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# which-module > Find the module object for something that was require()d [](https://travis-ci.org/nexdrew/which-module) [](https://coveralls.io/github/nexdrew/which-module?branch=master) [](https://github.com/conventional-changelog/standard-version) Find the `module` object in `require.cache` for something that was `require()`d or `import`ed - essentially a reverse `require()` lookup. Useful for libs that want to e.g. lookup a filename for a module or submodule that it did not `require()` itself. ## Install and Usage ``` npm install --save which-module ``` ```js const whichModule = require('which-module') console.log(whichModule(require('something'))) // Module { // id: '/path/to/project/node_modules/something/index.js', // exports: [Function], // parent: ..., // filename: '/path/to/project/node_modules/something/index.js', // loaded: true, // children: [], // paths: [ '/path/to/project/node_modules/something/node_modules', // '/path/to/project/node_modules', // '/path/to/node_modules', // '/path/node_modules', // '/node_modules' ] } ``` ## API ### `whichModule(exported)` Return the [`module` object](https://nodejs.org/api/modules.html#modules_the_module_object), if any, that represents the given argument in the `require.cache`. `exported` can be anything that was previously `require()`d or `import`ed as a module, submodule, or dependency - which means `exported` is identical to the `module.exports` returned by this method. If `exported` did not come from the `exports` of a `module` in `require.cache`, then this method returns `null`. ## License ISC © Contributors