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<article class="markdown-body entry-content" itemprop="mainContentOfPage"><h1>
<a name="parse5" class="anchor" href="#parse5"><span class="octicon octicon-link"></span></a>parse5</h1>

<p>Fast full-featured HTML parser for Node. Based on WHATWG HTML5 specification.<br>
To build <a href="http://testcafe.devexpress.com/">TestCafé</a> we needed fast and ready for production HTML parser for node.js, which will parse HTML as a modern browser's parser.
Existing solutions were either too slow or their output was too inaccurate. So, this is how parse5 was born.</p>

<h2>
<a name="install" class="anchor" href="#install"><span class="octicon octicon-link"></span></a>Install</h2>

<pre><code>$ npm install parse5
</code></pre>

<h2>
<a name="usage-and-api" class="anchor" href="#usage-and-api"><span class="octicon octicon-link"></span></a>Usage and API</h2>

<div class="highlight highlight-js"><pre><span class="kd">var</span> <span class="nx">Parser</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'parse5'</span><span class="p">).</span><span class="nx">Parser</span><span class="p">;</span>

<span class="c1">//Instantiate parser</span>
<span class="kd">var</span> <span class="nx">parser</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Parser</span><span class="p">();</span>

<span class="c1">//Then feed it with an HTML document</span>
<span class="kd">var</span> <span class="nb">document</span> <span class="o">=</span> <span class="nx">parser</span><span class="p">.</span><span class="nx">parse</span><span class="p">(</span><span class="s1">'&lt;!DOCTYPE html&gt;&lt;html&gt;&lt;head&gt;&lt;/head&gt;&lt;body&gt;Hi there!&lt;/body&gt;&lt;/html&gt;'</span><span class="p">)</span>

<span class="c1">//Now let's parse HTML-snippet</span>
<span class="kd">var</span> <span class="nx">fragment</span> <span class="o">=</span> <span class="nx">parser</span><span class="p">.</span><span class="nx">parseFragment</span><span class="p">(</span><span class="s1">'&lt;title&gt;Parse5 is &amp;#102;&amp;#117;&amp;#99;&amp;#107;ing awesome!&lt;/title&gt;&lt;h1&gt;42&lt;/h1&gt;'</span><span class="p">);</span>

</pre></div>

<h2>
<a name="is-it-fast" class="anchor" href="#is-it-fast"><span class="octicon octicon-link"></span></a>Is it fast?</h2>

<p>Check out <a href="https://github.com/inikulin/node-html-parser-bench">this benchmark</a>.</p>

<pre><code>Starting benchmark. Fasten your seatbelts...
html5 (https://github.com/aredridel/html5) x 0.18 ops/sec ±5.92% (5 runs sampled)
htmlparser (https://github.com/tautologistics/node-htmlparser/) x 3.83 ops/sec ±42.43% (14 runs sampled)
htmlparser2 (https://github.com/fb55/htmlparser2) x 4.05 ops/sec ±39.27% (15 runs sampled)
parse5 (https://github.com/inikulin/parse5) x 3.04 ops/sec ±51.81% (13 runs sampled)
Fastest is htmlparser2 (https://github.com/fb55/htmlparser2),parse5 (https://github.com/inikulin/parse5)
</code></pre>

<p>So, parse5 is as fast as simple specification incompatible parsers and ~15-times(!) faster than the current specification compatible parser available for the node.</p>

<h2>
<a name="testing" class="anchor" href="#testing"><span class="octicon octicon-link"></span></a>Testing</h2>

<p>Test data is adopted from <a href="https://github.com/html5lib">html5lib project</a>. Parser is covered by more than 8000 test cases.
To run tests:</p>

<pre><code>$ node test/run_tests.js
</code></pre>

<h2>
<a name="custom-tree-adapter" class="anchor" href="#custom-tree-adapter"><span class="octicon octicon-link"></span></a>Custom tree adapter</h2>

<p>You can create a custom tree adapter so parse5 can work with your own DOM-tree implementation.
Just pass your adapter implementation to the parser's constructor as an argument:</p>

<div class="highlight highlight-js"><pre><span class="kd">var</span> <span class="nx">Parser</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'parse5'</span><span class="p">).</span><span class="nx">Parser</span><span class="p">;</span>

<span class="kd">var</span> <span class="nx">myTreeAdapter</span> <span class="o">=</span> <span class="p">{</span>
<span class="c1">//Adapter methods...</span>
<span class="p">};</span>

<span class="c1">//Instantiate parser</span>
<span class="kd">var</span> <span class="nx">parser</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Parser</span><span class="p">(</span><span class="nx">myTreeAdapter</span><span class="p">);</span>
</pre></div>

<p>Sample implementation can be found <a href="https://github.com/inikulin/parse5/blob/master/lib/default_tree_adapter.js">here</a>.
The custom tree adapter should implement all methods exposed via <code>exports</code> in the sample implementation.</p>

<h2>
<a name="questions-or-suggestions" class="anchor" href="#questions-or-suggestions"><span class="octicon octicon-link"></span></a>Questions or suggestions?</h2>

<p>If you have any questions, please feel free to create an issue <a href="https://github.com/inikulin/parse5/issues">here on github</a>.</p>

<h2>
<a name="author" class="anchor" href="#author"><span class="octicon octicon-link"></span></a>Author</h2>

<p><a href="https://github.com/inikulin">Ivan Nikulin</a> (<a href="mailto:ifaaan@gmail.com">ifaaan@gmail.com</a>)</p>

<p><a href="https://bitdeli.com/free" title="Bitdeli Badge"><img src="https://d2weczhvl823v0.cloudfront.net/inikulin/parse5/trend.png" alt="Bitdeli Badge" style="max-width:100%;"></a></p></article>
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