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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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ul {
padding: 0;
margin: 0;
}
</style>
<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js?ver=3.1.3'></script>
<script type="text/javascript" src="../sh_main.js"></script>
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<link type="image/x-icon" rel="icon" href="../favicon.ico" />
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title="node blog"
href="http://feeds.feedburner.com/nodejs/123123123"/>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>node.js</title>
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<img id="logo" src="../logo.png" alt="node.js"/>
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<div id="content" class="clearfix">
<div id="column1" class="interior">
<h2>About</h2>

<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>Node's goal is to provide an easy way to build scalable
network programs. In the "hello world" web server example
above, many client connections can be handled concurrently.
Node tells the operating system (through <code>epoll</code>,
<code>kqueue</code>, <code>/dev/poll</code>, or
<code>select</code>) that it should be notified when a new
connection is made, and then it goes to sleep. If someone new
connects, then it executes the callback. Each connection is
only a small heap allocation.</p>

<p>This is in contrast to today's more common concurrency
model where OS threads are employed. Thread-based networking
is relatively inefficient and very difficult to use. See: <a
href="http://www.kegel.com/c10k.html">this</a> and <a
href="http://bulk.fefe.de/scalable-networking.pdf">this</a>.
Node will show much better memory efficiency under high-loads
than systems which allocate 2mb thread stacks for each
connection. Furthermore, users of Node are free from worries
of dead-locking the process—there are no locks. Almost no
function in Node directly performs I/O, so the process never
blocks. Because nothing blocks, less-than-expert programmers
are able to develop fast systems.</p>

<p>Node is similar in design to and influenced by systems like
Ruby's <a href="http://rubyeventmachine.com/">Event
Machine</a> or Python's <a
href="http://twistedmatrix.com/">Twisted</a>. Node takes the
event model a bit further—it presents the event loop as a
language construct instead of as a library. In other systems
there is always a blocking call to start the event-loop.
Typically one defines behavior through callbacks at the
beginning of a script and at the end starts a server through a
blocking call like <code>EventMachine::run()</code>. In Node
there is no such start-the-event-loop call. Node simply enters
the event loop after executing the input script. Node exits
the event loop when there are no more callbacks to perform.
This behavior is like browser javascript—the event loop is
hidden from the user.</p>

<p>HTTP is a first class protocol in Node. Node's HTTP library
has grown out of the author's experiences developing and
working with web servers. For example, streaming data through
most web frameworks is impossible. Node attempts to correct
these problems in its HTTP <a
href="https://github.com/joyent/http-parser/tree/master">parser</a>
and API. Coupled with Node's purely evented infrastructure, it
makes a good foundation for web libraries or frameworks.</p>

<p>But what about multiple-processor concurrency? Aren't
threads necessary to scale programs to multi-core computers?
You can start new processes via <code><a
href="http://nodejs.org/docs/latest/api/child_processes.html#child_process.fork">child_process.fork()</a></code>
these other processes will be scheduled in parallel. For load
balancing incoming connections across multiple processes use
<a href="http://nodejs.org/docs/latest/api/cluster.html">the
cluster module</a>.</p>

<p>See also:</p>
<ul>
<li><a href="http://s3.amazonaws.com/four.livejournal/20091117/jsconf.pdf">Slides from JSConf 2009</a></li>
<li><a href="http://nodejs.org/jsconf2010.pdf">Slides from JSConf 2010</a></li>
<li><a href="http://www.yuiblog.com/blog/2010/05/20/video-dahl/">Video from a talk at Yahoo in May 2010</a></li>
</ul>
<p><a href="/">Go back to the home page</a></p>
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<p>Copyright <a href="http://joyent.com">Joyent, Inc</a>, Node.js
is a <a href="trademark-policy.pdf">trademark of Joyent, Inc</a>.
</div>

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<script type="text/javascript" src="../sh_javascript.min.js"></script>
<link type="image/x-icon" rel="icon" href="../favicon.ico" />
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<title>node.js</title>
</head>
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<img id="logo" src="../logo.png" alt="node.js"/>
</div>
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<div id="column1" class="interior">
<p>Node's most valuable feature is the friendly and colorful community of developers. There are many places where this group congregates on the internet. This page attempts to highlight the best forums.</p>

<h2>Periodicals</h2>

<p><a href="http://howtonode.com/">How To Node</a> has a
growing number of useful tutorials. <a
href="http://planetnodejs.com">Planet Node</a> is an
aggregator of Node developer blogs. <a
href="http://nodeup.com/">NodeUp</a>
is a podcast covering the latest Node news in the
community. The <a
href="http://stackoverflow.com/questions/tagged/node.js">Stack
Overflow node.js tag</a> is collecting new information
every day.</p>


<h2>GitHub</h2>
<p>All development takes place at <a
href="http://github.com/joyent/node">http://github.com/joyent/node</a>.
The comments on commit messages are often source of heated
discussion regarding core development. The <a
href="http://github.com/joyent/node/wiki">GitHub Node
wiki</a> is full of useful links for newcomers. Don't
miss <a
href="https://github.com/joyent/node/wiki/Projects,-Applications,-and-Companies-Using-Node">Projects,
Applications, and Companies Using Node</a> or the <a
href="https://github.com/joyent/node/wiki/modules">very
long list of Node modules</a>, many of which are
published in the <a href="http://search.npmjs.org/">npm
registry</a>.</p>

<p><a href="http://notinventedhe.re/on/2011-7-26"><img
src="not-invented-here.png" width="100%" /></a> Bugs
should be reported to <a
href="https://github.com/joyent/node/issues">https://github.com/joyent/node/issues</a>.
Fixes to the code are welcome! Please see our <a
href="https://github.com/joyent/node/wiki/Contributing">contirbuting
guidelines</a> for information on how to submit a
patch.</p>

<h2>Mailing Lists</h2>

<p>The <a
href="http://groups.google.com/group/nodejs">user
mailing list</a> is used for announcements, discussion,
and flame wars about Node. The <a
href="http://groups.google.com/group/nodejs-dev">internal
development mailing list</a> is used for discussion of
internal design and feature proposals.</p>

<h2>IRC</h2>

<p>For real-time chat about Node development go to
<code>irc.freenode.net</code> in the <code>#node.js</code>
channel with an <a href="http://www.mirc.com">IRC</a> <a
href="http://colloquy.info/">client</a> or connect in
your web browser to the channel using <a
href="http://webchat.freenode.net/?channels=node.js">freenode's
WebChat</a>. Felix Geisendörfer keeps <a
href="http://nodejs.debuggable.com/">logs of the
channel</a> for those who miss a day.</p>

<h2>Conferences</h2>

<p><a href="http://www.nodeconf.com/">NodeCamp</a>
conferences are the main event in the United States; they
are organized by Mikeal Rogers. <a
href="http://nodefest.jp/">NodeFest (東京Node学園祭)</a>
is organized by the <a href="http://nodejs.jp">Node.js
Japan user group</a>. <a
href="http://nodecamp.de/">NodeCamp.de</a> in Cologne,
Germany is organized by <a href="railslove.de">Rails
Love</a>. An <a href="http://nodejsconf.it/">Italian
Node.js Conference</a> exists as well. <a
href="http://nodesummit.com/">Node Summit</a> is a
conference in San Francisco focusing on the adoption of
Node in larger companies. <a
href="http://jsconf.com/">JSConf</a> organizes the main
JavaScript conferences.</p>

<h2>Localized Sites</h2>

<p><code>nodejs.org</code> does not maintain any
translations into other languages. However there are
community websites in various languages with mailing lists
and translations of the website.</p>

<p><a href="http://nodejs.ru/">nodejs.ru</a> Russian blog.
<br/>
<a href="http://nodejs.ir">nodejs.ir</a> Iran group in Persian
<br/>
<a href="http://nodejs.jp/">nodejs.jp</a> Japan user group
<br/>
<a href="http://cnodejs.org">CNodeJS.org</a> Chinese community
<br/>
<a href="http://nodejs.co.il">nodejs.co.il</a> Israeli wiki
<br/>
<a href="http://nodejs.hk">HKNoJ</a> Hong Kong community
<br/>
<a href="http://nodejs.tw">nodejs.tw</a> Taiwan community</p>
<p><a href="/">Go back to the home page</a></p>
</div>
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<div id="footer">
<p>Copyright <a href="http://joyent.com">Joyent, Inc</a>, Node.js
is a <a href="trademark-policy.pdf">trademark of Joyent, Inc</a>.
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