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# detect-file [](https://www.npmjs.com/package/detect-file) [](https://npmjs.org/package/detect-file) [](https://npmjs.org/package/detect-file) [](https://travis-ci.org/doowb/detect-file) [](https://ci.appveyor.com/project/doowb/detect-file)
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> Detects if a file exists and returns the resolved filepath.
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save detect-file
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```
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Install with [yarn](https://yarnpkg.com):
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```sh
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$ yarn add detect-file
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```
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## Usage
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```js
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var detect = require('detect-file');
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```
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## API
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### [detect](index.js#L33)
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Detect the given `filepath` if it exists.
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**Params**
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* `filepath` **{String}**: filepath to detect.
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* `options` **{Object}**: Additional options.
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* `options.nocase` **{Boolean}**: Set this to `true` to force case-insensitive filename checks. This is useful on case sensitive file systems.
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* `returns` **{String}**: Returns the detected filepath if it exists, otherwise returns `null`.
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**Example**
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```js
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var res = detect('package.json');
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console.log(res);
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//=> "package.json"
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var res = detect('fake-file.json');
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console.log(res)
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//=> null
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```
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## Case sensitive file systems
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When using the `nocase` option, this library will attempt to detect the filepath with the following methods:
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1. Try to read all files in the `filepath` using `fs.readdirSync`. If successful and `filepath` is a directory, return the `filepath`.
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2. Try to read all files in the `filepath`'s directory using `fs.readdirSync`. If successful, do case insensitive comparasions of the `filepath` to the files in `filepath`'s directory.
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## About
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### Related projects
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[fs-exists-sync](https://www.npmjs.com/package/fs-exists-sync): Drop-in replacement for `fs.existsSync` with zero dependencies. Other libs I found either have crucial differences… [more](https://github.com/jonschlinkert/fs-exists-sync) | [homepage](https://github.com/jonschlinkert/fs-exists-sync "Drop-in replacement for `fs.existsSync` with zero dependencies. Other libs I found either have crucial differences from fs.existsSync, or unnecessary dependencies. See README.md for more info.")
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### Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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### Building docs
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_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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### Running tests
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Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
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```sh
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$ npm install && npm test
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```
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### Author
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**Brian Woodward**
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* [github/doowb](https://github.com/doowb)
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* [twitter/doowb](https://twitter.com/doowb)
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### License
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Copyright © 2017, [Brian Woodward](https://github.com/doowb).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on August 05, 2017._
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