npm package: @stdlib/string-snakecase
Description: Convert a string to snake case.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
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  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
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# snakecase

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Convert a string to snake case.

<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/string-snakecase
```

</section>

<section class="usage">

## Usage

```javascript
var snakecase = require( '@stdlib/string-snakecase' );
```

#### snakecase( str )

Converts a string to snake case.

```javascript
var str = snakecase( 'Foo Bar' );
// returns 'foo_bar'

str = snakecase( 'I am a tiny little house' );
// returns 'i_am_a_tiny_little_house'

str = snakecase( 'Hello World!' );
// returns 'hello_world'
```

</section>

<!-- /.usage -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

```javascript
var snakecase = require( '@stdlib/string-snakecase' );

var str = 'foo bar baz';
var out = snakecase( str );
// returns 'foo_bar_baz'

str = 'foo_baz';
out = snakecase( str );
// returns 'foo_baz'

str = 'foo_bar_baz!';
out = snakecase( str );
// returns 'foo_bar_baz'

str = 'beep    boop!';
out = snakecase( str );
// returns 'beep_boop'

str = 'foo-baz';
out = snakecase( str );
// returns 'foo_baz'

str = 'Welcome! 😀';
out = snakecase( str );
// returns 'welcome_😀'
```

</section>

<!-- /.examples -->



<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

## See Also

-   <span class="package-name">[`@stdlib/string-snakecase-cli`][@stdlib/string-snakecase-cli]</span><span class="delimiter">: </span><span class="description">CLI package for use as a command-line utility.</span>
-   <span class="package-name">[`@stdlib/string-camelcase`][@stdlib/string/camelcase]</span><span class="delimiter">: </span><span class="description">convert a string to camel case.</span>
-   <span class="package-name">[`@stdlib/string-constantcase`][@stdlib/string/constantcase]</span><span class="delimiter">: </span><span class="description">convert a string to constant case.</span>
-   <span class="package-name">[`@stdlib/string-kebabcase`][@stdlib/string/kebabcase]</span><span class="delimiter">: </span><span class="description">convert a string to kebab case.</span>
-   <span class="package-name">[`@stdlib/string-pascalcase`][@stdlib/string/pascalcase]</span><span class="delimiter">: </span><span class="description">convert a string to Pascal case.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->


<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

<!-- /.stdlib -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="links">

[@stdlib/string-snakecase-cli]: https://www.npmjs.com/package/@stdlib/string-snakecase-cli

[npm-image]: http://img.shields.io/npm/v/@stdlib/string-snakecase.svg
[npm-url]: https://npmjs.org/package/@stdlib/string-snakecase

[test-image]: https://github.com/stdlib-js/string-snakecase/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/string-snakecase/actions/workflows/test.yml?query=branch:v0.2.3

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/string-snakecase/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/string-snakecase?branch=main

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[stdlib]: https://github.com/stdlib-js/stdlib

[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors

[cli-section]: https://github.com/stdlib-js/string-snakecase#cli
[cli-url]: https://github.com/stdlib-js/string-snakecase/tree/cli
[@stdlib/string-snakecase]: https://github.com/stdlib-js/string-snakecase/tree/main

[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

[deno-url]: https://github.com/stdlib-js/string-snakecase/tree/deno
[deno-readme]: https://github.com/stdlib-js/string-snakecase/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/string-snakecase/tree/umd
[umd-readme]: https://github.com/stdlib-js/string-snakecase/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/string-snakecase/tree/esm
[esm-readme]: https://github.com/stdlib-js/string-snakecase/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/string-snakecase/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/string-snakecase/main/LICENSE

[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams

[mdn-regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

<!-- <related-links> -->

[@stdlib/string/camelcase]: https://www.npmjs.com/package/@stdlib/string-camelcase

[@stdlib/string/constantcase]: https://www.npmjs.com/package/@stdlib/string-constantcase

[@stdlib/string/kebabcase]: https://www.npmjs.com/package/@stdlib/string-kebabcase

[@stdlib/string/pascalcase]: https://www.npmjs.com/package/@stdlib/string-pascalcase

<!-- </related-links> -->

</section>

<!-- /.links -->