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    1.2.6 • Public • Published


    parse argument options

    This module is the guts of optimist's argument parser without all the fanciful decoration.


    var argv = require('minimist')(process.argv.slice(2));
    $ node example/parse.js -a beep -b boop
    { _: [], a: 'beep', b: 'boop' }
    $ node example/parse.js -x 3 -y 4 -n5 -abc --beep=boop foo bar baz
    { _: [ 'foo', 'bar', 'baz' ],
      x: 3,
      y: 4,
      n: 5,
      a: true,
      b: true,
      c: true,
      beep: 'boop' }


    Previous versions had a prototype pollution bug that could cause privilege escalation in some circumstances when handling untrusted user input.

    Please use version 1.2.6 or later:


    var parseArgs = require('minimist')

    var argv = parseArgs(args, opts={})

    Return an argument object argv populated with the array arguments from args.

    argv._ contains all the arguments that didn't have an option associated with them.

    Numeric-looking arguments will be returned as numbers unless opts.string or opts.boolean is set for that argument name.

    Any arguments after '--' will not be parsed and will end up in argv._.

    options can be:

    • opts.string - a string or array of strings argument names to always treat as strings

    • opts.boolean - a boolean, string or array of strings to always treat as booleans. if true will treat all double hyphenated arguments without equal signs as boolean (e.g. affects --foo, not -f or --foo=bar)

    • opts.alias - an object mapping string names to strings or arrays of string argument names to use as aliases

    • opts.default - an object mapping string argument names to default values

    • opts.stopEarly - when true, populate argv._ with everything after the first non-option

    • opts['--'] - when true, populate argv._ with everything before the -- and argv['--'] with everything after the --. Here's an example:

      > require('./')('one two three -- four five --six'.split(' '), { '--': true })
      { _: [ 'one', 'two', 'three' ],
        '--': [ 'four', 'five', '--six' ] }

      Note that with opts['--'] set, parsing for arguments still stops after the --.

    • opts.unknown - a function which is invoked with a command line parameter not defined in the opts configuration object. If the function returns false, the unknown option is not added to argv.


    With npm do:

    npm install minimist




    npm i minimist

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