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<p>Node.js is a platform built on <a
href="http://code.google.com/p/v8/">Chrome's JavaScript runtime</a>
for easily building fast, scalable network applications. Node.js
uses an event-driven, non-blocking I/O model that makes it
lightweight and efficient, perfect for data-intensive real-time
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<h2>Node.js in the Industry</h2>
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<li class="microsoft"><img src="http://nodejs.org/images/microsoft-logo.png">
<p>Node gives Azure users the first end-to-end JavaScript
experience for the development of a whole new class of real-time
applications.
<br>
<a href="https://www.windowsazure.com/en-us/develop/nodejs">Claudio Caldato</a>
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<span>Principal Program Manager, Microsoft Open Technologies, Inc.</span></p>
</li>
<li class="ebay"><img src="http://nodejs.org/images/ebay-logo.png">
<p>Node’s evented I/O model freed us from worrying about locking
and concurrency issues that are common with multithreaded async
I/O.
<br>
<a href="http://www.ebaytechblog.com/2011/11/30/announcing-ql-io/">Subbu Allamarju</a>
<br>
<span>Principal Member, Technical Staff</span></p></li>
<li class="linkedin"><img src="http://nodejs.org/images/linkedin-logo.png">
<p>On the server side, our entire mobile software stack is
completely built in Node. One reason was scale. The second is
Node showed us huge performance gains.
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<a href="http://venturebeat.com/2011/08/16/linkedin-node/">Kiran Prasad</a>
<br>
<span>Director of Engineering, Mobile</span></p></li>
<li class="yahoo"><img src="http://nodejs.org/images/yahoo-logo.png">
<p>Node.js is the execution core of Manhattan. Allowing
developers to build one code base using one language – that is
the nirvana for developers.
<br>
<a href="http://developer.yahoo.com/blogs/ydn/posts/2011/11/yahoo-announces-cocktails-%E2%80%93-shaken-not-stirred/">Renaud Waldura</a>
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<span>Sr. Product Manger, Cocktail</span></p></li>
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<h2>An example: Webserver</h2>
<p>This simple web server written in Node responds with "Hello World" for every request.</p>
<pre>
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');</pre>
<p>To run the server, put the code into a file
<code>example.js</code> and execute it with the
<code>node</code> program from the command line:</p>
<pre class="sh_none">
% node example.js
Server running at http://127.0.0.1:1337/</pre>
<p>Here is an example of a simple TCP server which listens on port 1337 and echoes whatever you send it:</p>
<pre>
var net = require('net');
var server = net.createServer(function (socket) {
socket.write('Echo server\r\n');
socket.pipe(socket);
});
server.listen(1337, '127.0.0.1');</pre>
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<h2>Featured</h2>
<a href="http://www.youtube.com/watch?v=jo_B4LTHi3I"><img src="http://nodejs.org/images/ryan-speaker.jpg"></a>
A guided introduction to Node
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