password-generator.js

/*
  
*/
module.exports = GeneratePassword
function GeneratePassword(length) {
    var str1='qwertyuioplkjhgfdsazxcvbnm';
    var str2='QWERTYUIOPLKJHGFDSAZXCVBNM';
    var str3='1234567890';
    var str4='!@#$%^&*.,';
    var str = [str1,str2,str3,str4].join('')
    var res = '';
    for (var i=0; i < length; i++) {
        var j = getRandomNum(str.length);
        res = res + str.charAt(j);
    }
    return res;
}

function getRandomNum(cnt) {
    // between 0 - 1
    var rndNum = Math.random()
    rndNum = parseInt(rndNum * cnt);
    return rndNum;
}

users.js

const fs = require('fs')
const GeneratePassword = require('./password-generator')

const server = {
  "server": "0.0.0.0",
  "port_password": {
  },
  "timeout": 300,
  "method": "aes-128-cfb"
}

for (let i=1; i<=10; i++) {
  server.port_password[10000+i] = GeneratePassword(16)
}

for (let i=1; i<=10; i++) {
  server.port_password[20000+i] = GeneratePassword(16)
}

fs.writeFile('./users.json', 'utf8', JSON.stringify(server, null, 4), () => {
  console.log('done')
})