Check if the runtime is Node.js.
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> Check if the runtime is [Node.js][node-js].
``bash`
npm install @stdlib/assert-is-node
`javascript`
var IS_NODE = require( '@stdlib/assert-is-node' );
#### IS_NODE
Boolean indicating if the runtime is [Node.js][node-js].
`javascript`
var bool = IS_NODE;
// returns
- In order to determine whether the runtime is [Node.js][node-js], 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).
`javascript
var IS_NODE = require( '@stdlib/assert-is-node' );
console.log( IS_NODE );
// =>
`
*
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].
[npm-image]: http://img.shields.io/npm/v/@stdlib/assert-is-node.svg
[npm-url]: https://npmjs.org/package/@stdlib/assert-is-node
[test-image]: https://github.com/stdlib-js/assert-is-node/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/assert-is-node/actions/workflows/test.yml?query=branch:v0.2.3
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/assert-is-node/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/assert-is-node?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-node/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-is-node/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-is-node/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-is-node/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-is-node/tree/esm
[esm-readme]: https://github.com/stdlib-js/assert-is-node/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/assert-is-node/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-node/main/LICENSE
[node-js]: https://nodejs.org/en/
[mdn-csp]: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP