decamelize-keys

This project was forked from camelcase-keys and converted to do the opposite. This project will keep updated with camelcase-keys.

Convert object keys to lowercased one using decamelize.

Install

$ npm install @puuuudding/decamelize-keys

Usage

const decamelizeKeys = require('decamelize-keys');

// Convert an object
decamelizeKeys({fooBar: true});
//=> {'foo_bar': true}

// Convert an array of objects
decamelizeKeys([{fooBar: true}, {barFoo: false}]);
//=> [{'foo_bar': true}, {'bar_foo': false}]

decamelizeKeys({fooBar: true, nested: {unicornRainbow: true}}, {deep: true});
//=> {'foo_bar': true, nested: {'unicorn_rainbow': true}}

// Use custom separator
decamelizeKeys({fooBar: true, nested: {unicornRainbow: true}}, {deep: true, separator: '-'});
//=> {'foo-bar': true, nested: {'unicorn-rainbow': true}}

API

decamelizeKeys(input, options?)

input

Type: object | object[]

An object or array of objects to decamelize.

options

Type: object

exclude

Type: Array<string | RegExp>
Default: []

Exclude keys from being camel-cased.

stopPaths

Type: string[]
Default: []

Exclude children at the given object paths in dot-notation from being decamelize. For example, with an object like {a: {b: '🦄'}}, the object path to reach the unicorn is 'a.b'.

decamelizeKeys({
	aB: 1,
	aC: {
		cD: 1,
		cE: {
			eF: 1
		}
	}
}, {
	deep: true,
	stopPaths: [
		'aC.cE'
	]
})
/*
{
	a_b: 1,
	a_c: {
		c_d: 1,
		c_e: {
			eF: 1
		}
	}
}
*/

deep

Type: boolean
Default: false

Recurse nested objects and objects in arrays.

separator

Type: string
Default: '_'

Character or string inserted to separate words in key.

const decamelize = require('decamelize');

decamelize('unicornRainbow');
//=> 'unicorn_rainbow'

decamelize('unicornRainbow', {separator: '-'});
//=> 'unicorn-rainbow'

preserveConsecutiveUppercase

Type: boolean
Default: false

Preserve sequences of uppercase characters.

const decamelize = require('decamelize');

decamelize('testGUILabel');
//=> 'test_gui_label'

decamelize('testGUILabel', {preserveConsecutiveUppercase: true});
//=> 'test_GUI_label'

Related

See camelcase-keys for the inverse.