commander.js

tj/commander.js is an open-source project by tj: node.js command-line interfaces made easy. Indexed here so it can be found — not resold.

It is free. Get it from the upstream repository: https://github.com/tj/commander.js

From the project's own README (excerpt, reproduced for discovery under its MIT license):

Commander.js

The complete solution for node.js command-line interfaces.

Read this in other languages: English 简体中文 • Commander.js • Installation • Quick Start • Declaring program variable • Options • Common option types, boolean and value • Default option value • Other option types, negatable boolean and boolean value • Required option • Variadic option • Version option • More configuration • Custom option processing • Commands • Command-arguments • More configuration • Custom argument processing • Action handler • Stand-alone executable (sub)commands • Life cycle hooks • Automated help • Custom help • Display help after errors • Display help from code • .name • .usage • .description and .summary • .helpOption(flags, description) • .helpCommand() • Help Groups • More configuration • Custom event listeners • Bits and pieces • .parse() and .parseAsync() • Parsing Configuration • Legacy options as properties • TypeScript • createCommand() • Node options such as --harmony • Debugging stand-alone executable subcommands • npm run-script • Display error • Override exit and output handling • Additional documentation • Support • Commander for enterprise

For information about terms used in this document see: terminology

Installation

Quick Start

You write code to describe your command line interface. Commander looks after parsing the arguments into options and command-arguments, displays usage errors for problems, and implements a help system.

Commander is strict and displays an error for unrecognised options. The two most used option types are a boolean option, and an option which takes its value from the following argument.

Example file: split.js

Here is a more complete program using a subcommand and with descriptions for the help. In a multi-command…