Convert a string to snake case.
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> Convert a string to snake case.
``bash`
npm install @stdlib/string-snakecase
`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'
`
`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_😀'
`
- [@stdlib/string-snakecase-cli][@stdlib/string-snakecase-cli]: CLI package for use as a command-line utility.
- [@stdlib/string-camelcase][@stdlib/string/camelcase]: convert a string to camel case.
- [@stdlib/string-constantcase][@stdlib/string/constantcase]: convert a string to constant case.
- [@stdlib/string-kebabcase][@stdlib/string/kebabcase]: convert a string to kebab case.
- [@stdlib/string-pascalcase][@stdlib/string/pascalcase]: convert a string to Pascal case.
*
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].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
[@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
[chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg
[chat-url]: https://stdlib.zulipchat.com
[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
[@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