How to Build Password Generator in Node.js

In this post, we will be building a simple password generator in Node.js. The whole source code of the application will be given below. You can see the source code and understand it and try to extend it according to your needs.

package.json

{
    "name": "simple-password-generator",
    "version": "1.1.0",
    "description": "A simple password generator for Node.js . It allows you to create random and secure passwords on the fly.",
    "keywords": [
        "password",
        "generator",
        "simple"
    ],
    "repository": {
        "type": "git",
        "url": "https://github.com/edmarriner/simple-password-generator.git"
    },
    "author": {
        "name": "EdwardMarriner",
        "email": "edmarriner@gmail.com",
        "url": "http://www.edwardmarriner.co.uk/"
    },
    "licenses": [
        {
            "type": "MIT",
            "url": "https://raw.github.com/edmarriner/simple-password-generator/master/LICENSE"
        }
    ]
}

This is the package json file for the application. It can also be alternatively created by issuing node command such as npm init it will ask basic questions and you have to answer and it will create the file for you.

example.js

!(function(){

    var spg = require('./simple-password-generator.js');

    console.log(spg.generate({
        length : 3
    }));

})();

simple-password-generator.js

!(function(){

    _ = require('lodash-node');

    // Password defaults
    var defaults = {
        length : 8
    };

    /*
     * Generates a random password.
     */
    exports.generate = function(userOptions)
    {
        var options = _.assign(defaults, userOptions);

        // Generate a random number.
        var number = Math.random()

        // Convert this number into a string.
        var string = number.toString(36)

        // Grab a section of the string as the password
        var password = string.slice(-defaults['length']);

        // Return the password back!
        return password;
    }

})();

Download Source Code here

Thank you for reading!