npm package: @stdlib/assert-is-hex-string
Description: Test whether a string contains only hexadecimal digits.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
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# isHexString

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

> Test whether a string contains only hexadecimal digits.

<section class="installation">

## Installation

```bash
npm install @stdlib/assert-is-hex-string
```

</section>

<section class="usage">

## Usage

```javascript
var isHexString = require( '@stdlib/assert-is-hex-string' );
```

#### isHexString( value )

Tests whether a string contains only hexadecimal digits.

```javascript
var bool = isHexString( '0123456789abcdefABCDEF' );
// returns true
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   For non-string values, the function returns `false`.
-   The function does **not** recognize `x` (as in the standard `0x` prefix).

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var isHexString = require( '@stdlib/assert-is-hex-string' );

var out = isHexString( '0123456789abcdefABCDEF' );
// returns true

out = isHexString( '' );
// returns false

out = isHexString( '0xffffff' );
// returns false

out = isHexString( 123 );
// returns false
```

</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/assert-is-hex-string-cli`][@stdlib/assert-is-hex-string-cli]</span><span class="delimiter">: </span><span class="description">CLI package for use as a command-line utility.</span>
-   <span class="package-name">[`@stdlib/assert-is-string`][@stdlib/assert/is-string]</span><span class="delimiter">: </span><span class="description">test if a value is a string.</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 -->

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<section class="links">

[@stdlib/assert-is-hex-string-cli]: https://www.npmjs.com/package/@stdlib/assert-is-hex-string-cli

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

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

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

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[chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg
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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/assert-is-hex-string#cli
[cli-url]: https://github.com/stdlib-js/assert-is-hex-string/tree/cli
[@stdlib/assert-is-hex-string]: https://github.com/stdlib-js/assert-is-hex-string/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/assert-is-hex-string/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-is-hex-string/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-is-hex-string/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-is-hex-string/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-is-hex-string/tree/esm
[esm-readme]: https://github.com/stdlib-js/assert-is-hex-string/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/assert-is-hex-string/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-hex-string/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/assert/is-string]: https://www.npmjs.com/package/@stdlib/assert-is-string

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</section>

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