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commander

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commander

the complete solution for node.js command-line programs

  • 2.20.3
  • 2_x
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
162M
increased by5.82%
Maintainers
6
Weekly downloads
 
Created

What is commander?

The commander npm package is a complete solution for node.js command-line interfaces. It provides a simple and flexible way to write CLI tools, allowing developers to parse command-line arguments, define commands, and automatically generate help messages.

What are commander's main functionalities?

Command parsing

This feature allows you to define options and parse command-line arguments. The code sample demonstrates how to set up a simple CLI with options for debugging, pizza size, and pizza type.

const { program } = require('commander');
program.version('0.0.1');
program
  .option('-d, --debug', 'output extra debugging')
  .option('-s, --small', 'small pizza size')
  .option('-p, --pizza-type <type>', 'flavour of pizza');
program.parse(process.argv);
if (program.debug) console.log(program.opts());

Subcommands

Commander allows you to define subcommands for your CLI application. The code sample shows how to define three subcommands: install, search, and list, with list being the default command.

const { program } = require('commander');
program
  .command('install [name]', 'install one or more packages')
  .command('search [query]', 'search with optional query')
  .command('list', 'list packages installed', { isDefault: true })
  .parse(process.argv);

Custom help

You can customize the help output of your CLI tool. The code sample demonstrates how to change the default help option and add a custom help command.

const { program } = require('commander');
program
  .helpOption('-e, --HELP', 'read more information')
  .addHelpCommand('assist', 'display help for command');
program.parse(process.argv);

Action handler

Commander allows you to attach an action handler to a command. The code sample shows how to define a command that takes a required argument and attaches an action handler to it.

const { program } = require('commander');
program
  .command('start <service>')
  .description('start the service')
  .action(function(service) {
    console.log('Starting service:', service);
  });
program.parse(process.argv);

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Package last updated on 11 Oct 2019

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