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	# decamelize [![Build Status](https://travis-ci.org/sindresorhus/decamelize.svg?branch=master)](https://travis-ci.org/sindresorhus/decamelize)

	> Convert a camelized string into a lowercased one with a custom separator<br>
	> Example: `unicornRainbow` → `unicorn_rainbow`


	## Install

	```
	$ npm install --save decamelize
	```


	## Usage

	```js
	const decamelize = require('decamelize');

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

	decamelize('unicornRainbow', '-');
	//=> 'unicorn-rainbow'
	```


	## API

	### decamelize(input, [separator])

	#### input

	Type: `string`

	#### separator

	Type: `string`<br>
	Default: `_`


	## Related

	See [`camelcase`](https://github.com/sindresorhus/camelcase) for the inverse.


	## License

	MIT © [Sindre Sorhus](https://sindresorhus.com)