npm package: @stdlib/string-percent-encode
Description: Percent-encode a UTF-16 encoded string according to RFC 3986.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
  </summary>
  <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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</details>

# percentEncode

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

> [Percent-encode][percent-encoding] a [UTF-16][utf-16] encoded string according to [RFC 3986][rfc-3986-percent-encoding].

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/string-percent-encode
```

</section>

<section class="usage">

## Usage

```javascript
var percentEncode = require( '@stdlib/string-percent-encode' );
```

#### percentEncode( str )

[Percent-encodes][percent-encoding] a [UTF-16][utf-16] encoded string according to [RFC 3986][rfc-3986-percent-encoding].

```javascript
var out = percentEncode( '☃' );
// returns '%E2%98%83'
```

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   The function [percent-encodes][percent-encoding] an **entire** string. Hence, if provided a URI, the function [percent-encodes][percent-encoding] the entire URI.

    ```javascript
    var out = percentEncode( 'https://en.wikipedia.org/wiki/Mode_(statistics)' );
    // returns 'https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FMode_%28statistics%29'
    ```

    To [percent-encode][percent-encoding] a URI, split the URI into separate components, [percent-encode][percent-encoding] relevant components, and then reassemble.

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var percentEncode = require( '@stdlib/string-percent-encode' );

var values = [
    'Ladies + Gentlemen',
    'An encoded string!',
    'Dogs, Cats & Mice',
    '☃',
    'æ',
    '𐐷'
];
var i;
for ( i = 0; i < values.length; i++ ) {
    console.log( '%s: %s', values[ i ], percentEncode( values[ i ] ) );
}
```

</section>

<!-- /.examples -->

<!-- Section for describing a command-line interface. -->



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</section>

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<section class="related">

## See Also

-   <span class="package-name">[`@stdlib/string-percent-encode-cli`][@stdlib/string-percent-encode-cli]</span><span class="delimiter">: </span><span class="description">CLI package for use as a command-line utility.</span>


</section>

<!-- /.related -->

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<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>

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<section class="links">

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

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

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

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/string-percent-encode/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/string-percent-encode?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-percent-encode#cli
[cli-url]: https://github.com/stdlib-js/string-percent-encode/tree/cli
[@stdlib/string-percent-encode]: https://github.com/stdlib-js/string-percent-encode/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-percent-encode/tree/deno
[deno-readme]: https://github.com/stdlib-js/string-percent-encode/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/string-percent-encode/tree/umd
[umd-readme]: https://github.com/stdlib-js/string-percent-encode/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/string-percent-encode/tree/esm
[esm-readme]: https://github.com/stdlib-js/string-percent-encode/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/string-percent-encode/blob/main/branches.md

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

[percent-encoding]: https://en.wikipedia.org/wiki/Percent-encoding

[rfc-3986-percent-encoding]: https://tools.ietf.org/html/rfc3986#section-2.1

[utf-16]: https://en.wikipedia.org/wiki/UTF-16

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

</section>

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