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name-fixer is a fully typed implementation of Lingua::EN::NameCase, a library for converting strings to be properly cased. This is good for converting denormalized data to human friendly data.

NOTE: This is a fork from the discontinued library @foundernest/namecase. I was the author but I don't work in that company anymore. I still wanted to continue improving the library.


Forenames and surnames are often stored either entirely in UPPERCASE or lowercase. This library allows you to convert names into the correct case where possible. Although forenames and surnames are typically stored separately if they do appear in a single string, whitespace-separated, name-fixer deals correctly with them.

Currently name-fixer correctly name cases names which include any of the following:

Mc, Mac, al, el, ap, bat, ben, bin, binti, binte, da, de, das, dos, delle, della, di, du, del, der, den, ten, ter, la, le, lo, van and von.

It correctly deals with names which contain apostrophes and hyphens too.


Via npm

npm install name-fixer

Via yarn

yarn add name-fixer

Via pnpm

pnpm add name-fixer


Basic usage

import { nameFixer } from 'name-fixer';

nameFixer('KEITH');               // => Keith
nameFixer('LEIGH-WILLIAMS');      // => Leigh-Williams
nameFixer('MCCARTHY');            // => McCarthy
nameFixer("O'CALLAGHAN");         // => O'Callaghan
nameFixer('ST. JOHN');            // => St. John
nameFixer('VON STREIT');          // => von Streit
nameFixer('AP LLWYD DAFYDD');     // => ap Llwyd Dafydd
nameFixer('HENRY VIII');          // => Henry VIII
nameFixer('VAN DYKE');            // => van Dyke

Advance usage

You can override the default options by calling the nameFixer function with the EnvironmentOptions optional parameter:

import { nameFixer } from 'name-fixer';

nameFixer('macmurdo');                        // => MacMurdo
nameFixer('macmurdo', { irish: false });      // => Macmurdo

You can also set the options of all the subsequent calls:

import { nameFixer, setOptions } from 'name-fixer';

nameFixer('macmurdo');               // => MacMurdo
setOptions({ irish: false });
nameFixer('macmurdo');               // => Macmurdo

Or you can even create a new Environment object with custom options:

import Environment from 'name-fixer';

const ncEnv = new Environment({
  lazy: false
  roman: false

ncEnv.nameFixer('Na li');     // => Na Li


  • lazy – Default: true. Do not do anything if string is already mixed case and lazy option is true.
  • irish – Default: true. Correct "Mac" exceptions.
  • spanish – Default: true. Correct spanish conjunctions y, e or i.
  • roman – Default: true. Correct roman numbers.
  • hebrew – Default: true. Correct ben, bat.
  • postNominal – Default: true. Correct post-nominal. e.g. PhD.

Exclude Post-Nominals

import { excludePostNominals, nameFixer } from 'name-fixer';

nameFixer('ČERNÝ MOST');         // Černý MOst
nameFixer('ČERNÝ MOST');         // Černý Most


Please see CHANGELOG for more information about what has changed recently.


pnpm test


Please see the Contributing guide and Code of Conduct for details.


This library is a port of the PHP package by Yuri Tkachenko which is also a port of the Perl library and owes most of its functionality to the Perl version by Mark Summerfield. Any bugs in the Typescript port are my fault.


Original PERL Lingua::EN::NameCase Version:

  • Copyright © Mark Summerfield 1998-2014. All Rights Reserved.
  • Copyright © Barbie 2014-2020. All Rights Reserved.

Ruby Version:

  • Copyright © Aaron Patterson 2006. All Rights Reserved.

PHP Version:

  • Copyright © Yuri Tkachenko 2016-2020. All Rights Reserved.

Typescript version:

NOTE: This is a fork from foundernest/namecase since I don't work there anymore but I still wanted to continue improving the library.


The MIT License (MIT). Please see License File for more information.

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