# is-builtin-module [](https://travis-ci.org/sindresorhus/is-builtin-module) > Check if a string matches the name of a Node.js builtin module ## Install ``` $ npm install --save is-builtin-module ``` ## Usage ```js var isBuiltinModule = require('is-builtin-module'); isBuiltinModule('fs'); //=> true isBuiltinModule('unicorn'); //=> false :( ``` ## Related - [builtin-modules](https://github.com/sindresorhus/builtin-modules) - List of the Node.js builtin modules ## License MIT © [Sindre Sorhus](http://sindresorhus.com)