npm package: @stdlib/assert-is-browser
Description: Check if the runtime is a web browser.
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>
  <p>The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.</p>
  <p>When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.</p>
  <p>To join us in bringing numerical computing to the web, get started by checking us out on <a href="https://github.com/stdlib-js/stdlib">GitHub</a>, and please consider <a href="https://opencollective.com/stdlib">financially supporting stdlib</a>. We greatly appreciate your continued support!</p>
</details>

# IS_BROWSER

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

> Check if the runtime is a web browser.

<section class="installation">

## Installation

```bash
npm install @stdlib/assert-is-browser
```

</section>

<section class="usage">

## Usage

```javascript
var IS_BROWSER = require( '@stdlib/assert-is-browser' );
```

#### IS_BROWSER

`Boolean` indicating if the runtime is a web browser.

```javascript
var bool = IS_BROWSER;
// returns <boolean>
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   In order to determine whether the runtime is a web browser, the implementation must resolve the global scope, thus requiring function generation. The use of function generation may be problematic in browser contexts enforcing a strict [content security policy][mdn-csp] (CSP).

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var IS_BROWSER = require( '@stdlib/assert-is-browser' );

console.log( IS_BROWSER );
// => <boolean>
```

</section>

<!-- /.examples -->

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

<section class="related">

</section>

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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>

<!-- /.stdlib -->

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<section class="links">

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

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

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

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

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

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

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-browser/main/LICENSE

[mdn-csp]: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP

</section>

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