Introduction to Node js

Introduction to
Node.JS
Pragnesh Vaghela | @technologythree | technologythree.com

Problem
what’s a really common thing to do in a web application?
Database access, of course. Too bad database I/O is one of the
slowest things a web app has to deal with
data = readFromDatabase();
printData(data);

doSomethingUnrelated();

asynchronous JavaScript:
readFromDatabase(function(data) {
printData(data);
})

doSomethingUnrelated();

@ 2013 Technology Three 2

NODE.JS

1. platform built on Chrome's JavaScript runtime for
easily building fast, scalable network applications
2. perfect for data-intensive real-time applications that
run across distributed devices


NODE.JS
1. server-side JavaScript framework - the same type of
code that powers awesome Ajax applications like
Gmail will now power its servers, too
2. driven by asynchronous design - that it doesn’t have
to wait for slow file I/O or database operations to
continue processing, which makes it really damn
fast. It also means that it can handle millions of
concurrent connections at once
3. real-time applications - you do not have to bother
with low-level sockets and protocols


Bad Use Cases
1. apps that are very heavy on CPU usage, and very
light on actual I/O - video encoding software,
artificial intelligence or similar CPU hungry software
2. simple CRUD / HTML apps


Good Use Cases
• JSON APIs
building light-weight REST / JSON api's is something where
node.js really shines. Its non-blocking I/O model combined
with JavaScript make it a great choice for wrapping other data
sources such as databases or web services and exposing them
via a JSON interface

• Single page Apps
if you are planning to write an AJAX heavy single page app
(think gmail), node.js is a great fit as well. The ability to
process many requests / seconds with low response times, as
well as sharing things like validation code between the client
and server make it a great choice for modern web
applications that do lots of processing on the client

Good Use Cases

• Streaming data
one great example is parsing file uploads in real time, as well
as building proxies between different data layers

• Soft Realtime Applications
easy to develop soft real time systems like twitter, chat
software, sport bets or interfaces to instant messaging
networks


Example Web Server
var http = require('http');

http.createServer(function (request, response) {
response.writeHead(200, {'Content-Type': 'text/plain'});
response.end('Hello Worldn');
}).listen(8124);

console.log('Server running at http://127.0.0.1:8124/');

To run the server, put the code into a file called example.js and
execute it with the node program:

> node example.js
Server running at http://127.0.0.1:8124/


Real world Node.JS
Applications


NODE.JS in the industry
1. CBS, Linkedin use Node.js for mobile
2. Walmart’s Node-powered mobile app front-end code
gets executed on the back end
3. Yahoo has released some things for Node, and supports
cocktails - a Node.js platform. It also uses Node.js in the
livestand infrastructure
4. Mozilla has implemented Node.js to support browser
APIs which has half a billion installs
5. Pinterest uses Node as a webserver in some instances
6. Ebay hosts their HTTP API service with Node
7. HP uses Node for their WebOS initiatives


Thank You

Pragnesh Vaghela | @technologythree | technologythree.com

Introduction to Node js

More Related Content

What's hot

Viewers also liked

Similar to Introduction to Node js

Recently uploaded

Introduction to Node js