The document discusses the advantages and disadvantages of using Node.js as a server-side language, emphasizing its asynchronous I/O capabilities and event-driven architecture. It includes examples of basic server creation, the use of npm for package management, and mentions notable case studies of organizations like LinkedIn that have successfully adopted Node.js. Additionally, it advises that while Node.js is effective for handling many requests, it may not perform optimally for CPU-intensive tasks.

1. Server Side Apocalypse, JS

2. About Me
Md. Sohel Rana
Founder, NerdDevs
http://www.nerddevs.com
twitter : @sohel023010
skype : sohel023010
http://blog.sohel.me

3. Client
Browser
A Desktop App
Rest Client
Server? Yes!

4. Server
Serves data, images, files, audio, video etc.
Sometimes foods as well! Foodpanda J

5. 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

6. 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

7. 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

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

9. 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

10. 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);

11. 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"
}

12. 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

13. 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

14. 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.