How do I pass command line arguments to a Node.js program?

Question

I have a web server written in Node.js and I would like to launch with a specific folder. I\'m not sure how to access arguments in JavaScript. I\'m running node like this:

Answer 1

whithout librairies: using Array.prototype.reduce()

const args = process.argv.slice(2).reduce((acc, arg) => {

    let [k, v = true] = arg.split('=')
    acc[k] = v
    return acc

}, {})

for this command node index.js count=2 print debug=false msg=hi

console.log(args) // { count: '2', print: true, debug: 'false', msg: 'hi' }

also,

we can change

    let [k, v = true] = arg.split('=')
    acc[k] = v

by (much longer)

    let [k, v] = arg.split('=')
    acc[k] = v === undefined ? true : /true|false/.test(v) ? v === 'true' : /[\d|\.]+/.test(v) ? Number(v) : v

to auto parse Boolean & Number

console.log(args) // { count: 2, print: true, debug: false, msg: 'hi' }