# is-builtin-module > Check if a string matches the name of a Node.js builtin module ## Install ``` $ npm install is-builtin-module ``` ## Usage ```js const isBuiltinModule = require('is-builtin-module'); isBuiltinModule('fs'); //=> true isBuiltinModule('fs/promises'); //=> true isBuiltinModule('node:fs/promises'); //=> true isBuiltinModule('unicorn'); //=> false ``` ## Related - [builtin-modules](https://github.com/sindresorhus/builtin-modules) - List of the Node.js builtin modules ---
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