomNIE, randomNIEWith } from "better-dni";

randomNIE(); //=> 'X1120409X'

// returns a valid random NIE given the first and control letter
randomNIEWith("Y", "C"); //=> 'Y2098020C'
randomNIEWith("Z", "G"); //=> 'Z5670557G'

// a seed (Number) can be provided and it will always return the same result
randomNIEWith("X", "E", 1); //=> 'X2080280E'
randomNIEWith("X", "E", 1); //=> 'X2080280E'

Normalize

// Returns a "clean" dni string removing spaces, dashes, etc.
normalize(" x-9464186_p   "); // => "X9464186P"

Benchmark

better-dni does a similar job as other libraries like dni-js, dni-js-validator, and @willowi/validate-nif but better-dni is built with optimization and speed in mind. Take a look at these benchmark results:

yarn run benchmark

isValid

| lib | method | time | diff | | --------------------- | ------------ | -------- | ------------- | | better-dni | #isValid | 896 ms | | | dni-js-validator | #isValid | 2550 ms | x2.85 slower | | dni-js | #isValid | 2630 ms | x2.94 slower | | @willowi/validate-nif | #validateNif | 11000 ms | x12.27 slower |

ctrlChar / getLetter

| lib | method | time | diff | | --------------------- | ---------- | ------- | ------------ | | better-dni | #ctrlChar | 859 ms | | | dni-js | #getLetter | 2190 ms | x2.55 slower | | dni-js-validator | no method | - | | | @willowi/validate-nif | no method | - | |

Benchmark on a MacBook Pro (16-inch, 2019) - 2,6 GHz 6-Core Intel Core i7 - 16 GB 2667 MHz DDR4 / Node v14.15.1

Demo

https://better-dni.singuerinc.com/

Related

• spain-phone - Spanish phone number validation

Reference

http://www.interior.gob.es/web/servicios-al-ciudadano/dni/calculo-del-digito-de-control-del-nif-nie