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<h1 class="lined-header"><span>cowboy_req:parse_qs(3)</span></h1>

<div class="sect1">
<h2 id="_name">Name</h2>
<div class="sectionbody">
<div class="paragraph"><p>cowboy_req:parse_qs - Parse the query string</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="font-weight: bold"><span style="color: #000000">parse_qs</span></span>(<span style="color: #009900">Req</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:req</span></span>())
    <span style="color: #990000">-&gt;</span> [{<span style="color: #009900">Key</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="color: #009900">Value</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>() | <span style="color: #000080">true</span>}]</tt></pre></div></div>
<div class="paragraph"><p>Parse the query string as a list of key/value pairs.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_arguments">Arguments</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Req
</dt>
<dd>
<p>
The Req object.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">Return value</h2>
<div class="sectionbody">
<div class="paragraph"><p>The parsed query string is returned as a list of key/value pairs.
The key is a binary string. The value is either a binary string,
or the atom <code>true</code>. Both key and value are case sensitive.</p></div>
<div class="paragraph"><p>The atom <code>true</code> is returned when a key is present in the query
string without a value. For example, in the following URIs
the key <code>&lt;&lt;"edit"&gt;&gt;</code> will always have the value <code>true</code>:</p></div>
<div class="ulist"><ul>
<li>
<p>
<code>/posts/42?edit</code>
</p>
</li>
<li>
<p>
<code>/posts/42?edit&amp;exclusive=1</code>
</p>
</li>
<li>
<p>
<code>/posts/42?exclusive=1&amp;edit</code>
</p>
</li>
<li>
<p>
<code>/posts/42?exclusive=1&amp;edit&amp;from=web</code>
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_changelog">Changelog</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
<strong>2.0</strong>: The parsed value is not longer cached in the Req object.
</p>
</li>
<li>
<p>
<strong>2.0</strong>: Only the parsed query string is returned, it is no longer wrapped in a tuple.
</p>
</li>
<li>
<p>
<strong>2.0</strong>: Function introduced. Replaces <code>qs_val/1</code> and <code>qs_vals/1</code>.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">Examples</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="title">Parse the query string and convert the keys to atoms</div>
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #009900">ParsedQs</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:parse_qs</span></span>(<span style="color: #009900">Req</span>),
<span style="color: #009900">AtomsQs</span> <span style="color: #990000">=</span> [{<span style="font-weight: bold"><span style="color: #000000">binary_to_existing_atom</span></span>(<span style="color: #009900">K</span>, <span style="color: #FF6600">latin1</span>), <span style="color: #009900">V</span>}
    || {<span style="color: #009900">K</span>, <span style="color: #009900">V</span>} <span style="color: #990000">&lt;-</span> <span style="color: #009900">ParsedQs</span>]<span style="color: #990000">.</span></tt></pre></div></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">See also</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="../cowboy_req">cowboy_req(3)</a>,
<a href="../cowboy_req.qs">cowboy_req:qs(3)</a>,
<a href="../cowboy_req.match_qs">cowboy_req:match_qs(3)</a></p></div>
</div>
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