Change Case

Transform a string between camelCase, PascalCase, Capital Case, snake_case, kebab-case, CONSTANT_CASE and others.

Installation

npm install change-case --save

Usage

import * as changeCase from "change-case";

changeCase.camelCase("TEST_VALUE"); //=> "testValue"

Included case functions:

All methods accept an options object as the second argument:

• delimiter?: string The character to use between words. Default depends on method, e.g. _ in snake case.
• locale?: string[] | string | false Lower/upper according to specified locale, defaults to host environment. Set to false to disable.
• split?: (value: string) => string[] A function to define how the input is split into words. Defaults to split.
• prefixCharacters?: string Retain at the beginning of the string. Defaults to "". Example: use "_" to keep the underscores in __typename.
• suffixCharacters?: string Retain at the end of the string. Defaults to "". Example: use "_" to keep the underscore in type_.

By default, pascalCase and snakeCase separate ambiguous characters with _. For example, V1.2 would become V1_2 instead of V12. If you prefer them merged you can set mergeAmbiguousCharacters to true.

Split

Change case exports a split utility which can be used to build other case functions. It accepts a string and returns each "word" as an array. For example:

split("fooBar")
  .map((x) => x.toLowerCase())
  .join("_"); //=> "foo_bar"

Change Case Keys

import * as changeKeys from "change-case/keys";

changeKeys.camelCase({ TEST_KEY: true }); //=> { testKey: true }

Change case keys wraps around the core methods to transform object keys to any case.

API

• input: any Any JavaScript value.
• depth: number Specify the depth to transfer for case transformation. Defaults to 1.
• options: object Same as base case library.

TypeScript and ESM

This package is a pure ESM package and ships with TypeScript definitions. It cannot be require'd or used with CommonJS module resolution in TypeScript.

License

MIT