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# decamelize [](https://travis-ci.org/sindresorhus/decamelize)
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> Convert a camelized string into a lowercased one with a custom separator<br>
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> Example: `unicornRainbow` → `unicorn_rainbow`
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## Install
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```
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$ npm install --save decamelize
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```
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## Usage
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```js
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const decamelize = require('decamelize');
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decamelize('unicornRainbow');
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//=> 'unicorn_rainbow'
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decamelize('unicornRainbow', '-');
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//=> 'unicorn-rainbow'
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```
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## API
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### decamelize(input, [separator])
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#### input
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Type: `string`
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#### separator
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Type: `string`<br>
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Default: `_`
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## Related
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See [`camelcase`](https://github.com/sindresorhus/camelcase) for the inverse.
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## License
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MIT © [Sindre Sorhus](https://sindresorhus.com)
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