GuillermoPena

//Read json object from json file.
//Write json object to json file

var fs   = require('fs')
var util = require('util')

// __dirname is folder where script is running
// NOTE: Use always " in json file content
var cfgFile = __dirname + "/anything.json"

GuillermoPena

// How wait inside of loop...

// Countdown
var counter = 10
var countdown = function() {
  console.log(counter)
  counter--
  return (counter > 0)
}

GuillermoPena

var crypto = require('crypto')

// Encrypt/Decrypt a string
var key     = "SecretKey"
  , message = "This is the text to cipher!"

// Encrypting
var cipher = crypto.createCipher('des-ede3-cbc', key)
  , cryptedMessage = cipher.update(message, 'utf8', 'hex')
cryptedMessage+= cipher.final('hex')

GuillermoPena

var varName1 = "varName2"
global[varName1] = "Hello World" // This is the important line ;)
var staticVarName = global[varName1] 

console.log("Var1: Name/Value : varName1/" + varName1)
console.log("Var2: Name/Value : " + varName1 + "/" + global[varName1])
console.log("Static Var: Name/Value : staticVarName/" + staticVarName)

GuillermoPena

var crypto     = require('crypto')
  , fs         = require('fs')

var sourceFile = __dirname + "/testFile.txt"
  , targetFile = __dirname + "/testEncryptedFile.txt"
  , key        = "SecretKey"
  , algorithm  = 'aes192' // Another algorithms: 'des-ede3-cbc'
  , cipher     = crypto.createCipher(algorithm, key)
  , decipher   = crypto.createDecipher(algorithm, key)
  , rs         = fs.ReadStream(sourceFile)

GuillermoPena

// How to encrypt/decrypt with ursa module (asymmetric cryptology)
var ursa     = require('ursa')
  , message  = 'Hello world!'
  , encoding = 'base64'

// Creating a pair of keys (a private key contains both keys...)
console.log('Generating Keys Pair...')
var keys = ursa.generatePrivateKey()

// Making a private key

GuillermoPena

// All you need to know about Mocha testing in 60 lines

// Mocha Testing: http://visionmedia.github.io/mocha/
// Installation: npm install -g mocha
// Run:     mocha [test folder or test file]
// Example: mocha . (Run all js tests in folder)
// 
// Usefull parameters:
// 	mocha -w . : Watch file changes and re-run tests
// 	mocha -d . : Debug mode

GuillermoPena

// How to send message from A user to B user, encrypting it (asymetric cryptology) and sign it

var ursa      = require('ursa')
  , message   = 'Hello world!'
  , encoding  = 'base64'
  , buffer    = new Buffer(message, 'ascii')

// Creating a pair of keys of user A (a private key contains both keys...)
console.log('Generating Keys Pair of user A...')
var keysA = ursa.generatePrivateKey()

GuillermoPena

// Managing websocket with socket.io
// Setting a web socket and sending a message from client to server.

// Server side
var app    = require('express')()
  , util   = require('util')
  , server = require('http').createServer(app)
  , io     = require('socket.io').listen(server)
  , port   = 8013

GuillermoPena

// How to create a simple web service with Express

// In App.js
// Dependencies
var express = require('express')
  , http    = require('http')
  , port    = 8080

// Application
var app = express()