Case anything 🐫

npm i case-anything

14 case changing functions: camelCase, kebab-case, PascalCase and more...
A simple integration with nano package size. (SMALL footprint!)

Motivation

I created this package because most other packages that do simple case changing are so big...

Some features I focused on:

small footprint (it's 12+ times smaller than the next popular case changing package!!)

tree-shakable — only import what you need

awesome JSDocs popup documentation on hover

fully typed with TypeScript

complete coverage with unit testing

0 dependencies

Case anything is used in...

Famous Mac app Popclip 💊

State Management Library Magnetar 🌟

Vue Form Generator Blitzar ⚡️

Lottie-player ∫

OpenAPI CLI Portman 👨🏽‍🚀

and 100s more...

Usage

case-anything supports tree-shaking and is side-effect free!

// just import the functions you need like so:
import { camelCase, kebabCase } from 'case-anything'

case-anything has different behaviour if the string you pass has spaces or not.

Without spaces it will split and format on every "part" it can detect
With spaces it will split and format on every "word" based on those spaces

Strings without spaces

Name	Input example	Output example
🐪 camelCase	`camelCase('$catDog')`	`catDog`
🐫 PascalCase UpperCamelCase	`pascalCase('$catDog')` `upperCamelCase('$catDog')`	`CatDog`
🥙 kebab-case	`kebabCase('$catDog')`	`cat-dog`
🐍 snake_case	`snakeCase('$catDog')`	`cat_dog`
📣 CONSTANT_CASE	`constantCase('$catDog')`	`CAT_DOG`
🚂 Train-Case	`trainCase('$catDog')`	`Cat-Dog`
🕊 Ada_Case	`adaCase('$catDog')`	`Cat_Dog`
👔 COBOL-CASE	`cobolCase('$catDog')`	`CAT-DOG`
📍 Dot.notation	`dotNotation('$catDog')`	`cat.Dog`
📂 Path/case	`pathCase('$catDog')`	`$cat/Dog`
🛰 Space case	`spaceCase('$catDog')`	`$cat Dog`
🏛 Capital Case	`capitalCase('$catDog')`	`$Cat Dog`
🔡 lower case	`lowerCase('$catDog')`	`$cat dog`
🔠 UPPER CASE	`upperCase('$catDog')`	`$CAT DOG`

Special Characters

You can see that most functions by default remove special characters, and some functions keep special characters.

functions that remove special characters*	functions that keep special characters*
camelCase pascalCase kebabCase snakeCase constantCase trainCase adaCase cobolCase dotNotation	pathCase spaceCase capitalCase lowerCase upperCase

*You can control wether or not to keep or remove special characters like so:

// default:
camelCase('$catDog') === 'catDog'
// force keeping special characters:
camelCase('$catDog', { keepSpecialCharacters: true }) === '$catDog'

// default:
pathCase('$catDog') === '$cat/Dog'
// force removing special characters:
pathCase('$catDog', { keepSpecialCharacters: false }) === 'cat/Dog'

Case Changing

These cases do not change the casing of the words:

dotNotation
pathCase
spaceCase

// default:
dotNotation('$catDog') === 'cat.Dog'
// force lower case:
dotNotation('$catDog').toLowerCase() === 'cat.dog'

Strings with spaces

As soon as there is a space in the target string, it will regard the input as a sentence and only split each part at the spaces.

Name	Input example	Output example
🐪 camelCase	`camelCase("I'm O.K.!")`	`imOk`
🐫 PascalCase UpperCamelCase	`pascalCase("I'm O.K.!")` `upperCamelCase("I'm O.K.!")`	`ImOk`
🥙 kebab-case	`kebabCase("I'm O.K.!")`	`im-ok`
🐍 snake_case	`snakeCase("I'm O.K.!")`	`im_ok`
📣 CONSTANT_CASE	`constantCase("I'm O.K.!")`	`IM_OK`
🚂 Train-Case	`trainCase("I'm O.K.!")`	`Im-Ok`
🕊 Ada_Case	`adaCase("I'm O.K.!")`	`Im_Ok`
👔 COBOL-CASE	`cobolCase("I'm O.K.!")`	`IM-OK`
📍 Dot.notation	`dotNotation("I'm O.K.!")`	`Im.OK`
📂 Path/case	`pathCase("I'm O.K.!")`	`I'm/O.K.!`
🛰 Space case	`spaceCase("I'm O.K.!")`	`I'm O.K.!`
🏛 Capital Case	`capitalCase("I'm O.K.!")`	`I'm O.k.!`
🔡 lower case	`lowerCase("I'm O.K.!")`	`i'm o.k.!`
🔠 UPPER CASE	`upperCase("I'm O.K.!")`	`I'M O.K.!`

Also note, that multiple sequential spaces are treated as one space.

Keep only certain special characters

Instead of removing all special characters, you can opt to keep some special characters.

In the example below we see:

input: $cat-dog
desired output: $CatDog

pascalCase('$cat-dog', { keepSpecialCharacters: false })
// CatDog   → not what we want

pascalCase('$cat-dog', { keepSpecialCharacters: true })
// $Cat-Dog → not what we want

pascalCase('$cat-dog', { keep: ['$'] })
// $CatDog  → desired output

Convert special characters into alphabet

I have extended regular alphabet with the most common Latin-1 Supplement special characters.

The coolest thing about this library is that it will "convert" special characters into regular alphabet for the cases used as variable names! 😎

// CONVERTS special characters:
camelCase('Çâfé Ågård')    === 'cafeAgard'
pascalCase('Çâfé Ågård')   === 'CafeAgard'
kebabCase('Çâfé Ågård')    === 'cafe-agard'
snakeCase('Çâfé Ågård')    === 'cafe_agard'
constantCase('Çâfé Ågård') === 'CAFE_AGARD'
trainCase('Çâfé Ågård')    === 'Cafe-Agard'
adaCase('Çâfé Ågård')      === 'Cafe_Agard'
cobolCase('Çâfé Ågård')    === 'CAFE-AGARD'
dotNotation('Çâfé Ågård')  === 'Cafe.Agard'

// DOES NOT convert special characters:
spaceCase('Çâfé Ågård')    === 'Çâfé Ågård'
pathCase('Çâfé Ågård')     === 'Çâfé/Ågård'
lowerCase('Çâfé Ågård')    === 'çâfé ågård'
upperCase('Çâfé Ågård')    === 'ÇÂFÉ ÅGÅRD'
capitalCase('Çâfé Ågård')  === 'Çâfé Ågård'

JSDocs

I have made sure there is great documentation available on hover!

jsdocs preview

Keyboard shortcuts

With Better Touch Tool you can set up keyboard shortcuts to convert selected text with JavaScript. This repo provides an easy to install preset that has shortcuts for pascal, kebab and camel case! (thanks to @AndrewKoch) It even supports multi-cursors in VSCode!

Here is an example triggering keyboard shortcuts to convert the selected text to PascalCase; kebab-case; camelCase:

keyboard shortcuts example

You can download the BTT preset from the source code: case-anything.bttpreset.

Package size

We'll compare this package with blakeembrey/change-case, a very famous package on npm.

	case-anything	change-case
camelCase	1.1K (572)	27.2K (6K)
pascalCase	1.1K (561)	27.4K (6.1K)
kebabCase	1.1K (541)	26.8K (5.9K)
snakeCase	1.1K (540)	26.8K (5.9K)
constantCase	1.1K (540)	27.2K (6K)
pathCase	1K (530)	26.8K (5.9K)

Source code

What keeps my package small, is that literally just uses a regex to separate "words".

// the source code is similar to:
export function splitOnSpecialChars(string: string): any[] {
  return string.match(/^[a-z]+|[A-Z][a-z]+|[a-z]+|[0-9]+|[A-Z]+(?![a-z])/g)
}