uncase

Wrapper of change-case to create case converter, validator and etc.

Install

npm install uncase

yarn add uncase

pnpm add uncase

Usage

case converter

import { getCaseConverter } from 'uncase'

const result = getCaseConverter('camelCase')('hello-world')

console.log(result)
// => { input: 'hello-world', changed: true, output: 'helloWorld' }

case validator

import { isCamelCase, isPascalCase } from 'uncase/is'

console.log(isCamelCase('hello-world'))
// => false

console.log(isPascalCase('HelloWorld'))
// => true

API

Case converter

getCaseConverter

• Type: (caseType: CaseType, options: Options = {}) => CaseConverter

Get a converter by caseType and convert the given input.

Interface

/**
 * Case converter
 */
export type CaseConverter = (input: string) => CaseConvertResult

/**
 * Case convert result
 */
export type CaseConvertResult = {
  /**
   * whether output has changed from input
   */
  changed: boolean

  /**
   * input value
   */
  input: string

  /**
   * converted value
   */
  output: string
}

/**
 * All case converter names in raw and `camelCase`
 */
export type CaseType =
  | 'camelCase'
  | 'capitalCase'
  | 'Capital Case'
  | 'CONSTANT_CASE'
  | 'constantCase'
  | 'dot.case'
  | 'dotCase'
  | 'kebab-case'
  | 'kebabCase'
  | 'noCase'
  | 'no case'
  | 'Pascal_Snake_Case'
  | 'pascalCase'
  | 'PascalCase'
  | 'pascalSnakeCase'
  | 'path/case'
  | 'pathCase'
  | 'sentenceCase'
  | 'Sentence case'
  | 'snake_case'
  | 'snakeCase'
  | 'Train-Case'
  | 'trainCase'

Case validator

• isCamelCase
• isCapitalCase
• isConstantCase
• isDotCase
• isKebabCase
• isNoCase
• isPascalCase
• isPascalSnakeCase
• isPathCase
• isSentenceCase
• isSnakeCase
• isTrainCase

Type

export type CaseValidator = (input: string) => boolean

Why this?

Dynamic case convert. Useful to create ESLint case convention rules.

Credits

• change-case

License

MIT License © 2025-PRESENT ntnyq