Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows JavaScript to run on the server-side and is used for building scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, as well as packaged modules to help build everything from web servers to utilities. Popular Node.js frameworks include Express and Restler for building web servers and APIs.

1. JavaScript on the Server Side

2. I’m arunoda

3. Introduction Framework to built Servers It’s about JavaScript Created by Ryan Dhal in 2009

4. Architecture JavaScript C++ NodeJS bindings (http, socket, IO etc..) Event LoopLibEV Thread PoolLibIO JS EngineV8

5. Programming model Evented - No Threads Non Blocking IO Use of callbacks (closure) db.insert({data:1000}, function(err) { //do something after inserted }) console.log("I don't wait");

6. Support Commercial – Community – Mainly over Just 2 years old ~2500 modules ~800 authors ~300 new modules per month ~2000 new module updates per month

7. Web and nodejs Websites Connect Express REST API Express Geddy Communication Socket IO Now JS (RPC) Dnode (RPC) HTTP API - RESTler

8. Express - sample var app = express.createServer(); app.get('/info', function(req, res){ res.send('Hello World'); }); app.listen(3000);

9. NOWJS - Sample Server.js var server= require("http").createServer(); varnowjs = require("now"); var remote= nowjs.initialize(httpServer); remote.now.getServerInfo = function(callback){ getInfo(callback); } server.listen(8000); Access.html <script> now.getServerInfo(function(data){ //do something with the data }); </script>

10. RESTler - Sample var rest = require("restler"); rest.get("http://google.com").on("complete", function(data) { console.log(data); });

11. Database support

12. Package manager It’s called NPM Like ivy But with JSON npm install express npm publish

13. IDE It’s BAD No great debugger Cloud9 IDE Sublime Text 2

14. HOSTING

15. NODEJS Experience Started 3 months back Rewritten Yalu on NodeJS Improved Performance Projects on

16. Usefull links NodeJS Sri Lanka bit.ly/nodelk Node Links bit.ly/node-info

17. Thanks Any Questions?