Password Generator

passwordGen.js

#!/usr/bin/env node

var passwordLength = 20;
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()_+-=[]{}\\|:;\"'<,>.?/'\"";

if (typeof process.argv[2] !== 'undefined') {
    passwordLength = parseInt(process.argv[2]);

    if (passwordLength < 10) {
        console.log('You should really use a larger password.');
    }
}

var makePassword = function () {
        var text = "";

        for (var i = 0; i < passwordLength; i++) {
            text += possible.charAt(Math.floor(Math.random() * possible.length));
        }

        return text;
};


console.log('Permutations possible: ' + Math.pow(possible.length, passwordLength));

for (var x = 0; x < 5; x++) {
    console.log(makePassword() + '    ' + makePassword() + '    ' + makePassword());
}

TODO: math.random is not crypto secure, use https://nodejs.org/api/crypto.html#crypto_crypto_randombytes_size_callback
uses a higher quality entropy source