nodejs file append get logged in user info

fileplay.js

console.log("starting app")

const fs = require('fs')
const os = require('os')

var user = os.userInfo();




fs.appendFile("test.txt", 'i hate everything, my name is '+user["username"]+"\n", (err) => {
    if(err){
        console.log("could not write")
    }
})