Server Side Apocalypse, JS

About Me

Md. Sohel Rana Founder, NerdDevs http://www.nerddevs.com twitter : @sohel023010 skype : sohel023010

http://blog.sohel.me

Client

  Browser

  A Desktop App

  Rest Client

  Server? Yes!

Server

  Serves data, images, files, audio, video etc.

  Sometimes foods as well! Foodpanda J

Server Side Scripting

  ASP, ASP.NET, Java, PHP, Haskell, Perl, Python, Ruby and so on!

  And also JavaScript

  JavaScript brought non-blocking IO

  It changed the way how server works

  We got NodeJS

NodeJS

  A runtime environment to support JavaScript as server side language

  Built on V8-JavaScript Engine of Chrome, Fast

  Event-driven, non-blocking I/O

NodeJS

  Advantages over others - Asynchronous I/O, more request can server - JavaScript as a Server Side language - Event Driven - Callbacks - A good package manager “NPM”

  Disadvantages - Single threaded - Lack of standard libraries

NodeJS

An http server : var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World\n'); }).listen(9000, '127.0.0.1'); console.log('Server running at http://127.0.0.1:9000/');

Node Modules

  A functional unit that performs specified actions

  Loaded using require(‘module_name’)

  Usually placed at node_modules folder

  Non-native modules loaded searching upwards

Node Modules

A simple module :

// “modules/calculator.js” exports.add = function(a, b){ return a+b ; }; exports.subtract = function(a, b){ return a-b; }; var Calculator = require('./module/calculator.js'); var addTwoNumber = Calculator.add(5,7);

NPM

  NPM- nodejs package manager

  Used for install/uninstall node programs

  Can be used to install dependencies

package.json is used to define dependencies

//pakage.json { "name": "backbone-express-boilerplate", "version": "1.0.0", "scripts": { "start": "node ./server/bin/www" }, "dependencies": { "express": "^4.12.3", "body-parser": "~1.12.0", "cookie-parser": "~1.3.4", "jade": "~1.9.2", "serve-favicon": "~2.2.0" }, "repository": { "type": "git", "url": "https://github.com/sohel-rana/backbone-express-boilerplate.git" }, "author": "Sohel Rana”, "bugs": { "url": "https://github.com/sohel-rana/backbone-express-boilerplate/issues" }, "homepage": "https://github.com/sohel-rana/backbone-express-boilerplate" }

Web Frameworks

NodeJS provides core modules

  Requires lots of effort for web apps

  Express, Sails etc. provides lots of feature top of it

  Makes the project manageable

Case Studies

  LinkedIn moved from Rails to Node, reduced their server uses from 30 to 3

  Microsoft, Walmart, eBay, Paypal all uses nodejs for some of their services

  And there are many more here

Throw all?

  Throw all other and use NodeJS? NO!

NodeJS is good to handle many request.

  But will not perform well when we need more CPU

  Suitable for real-time applications

  Chat, online games , collaboration tools etc.