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# Yargs [![Build Status][travis-image]][travis-url] [![Coverage Status][coveralls-image]][coveralls-url] [![NPM version][npm-image]][npm-url] [![Windows Tests][windows-image]][windows-url] [![js-standard-style][standard-image]][standard-url] [![Conventional Commits][conventional-commits-image]][conventional-commits-url] [![Slack][slack-image]][slack-url] _Having problems? want to contribute? join our [community slack](http://devtoolscommunity.herokuapp.com)_. > Yargs be a node.js library fer hearties tryin' ter parse optstrings. <img width="250" src="/yargs-logo.png"> Yargs helps you build interactive command line tools, by parsing arguments and generating an elegant user interface. It gives you: * commands and (grouped) options (`my-program.js serve --port=5000`). * a dynamically generated help menu based on your arguments. > <img width="400" src="/screen.png"> * bash-completion shortcuts for commands and options. * and [tons more](/docs/api.md). ## Installation ```bash npm i yargs --save ``` ## Simple Example ````javascript #!/opt/alt/alt-nodejs8/root/usr/bin/node const argv = require('yargs').argv if (argv.ships > 3 && argv.distance < 53.5) { console.log('Plunder more riffiwobbles!') } else { console.log('Retreat from the xupptumblers!') } ```` ```bash $ ./plunder.js --ships=4 --distance=22 Plunder more riffiwobbles! $ ./plunder.js --ships 12 --distance 98.7 Retreat from the xupptumblers! ``` ## Complex Example ```js #!/opt/alt/alt-nodejs8/root/usr/bin/node require('yargs') // eslint-disable-line .command('serve [port]', 'start the server', (yargs) => { yargs .positional('port', { describe: 'port to bind on', default: 5000 }) }, (argv) => { if (argv.verbose) console.info(`start server on :${argv.port}`) serve(argv.port) }) .option('verbose', { alias: 'v', default: false }) .argv ``` Run the example above with `--help` to see the help for the application. ## Table of Contents * [Yargs' API](/docs/api.md) * [Examples](/docs/examples.md) * [Parsing Tricks](/docs/tricks.md) * [Stop the Parser](/docs/tricks.md#stop) * [Negating Boolean Arguments](/docs/tricks.md#negate) * [Numbers](/docs/tricks.md#numbers) * [Arrays](/docs/tricks.md#arrays) * [Objects](/docs/tricks.md#objects) * [Advanced Topics](/docs/advanced.md) * [Composing Your App Using Commands](/docs/advanced.md#commands) * [Building Configurable CLI Apps](/docs/advanced.md#configuration) * [Customizing Yargs' Parser](/docs/advanced.md#customizing) * [Contributing](/contributing.md) [travis-url]: https://travis-ci.org/yargs/yargs [travis-image]: https://img.shields.io/travis/yargs/yargs/master.svg [coveralls-url]: https://coveralls.io/github/yargs/yargs [coveralls-image]: https://img.shields.io/coveralls/yargs/yargs.svg [npm-url]: https://www.npmjs.com/package/yargs [npm-image]: https://img.shields.io/npm/v/yargs.svg [windows-url]: https://ci.appveyor.com/project/bcoe/yargs-ljwvf [windows-image]: https://img.shields.io/appveyor/ci/bcoe/yargs-ljwvf/master.svg?label=Windows%20Tests [standard-image]: https://img.shields.io/badge/code%20style-standard-brightgreen.svg [standard-url]: http://standardjs.com/ [conventional-commits-image]: https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg [conventional-commits-url]: https://conventionalcommits.org/ [slack-image]: http://devtoolscommunity.herokuapp.com/badge.svg [slack-url]: http://devtoolscommunity.herokuapp.com