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<div class="section" id="module-simplejson">
<h1 id="module-simplejson"><tt class="xref docutils literal"><span class="pre">simplejson</span></tt> — JSON encoder and decoder<a class="headerlink" href="#module-simplejson" title="Permalink to this headline">¶</a></h1>
<p>JSON (JavaScript Object Notation) <<a class="reference external" href="http://json.org">http://json.org</a>> is a subset of JavaScript
syntax (ECMA-262 3rd edition) used as a lightweight data interchange format.</p>
<p><tt class="xref docutils literal"><span class="pre">simplejson</span></tt> exposes an API familiar to users of the standard library
<tt class="xref docutils literal"><span class="pre">marshal</span></tt> and <tt class="xref docutils literal"><span class="pre">pickle</span></tt> modules. It is the externally maintained
version of the <tt class="xref docutils literal"><span class="pre">json</span></tt> library contained in Python 2.6, but maintains
compatibility with Python 2.5 and (currently) has
significant performance advantages, even without using the optional C
extension for speedups.</p>
<p>Encoding basic Python object hierarchies:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">([</span><span class="s">'foo'</span><span class="p">,</span> <span class="p">{</span><span class="s">'bar'</span><span class="p">:</span> <span class="p">(</span><span class="s">'baz'</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">,</span> <span class="mf">2</span><span class="p">)}])</span>
<span class="go">'["foo", {"bar": ["baz", null, 1.0, 2]}]'</span>
<span class="gp">>>> </span><span class="k">print</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="s">"</span><span class="se">\"</span><span class="s">foo</span><span class="se">\b</span><span class="s">ar"</span><span class="p">)</span>
<span class="go">"\"foo\bar"</span>
<span class="gp">>>> </span><span class="k">print</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="s">u'</span><span class="se">\u1234</span><span class="s">'</span><span class="p">)</span>
<span class="go">"\u1234"</span>
<span class="gp">>>> </span><span class="k">print</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="s">'</span><span class="se">\\</span><span class="s">'</span><span class="p">)</span>
<span class="go">"\\"</span>
<span class="gp">>>> </span><span class="k">print</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">({</span><span class="s">"c"</span><span class="p">:</span> <span class="mf">0</span><span class="p">,</span> <span class="s">"b"</span><span class="p">:</span> <span class="mf">0</span><span class="p">,</span> <span class="s">"a"</span><span class="p">:</span> <span class="mf">0</span><span class="p">},</span> <span class="n">sort_keys</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="go">{"a": 0, "b": 0, "c": 0}</span>
<span class="gp">>>> </span><span class="k">from</span> <span class="nn">StringIO</span> <span class="k">import</span> <span class="n">StringIO</span>
<span class="gp">>>> </span><span class="n">io</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">dump</span><span class="p">([</span><span class="s">'streaming API'</span><span class="p">],</span> <span class="n">io</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">io</span><span class="o">.</span><span class="n">getvalue</span><span class="p">()</span>
<span class="go">'["streaming API"]'</span>
</pre></div>
<p>Compact encoding:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">([</span><span class="mf">1</span><span class="p">,</span><span class="mf">2</span><span class="p">,</span><span class="mf">3</span><span class="p">,{</span><span class="s">'4'</span><span class="p">:</span> <span class="mf">5</span><span class="p">,</span> <span class="s">'6'</span><span class="p">:</span> <span class="mf">7</span><span class="p">}],</span> <span class="n">separators</span><span class="o">=</span><span class="p">(</span><span class="s">','</span><span class="p">,</span><span class="s">':'</span><span class="p">))</span>
<span class="go">'[1,2,3,{"4":5,"6":7}]'</span>
</pre></div>
<p>Pretty printing:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span>
<span class="gp">>>> </span><span class="n">s</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">({</span><span class="s">'4'</span><span class="p">:</span> <span class="mf">5</span><span class="p">,</span> <span class="s">'6'</span><span class="p">:</span> <span class="mf">7</span><span class="p">},</span> <span class="n">sort_keys</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">indent</span><span class="o">=</span><span class="mf">4</span> <span class="o">*</span> <span class="s">' '</span><span class="p">)</span>
<span class="gp">>>> </span><span class="k">print</span> <span class="s">'</span><span class="se">\n</span><span class="s">'</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="n">l</span><span class="o">.</span><span class="n">rstrip</span><span class="p">()</span> <span class="k">for</span> <span class="n">l</span> <span class="ow">in</span> <span class="n">s</span><span class="o">.</span><span class="n">splitlines</span><span class="p">()])</span>
<span class="go">{</span>
<span class="go"> "4": 5,</span>
<span class="go"> "6": 7</span>
<span class="go">}</span>
</pre></div>
<p>Decoding JSON:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span>
<span class="gp">>>> </span><span class="n">obj</span> <span class="o">=</span> <span class="p">[</span><span class="s">u'foo'</span><span class="p">,</span> <span class="p">{</span><span class="s">u'bar'</span><span class="p">:</span> <span class="p">[</span><span class="s">u'baz'</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">,</span> <span class="mf">2</span><span class="p">]}]</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">'["foo", {"bar":["baz", null, 1.0, 2]}]'</span><span class="p">)</span> <span class="o">==</span> <span class="n">obj</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">'"</span><span class="se">\\</span><span class="s">"foo</span><span class="se">\\</span><span class="s">bar"'</span><span class="p">)</span> <span class="o">==</span> <span class="s">u'"foo</span><span class="se">\x08</span><span class="s">ar'</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="k">from</span> <span class="nn">StringIO</span> <span class="k">import</span> <span class="n">StringIO</span>
<span class="gp">>>> </span><span class="n">io</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">(</span><span class="s">'["streaming API"]'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">io</span><span class="p">)[</span><span class="mf">0</span><span class="p">]</span> <span class="o">==</span> <span class="s">'streaming API'</span>
<span class="go">True</span>
</pre></div>
<p>Using Decimal instead of float:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span>
<span class="gp">>>> </span><span class="k">from</span> <span class="nn">decimal</span> <span class="k">import</span> <span class="n">Decimal</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">'1.1'</span><span class="p">,</span> <span class="n">use_decimal</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> <span class="o">==</span> <span class="n">Decimal</span><span class="p">(</span><span class="s">'1.1'</span><span class="p">)</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">Decimal</span><span class="p">(</span><span class="s">'1.1'</span><span class="p">),</span> <span class="n">use_decimal</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> <span class="o">==</span> <span class="s">'1.1'</span>
<span class="go">True</span>
</pre></div>
<p>Specializing JSON object decoding:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span>
<span class="gp">>>> </span><span class="k">def</span> <span class="nf">as_complex</span><span class="p">(</span><span class="n">dct</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">if</span> <span class="s">'__complex__'</span> <span class="ow">in</span> <span class="n">dct</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">return</span> <span class="nb">complex</span><span class="p">(</span><span class="n">dct</span><span class="p">[</span><span class="s">'real'</span><span class="p">],</span> <span class="n">dct</span><span class="p">[</span><span class="s">'imag'</span><span class="p">])</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">dct</span>
<span class="gp">...</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">'{"__complex__": true, "real": 1, "imag": 2}'</span><span class="p">,</span>
<span class="gp">... </span> <span class="n">object_hook</span><span class="o">=</span><span class="n">as_complex</span><span class="p">)</span>
<span class="go">(1+2j)</span>
<span class="gp">>>> </span><span class="k">import</span> <span class="nn">decimal</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">'1.1'</span><span class="p">,</span> <span class="n">parse_float</span><span class="o">=</span><span class="n">decimal</span><span class="o">.</span><span class="n">Decimal</span><span class="p">)</span> <span class="o">==</span> <span class="n">decimal</span><span class="o">.</span><span class="n">Decimal</span><span class="p">(</span><span class="s">'1.1'</span><span class="p">)</span>
<span class="go">True</span>
</pre></div>
<p>Specializing JSON object encoding:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span>
<span class="gp">>>> </span><span class="k">def</span> <span class="nf">encode_complex</span><span class="p">(</span><span class="n">obj</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="nb">complex</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="p">[</span><span class="n">obj</span><span class="o">.</span><span class="n">real</span><span class="p">,</span> <span class="n">obj</span><span class="o">.</span><span class="n">imag</span><span class="p">]</span>
<span class="gp">... </span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">o</span><span class="p">)</span> <span class="o">+</span> <span class="s">" is not JSON serializable"</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="mf">2</span> <span class="o">+</span> <span class="mf">1</span><span class="n">j</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="n">encode_complex</span><span class="p">)</span>
<span class="go">'[2.0, 1.0]'</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">JSONEncoder</span><span class="p">(</span><span class="n">default</span><span class="o">=</span><span class="n">encode_complex</span><span class="p">)</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="mf">2</span> <span class="o">+</span> <span class="mf">1</span><span class="n">j</span><span class="p">)</span>
<span class="go">'[2.0, 1.0]'</span>
<span class="gp">>>> </span><span class="s">''</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">json</span><span class="o">.</span><span class="n">JSONEncoder</span><span class="p">(</span><span class="n">default</span><span class="o">=</span><span class="n">encode_complex</span><span class="p">)</span><span class="o">.</span><span class="n">iterencode</span><span class="p">(</span><span class="mf">2</span> <span class="o">+</span> <span class="mf">1</span><span class="n">j</span><span class="p">))</span>
<span class="go">'[2.0, 1.0]'</span>
</pre></div>
<p>Using <tt class="xref docutils literal"><span class="pre">simplejson.tool</span></tt> from the shell to validate and pretty-print:</p>
<div class="highlight"><pre>$ echo '{"json":"obj"}' | python -m simplejson.tool
{
"json": "obj"
}
$ echo '{ 1.2:3.4}' | python -m simplejson.tool
Expecting property name: line 1 column 2 (char 2)
</pre></div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The JSON produced by this module’s default settings is a subset of
YAML, so it may be used as a serializer for that as well.</p>
</div>
<div class="section" id="basic-usage">
<h2 id="basic-usage">Basic Usage<a class="headerlink" href="#basic-usage" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="simplejson.dump">
<!--[simplejson.dump]--><tt class="descclassname">simplejson.</tt><tt class="descname">dump</tt><big>(</big><em>obj</em>, <em>fp</em><span class="optional">[</span>, <em>skipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><span class="optional">[</span>, <em>check_circular</em><span class="optional">[</span>, <em>allow_nan</em><span class="optional">[</span>, <em>cls</em><span class="optional">[</span>, <em>indent</em><span class="optional">[</span>, <em>separators</em><span class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>default</em><span class="optional">[</span>, <em>use_decimal</em><span class="optional">[</span>, <em>**kw</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.dump" title="Permalink to this definition">¶</a></dt>
<dd><p>Serialize <em>obj</em> as a JSON formatted stream to <em>fp</em> (a <tt class="docutils literal"><span class="pre">.write()</span></tt>-supporting
file-like object).</p>
<p>If <em>skipkeys</em> is true (default: <tt class="xref docutils literal"><span class="pre">False</span></tt>), then dict keys that are not
of a basic type (<tt class="xref docutils literal"><span class="pre">str</span></tt>, <tt class="xref docutils literal"><span class="pre">unicode</span></tt>, <tt class="xref docutils literal"><span class="pre">int</span></tt>, <tt class="xref docutils literal"><span class="pre">long</span></tt>,
<tt class="xref docutils literal"><span class="pre">float</span></tt>, <tt class="xref docutils literal"><span class="pre">bool</span></tt>, <tt class="xref docutils literal"><span class="pre">None</span></tt>) will be skipped instead of raising a
<tt class="xref docutils literal"><span class="pre">TypeError</span></tt>.</p>
<p>If <em>ensure_ascii</em> is false (default: <tt class="xref docutils literal"><span class="pre">True</span></tt>), then some chunks written
to <em>fp</em> may be <tt class="xref docutils literal"><span class="pre">unicode</span></tt> instances, subject to normal Python
<tt class="xref docutils literal"><span class="pre">str</span></tt> to <tt class="xref docutils literal"><span class="pre">unicode</span></tt> coercion rules. Unless <tt class="docutils literal"><span class="pre">fp.write()</span></tt>
explicitly understands <tt class="xref docutils literal"><span class="pre">unicode</span></tt> (as in <tt class="xref docutils literal"><span class="pre">codecs.getwriter()</span></tt>) this
is likely to cause an error. It’s best to leave the default settings, because
they are safe and it is highly optimized.</p>
<p>If <em>check_circular</em> is false (default: <tt class="xref docutils literal"><span class="pre">True</span></tt>), then the circular
reference check for container types will be skipped and a circular reference
will result in an <tt class="xref docutils literal"><span class="pre">OverflowError</span></tt> (or worse).</p>
<p>If <em>allow_nan</em> is false (default: <tt class="xref docutils literal"><span class="pre">True</span></tt>), then it will be a
<tt class="xref docutils literal"><span class="pre">ValueError</span></tt> to serialize out of range <tt class="xref docutils literal"><span class="pre">float</span></tt> values (<tt class="docutils literal"><span class="pre">nan</span></tt>,
<tt class="docutils literal"><span class="pre">inf</span></tt>, <tt class="docutils literal"><span class="pre">-inf</span></tt>) in strict compliance of the JSON specification.
If <em>allow_nan</em> is true, their JavaScript equivalents will be used
(<tt class="docutils literal"><span class="pre">NaN</span></tt>, <tt class="docutils literal"><span class="pre">Infinity</span></tt>, <tt class="docutils literal"><span class="pre">-Infinity</span></tt>).</p>
<p>If <em>indent</em> is a string, then JSON array elements and object members
will be pretty-printed with a newline followed by that string repeated
for each level of nesting. <tt class="xref docutils literal"><span class="pre">None</span></tt> (the default) selects the most compact
representation without any newlines. For backwards compatibility with
versions of simplejson earlier than 2.1.0, an integer is also accepted
and is converted to a string with that many spaces.</p>
<p>
<span class="versionmodified">Changed in version 2.1.0: </span>Changed <em>indent</em> from an integer number of spaces to a string.</p>
<p>If specified, <em>separators</em> should be an <tt class="docutils literal"><span class="pre">(item_separator,</span> <span class="pre">dict_separator)</span></tt>
tuple. By default, <tt class="docutils literal"><span class="pre">(',</span> <span class="pre">',</span> <span class="pre">':</span> <span class="pre">')</span></tt> are used. To get the most compact JSON
representation, you should specify <tt class="docutils literal"><span class="pre">(',',</span> <span class="pre">':')</span></tt> to eliminate whitespace.</p>
<p><em>encoding</em> is the character encoding for str instances, default is
<tt class="docutils literal"><span class="pre">'utf-8'</span></tt>.</p>
<p><em>default(obj)</em> is a function that should return a serializable version of
<em>obj</em> or raise <tt class="xref docutils literal"><span class="pre">TypeError</span></tt>. The default simply raises <tt class="xref docutils literal"><span class="pre">TypeError</span></tt>.</p>
<p>To use a custom <a title="simplejson.JSONEncoder" class="reference internal" href="#simplejson.JSONEncoder"><tt class="xref docutils literal"><span class="pre">JSONEncoder</span></tt></a> subclass (e.g. one that overrides the
<tt class="xref docutils literal"><span class="pre">default()</span></tt> method to serialize additional types), specify it with the
<em>cls</em> kwarg.</p>
<p>If <em>use_decimal</em> is true (default: <tt class="xref docutils literal"><span class="pre">False</span></tt>) then <tt class="xref docutils literal"><span class="pre">decimal.Decimal</span></tt>
will be natively serialized to JSON with full precision.</p>
<p>
<span class="versionmodified">Changed in version 2.1.0: </span><em>use_decimal</em> is new in 2.1.0.<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">JSON is not a framed protocol so unlike <tt class="xref docutils literal"><span class="pre">pickle</span></tt> or <tt class="xref docutils literal"><span class="pre">marshal</span></tt> it
does not make sense to serialize more than one JSON document without some
container protocol to delimit them.</p>
</div>
</p>
</dd></dl>
<dl class="function">
<dt id="simplejson.dumps">
<!--[simplejson.dumps]--><tt class="descclassname">simplejson.</tt><tt class="descname">dumps</tt><big>(</big><em>obj</em><span class="optional">[</span>, <em>skipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><span class="optional">[</span>, <em>check_circular</em><span class="optional">[</span>, <em>allow_nan</em><span class="optional">[</span>, <em>cls</em><span class="optional">[</span>, <em>indent</em><span class="optional">[</span>, <em>separators</em><span class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>default</em><span class="optional">[</span>, <em>use_decimal</em><span class="optional">[</span>, <em>**kw</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.dumps" title="Permalink to this definition">¶</a></dt>
<dd><p>Serialize <em>obj</em> to a JSON formatted <tt class="xref docutils literal"><span class="pre">str</span></tt>.</p>
<p>If <em>ensure_ascii</em> is false, then the return value will be a
<tt class="xref docutils literal"><span class="pre">unicode</span></tt> instance. The other arguments have the same meaning as in
<a title="simplejson.dump" class="reference internal" href="#simplejson.dump"><tt class="xref docutils literal"><span class="pre">dump()</span></tt></a>. Note that the default <em>ensure_ascii</em> setting has much
better performance.</p>
</dd></dl>
<dl class="function">
<dt id="simplejson.load">
<!--[simplejson.load]--><tt class="descclassname">simplejson.</tt><tt class="descname">load</tt><big>(</big><em>fp</em><span class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>cls</em><span class="optional">[</span>, <em>object_hook</em><span class="optional">[</span>, <em>parse_float</em><span class="optional">[</span>, <em>parse_int</em><span class="optional">[</span>, <em>parse_constant</em><span class="optional">[</span>, <em>object_pairs_hook</em><span class="optional">[</span>, <em>use_decimal</em><span class="optional">[</span>, <em>**kw</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.load" title="Permalink to this definition">¶</a></dt>
<dd><p>Deserialize <em>fp</em> (a <tt class="docutils literal"><span class="pre">.read()</span></tt>-supporting file-like object containing a JSON
document) to a Python object.</p>
<p>If the contents of <em>fp</em> are encoded with an ASCII based encoding other than
UTF-8 (e.g. latin-1), then an appropriate <em>encoding</em> name must be specified.
Encodings that are not ASCII based (such as UCS-2) are not allowed, and
should be wrapped with <tt class="docutils literal"><span class="pre">codecs.getreader(fp)(encoding)</span></tt>, or simply decoded
to a <tt class="xref docutils literal"><span class="pre">unicode</span></tt> object and passed to <a title="simplejson.loads" class="reference internal" href="#simplejson.loads"><tt class="xref docutils literal"><span class="pre">loads()</span></tt></a>. The default
setting of <tt class="docutils literal"><span class="pre">'utf-8'</span></tt> is fastest and should be using whenever possible.</p>
<p>If <em>fp.read()</em> returns <tt class="xref docutils literal"><span class="pre">str</span></tt> then decoded JSON strings that contain
only ASCII characters may be parsed as <tt class="xref docutils literal"><span class="pre">str</span></tt> for performance and
memory reasons. If your code expects only <tt class="xref docutils literal"><span class="pre">unicode</span></tt> the appropriate
solution is to wrap fp with a reader as demonstrated above.</p>
<p><em>object_hook</em> is an optional function that will be called with the result of
any object literal decode (a <tt class="xref docutils literal"><span class="pre">dict</span></tt>). The return value of
<em>object_hook</em> will be used instead of the <tt class="xref docutils literal"><span class="pre">dict</span></tt>. This feature can be used
to implement custom decoders (e.g. JSON-RPC class hinting).</p>
<p><em>object_pairs_hook</em> is an optional function that will be called with the
result of any object literal decode with an ordered list of pairs. The
return value of <em>object_pairs_hook</em> will be used instead of the
<tt class="xref docutils literal"><span class="pre">dict</span></tt>. This feature can be used to implement custom decoders that
rely on the order that the key and value pairs are decoded (for example,
<tt class="xref docutils literal"><span class="pre">collections.OrderedDict</span></tt> will remember the order of insertion). If
<em>object_hook</em> is also defined, the <em>object_pairs_hook</em> takes priority.</p>
<p>
<span class="versionmodified">Changed in version 2.1.0: </span>Added support for <em>object_pairs_hook</em>.</p>
<p><em>parse_float</em>, if specified, will be called with the string of every JSON
float to be decoded. By default, this is equivalent to <tt class="docutils literal"><span class="pre">float(num_str)</span></tt>.
This can be used to use another datatype or parser for JSON floats
(e.g. <tt class="xref docutils literal"><span class="pre">decimal.Decimal</span></tt>).</p>
<p><em>parse_int</em>, if specified, will be called with the string of every JSON int
to be decoded. By default, this is equivalent to <tt class="docutils literal"><span class="pre">int(num_str)</span></tt>. This can
be used to use another datatype or parser for JSON integers
(e.g. <tt class="xref docutils literal"><span class="pre">float</span></tt>).</p>
<p><em>parse_constant</em>, if specified, will be called with one of the following
strings: <tt class="docutils literal"><span class="pre">'-Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'NaN'</span></tt>. This can be used to
raise an exception if invalid JSON numbers are encountered.</p>
<p>If <em>use_decimal</em> is true (default: <tt class="xref docutils literal"><span class="pre">False</span></tt>) then <em>parse_float</em> is set to
<tt class="xref docutils literal"><span class="pre">decimal.Decimal</span></tt>. This is a convenience for parity with the
<a title="simplejson.dump" class="reference internal" href="#simplejson.dump"><tt class="xref docutils literal"><span class="pre">dump()</span></tt></a> parameter.</p>
<p>
<span class="versionmodified">Changed in version 2.1.0: </span><em>use_decimal</em> is new in 2.1.0.</p>
<p>To use a custom <a title="simplejson.JSONDecoder" class="reference internal" href="#simplejson.JSONDecoder"><tt class="xref docutils literal"><span class="pre">JSONDecoder</span></tt></a> subclass, specify it with the <tt class="docutils literal"><span class="pre">cls</span></tt>
kwarg. Additional keyword arguments will be passed to the constructor of the
class.</p>
<blockquote>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><a title="simplejson.load" class="reference internal" href="#simplejson.load"><tt class="xref docutils literal"><span class="pre">load()</span></tt></a> will read the rest of the file-like object as a string and
then call <a title="simplejson.loads" class="reference internal" href="#simplejson.loads"><tt class="xref docutils literal"><span class="pre">loads()</span></tt></a>. It does not stop at the end of the first valid
JSON document it finds and it will raise an error if there is anything
other than whitespace after the document. Except for files containing
only one JSON document, it is recommended to use <a title="simplejson.loads" class="reference internal" href="#simplejson.loads"><tt class="xref docutils literal"><span class="pre">loads()</span></tt></a>.</p>
</div>
</blockquote>
</dd></dl>
<dl class="function">
<dt id="simplejson.loads">
<!--[simplejson.loads]--><tt class="descclassname">simplejson.</tt><tt class="descname">loads</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>cls</em><span class="optional">[</span>, <em>object_hook</em><span class="optional">[</span>, <em>parse_float</em><span class="optional">[</span>, <em>parse_int</em><span class="optional">[</span>, <em>parse_constant</em><span class="optional">[</span>, <em>object_pairs_hook</em><span class="optional">[</span>, <em>use_decimal</em><span class="optional">[</span>, <em>**kw</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.loads" title="Permalink to this definition">¶</a></dt>
<dd><p>Deserialize <em>s</em> (a <tt class="xref docutils literal"><span class="pre">str</span></tt> or <tt class="xref docutils literal"><span class="pre">unicode</span></tt> instance containing a JSON
document) to a Python object.</p>
<p>If <em>s</em> is a <tt class="xref docutils literal"><span class="pre">str</span></tt> instance and is encoded with an ASCII based encoding
other than UTF-8 (e.g. latin-1), then an appropriate <em>encoding</em> name must be
specified. Encodings that are not ASCII based (such as UCS-2) are not
allowed and should be decoded to <tt class="xref docutils literal"><span class="pre">unicode</span></tt> first.</p>
<p>If <em>s</em> is a <tt class="xref docutils literal"><span class="pre">str</span></tt> then decoded JSON strings that contain
only ASCII characters may be parsed as <tt class="xref docutils literal"><span class="pre">str</span></tt> for performance and
memory reasons. If your code expects only <tt class="xref docutils literal"><span class="pre">unicode</span></tt> the appropriate
solution is decode <em>s</em> to <tt class="xref docutils literal"><span class="pre">unicode</span></tt> prior to calling loads.</p>
<p>The other arguments have the same meaning as in <a title="simplejson.load" class="reference internal" href="#simplejson.load"><tt class="xref docutils literal"><span class="pre">load()</span></tt></a>.</p>
</dd></dl>
</div>
<div class="section" id="encoders-and-decoders">
<h2 id="encoders-and-decoders">Encoders and decoders<a class="headerlink" href="#encoders-and-decoders" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="simplejson.JSONDecoder">
<!--[simplejson.JSONDecoder]-->class <tt class="descclassname">simplejson.</tt><tt class="descname">JSONDecoder</tt><big>(</big><span class="optional">[</span><em>encoding</em><span class="optional">[</span>, <em>object_hook</em><span class="optional">[</span>, <em>parse_float</em><span class="optional">[</span>, <em>parse_int</em><span class="optional">[</span>, <em>parse_constant</em><span class="optional">[</span>, <em>object_pairs_hook</em><span class="optional">[</span>, <em>strict</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.JSONDecoder" title="Permalink to this definition">¶</a></dt>
<dd><p>Simple JSON decoder.</p>
<p>Performs the following translations in decoding by default:</p>
<table border="1" class="docutils">
<colgroup>
<col width="44%" />
<col width="56%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">JSON</th>
<th class="head">Python</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>object</td>
<td>dict</td>
</tr>
<tr><td>array</td>
<td>list</td>
</tr>
<tr><td>string</td>
<td>unicode</td>
</tr>
<tr><td>number (int)</td>
<td>int, long</td>
</tr>
<tr><td>number (real)</td>
<td>float</td>
</tr>
<tr><td>true</td>
<td>True</td>
</tr>
<tr><td>false</td>
<td>False</td>
</tr>
<tr><td>null</td>
<td>None</td>
</tr>
</tbody>
</table>
<p>It also understands <tt class="docutils literal"><span class="pre">NaN</span></tt>, <tt class="docutils literal"><span class="pre">Infinity</span></tt>, and <tt class="docutils literal"><span class="pre">-Infinity</span></tt> as their
corresponding <tt class="docutils literal"><span class="pre">float</span></tt> values, which is outside the JSON spec.</p>
<p><em>encoding</em> determines the encoding used to interpret any <tt class="xref docutils literal"><span class="pre">str</span></tt> objects
decoded by this instance (<tt class="docutils literal"><span class="pre">'utf-8'</span></tt> by default). It has no effect when decoding
<tt class="xref docutils literal"><span class="pre">unicode</span></tt> objects.</p>
<p>Note that currently only encodings that are a superset of ASCII work, strings
of other encodings should be passed in as <tt class="xref docutils literal"><span class="pre">unicode</span></tt>.</p>
<p><em>object_hook</em> is an optional function that will be called with the result of
every JSON object decoded and its return value will be used in place of the
given <tt class="xref docutils literal"><span class="pre">dict</span></tt>. This can be used to provide custom deserializations
(e.g. to support JSON-RPC class hinting).</p>
<p><em>object_pairs_hook</em> is an optional function that will be called with the
result of any object literal decode with an ordered list of pairs. The
return value of <em>object_pairs_hook</em> will be used instead of the
<tt class="xref docutils literal"><span class="pre">dict</span></tt>. This feature can be used to implement custom decoders that
rely on the order that the key and value pairs are decoded (for example,
<tt class="xref docutils literal"><span class="pre">collections.OrderedDict</span></tt> will remember the order of insertion). If
<em>object_hook</em> is also defined, the <em>object_pairs_hook</em> takes priority.</p>
<p>
<span class="versionmodified">Changed in version 2.1.0: </span>Added support for <em>object_pairs_hook</em>.</p>
<p><em>parse_float</em>, if specified, will be called with the string of every JSON
float to be decoded. By default, this is equivalent to <tt class="docutils literal"><span class="pre">float(num_str)</span></tt>.
This can be used to use another datatype or parser for JSON floats
(e.g. <tt class="xref docutils literal"><span class="pre">decimal.Decimal</span></tt>).</p>
<p><em>parse_int</em>, if specified, will be called with the string of every JSON int
to be decoded. By default, this is equivalent to <tt class="docutils literal"><span class="pre">int(num_str)</span></tt>. This can
be used to use another datatype or parser for JSON integers
(e.g. <tt class="xref docutils literal"><span class="pre">float</span></tt>).</p>
<p><em>parse_constant</em>, if specified, will be called with one of the following
strings: <tt class="docutils literal"><span class="pre">'-Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'NaN'</span></tt>. This can be used to
raise an exception if invalid JSON numbers are encountered.</p>
<p><em>strict</em> controls the parser’s behavior when it encounters an invalid
control character in a string. The default setting of <tt class="xref docutils literal"><span class="pre">True</span></tt> means that
unescaped control characters are parse errors, if <tt class="xref docutils literal"><span class="pre">False</span></tt> then control
characters will be allowed in strings.</p>
<dl class="method">
<dt id="simplejson.JSONDecoder.decode">
<!--[simplejson.JSONDecoder.decode]--><tt class="descname">decode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#simplejson.JSONDecoder.decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the Python representation of <em>s</em> (a <tt class="xref docutils literal"><span class="pre">str</span></tt> or
<tt class="xref docutils literal"><span class="pre">unicode</span></tt> instance containing a JSON document)</p>
<p>If <em>s</em> is a <tt class="xref docutils literal"><span class="pre">str</span></tt> then decoded JSON strings that contain
only ASCII characters may be parsed as <tt class="xref docutils literal"><span class="pre">str</span></tt> for performance and
memory reasons. If your code expects only <tt class="xref docutils literal"><span class="pre">unicode</span></tt> the
appropriate solution is decode <em>s</em> to <tt class="xref docutils literal"><span class="pre">unicode</span></tt> prior to calling
decode.</p>
</dd></dl>
<dl class="method">
<dt id="simplejson.JSONDecoder.raw_decode">
<!--[simplejson.JSONDecoder.raw_decode]--><tt class="descname">raw_decode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#simplejson.JSONDecoder.raw_decode" title="Permalink to this definition">¶</a></dt>
<dd><p>Decode a JSON document from <em>s</em> (a <tt class="xref docutils literal"><span class="pre">str</span></tt> or <tt class="xref docutils literal"><span class="pre">unicode</span></tt>
beginning with a JSON document) and return a 2-tuple of the Python
representation and the index in <em>s</em> where the document ended.</p>
<p>This can be used to decode a JSON document from a string that may have
extraneous data at the end.</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="simplejson.JSONEncoder">
<!--[simplejson.JSONEncoder]-->class <tt class="descclassname">simplejson.</tt><tt class="descname">JSONEncoder</tt><big>(</big><span class="optional">[</span><em>skipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><span class="optional">[</span>, <em>check_circular</em><span class="optional">[</span>, <em>allow_nan</em><span class="optional">[</span>, <em>sort_keys</em><span class="optional">[</span>, <em>indent</em><span class="optional">[</span>, <em>separators</em><span class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>default</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder" title="Permalink to this definition">¶</a></dt>
<dd><p>Extensible JSON encoder for Python data structures.</p>
<p>Supports the following objects and types by default:</p>
<table border="1" class="docutils">
<colgroup>
<col width="56%" />
<col width="44%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">Python</th>
<th class="head">JSON</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>dict</td>
<td>object</td>
</tr>
<tr><td>list, tuple</td>
<td>array</td>
</tr>
<tr><td>str, unicode</td>
<td>string</td>
</tr>
<tr><td>int, long, float</td>
<td>number</td>
</tr>
<tr><td>True</td>
<td>true</td>
</tr>
<tr><td>False</td>
<td>false</td>
</tr>
<tr><td>None</td>
<td>null</td>
</tr>
</tbody>
</table>
<p>To extend this to recognize other objects, subclass and implement a
<a title="simplejson.JSONEncoder.default" class="reference internal" href="#simplejson.JSONEncoder.default"><tt class="xref docutils literal"><span class="pre">default()</span></tt></a> method with another method that returns a serializable object
for <tt class="docutils literal"><span class="pre">o</span></tt> if possible, otherwise it should call the superclass implementation
(to raise <tt class="xref docutils literal"><span class="pre">TypeError</span></tt>).</p>
<p>If <em>skipkeys</em> is false (the default), then it is a <tt class="xref docutils literal"><span class="pre">TypeError</span></tt> to
attempt encoding of keys that are not str, int, long, float or None. If
<em>skipkeys</em> is true, such items are simply skipped.</p>
<p>If <em>ensure_ascii</em> is true (the default), the output is guaranteed to be
<tt class="xref docutils literal"><span class="pre">str</span></tt> objects with all incoming unicode characters escaped. If
<em>ensure_ascii</em> is false, the output will be a unicode object.</p>
<p>If <em>check_circular</em> is false (the default), then lists, dicts, and custom
encoded objects will be checked for circular references during encoding to
prevent an infinite recursion (which would cause an <tt class="xref docutils literal"><span class="pre">OverflowError</span></tt>).
Otherwise, no such check takes place.</p>
<p>If <em>allow_nan</em> is true (the default), then <tt class="docutils literal"><span class="pre">NaN</span></tt>, <tt class="docutils literal"><span class="pre">Infinity</span></tt>, and
<tt class="docutils literal"><span class="pre">-Infinity</span></tt> will be encoded as such. This behavior is not JSON
specification compliant, but is consistent with most JavaScript based
encoders and decoders. Otherwise, it will be a <tt class="xref docutils literal"><span class="pre">ValueError</span></tt> to encode
such floats.</p>
<p>If <em>sort_keys</em> is true (not the default), then the output of dictionaries
will be sorted by key; this is useful for regression tests to ensure that
JSON serializations can be compared on a day-to-day basis.</p>
<p>If <em>indent</em> is a string, then JSON array elements and object members
will be pretty-printed with a newline followed by that string repeated
for each level of nesting. <tt class="xref docutils literal"><span class="pre">None</span></tt> (the default) selects the most compact
representation without any newlines. For backwards compatibility with
versions of simplejson earlier than 2.1.0, an integer is also accepted
and is converted to a string with that many spaces.</p>
<p>
<span class="versionmodified">Changed in version 2.1.0: </span>Changed <em>indent</em> from an integer number of spaces to a string.</p>
<p>If specified, <em>separators</em> should be an <tt class="docutils literal"><span class="pre">(item_separator,</span> <span class="pre">key_separator)</span></tt>
tuple. By default, <tt class="docutils literal"><span class="pre">(',</span> <span class="pre">',</span> <span class="pre">':</span> <span class="pre">')</span></tt> are used. To get the most compact JSON
representation, you should specify <tt class="docutils literal"><span class="pre">(',',</span> <span class="pre">':')</span></tt> to eliminate whitespace.</p>
<p>If specified, <em>default</em> should be a function that gets called for objects
that can’t otherwise be serialized. It should return a JSON encodable
version of the object or raise a <tt class="xref docutils literal"><span class="pre">TypeError</span></tt>.</p>
<p>If <em>encoding</em> is not <tt class="xref docutils literal"><span class="pre">None</span></tt>, then all input strings will be transformed
into unicode using that encoding prior to JSON-encoding. The default is
<tt class="docutils literal"><span class="pre">'utf-8'</span></tt>.</p>
<dl class="method">
<dt id="simplejson.JSONEncoder.default">
<!--[simplejson.JSONEncoder.default]--><tt class="descname">default</tt><big>(</big><em>o</em><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder.default" title="Permalink to this definition">¶</a></dt>
<dd><p>Implement this method in a subclass such that it returns a serializable
object for <em>o</em>, or calls the base implementation (to raise a
<tt class="xref docutils literal"><span class="pre">TypeError</span></tt>).</p>
<p>For example, to support arbitrary iterators, you could implement default
like this:</p>
<div class="highlight"><pre><span class="k">def</span> <span class="nf">default</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">o</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">iterable</span> <span class="o">=</span> <span class="nb">iter</span><span class="p">(</span><span class="n">o</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">TypeError</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="n">iterable</span><span class="p">)</span>
<span class="k">return</span> <span class="n">JSONEncoder</span><span class="o">.</span><span class="n">default</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">o</span><span class="p">)</span>
</pre></div>
</dd></dl>
<dl class="method">
<dt id="simplejson.JSONEncoder.encode">
<!--[simplejson.JSONEncoder.encode]--><tt class="descname">encode</tt><big>(</big><em>o</em><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder.encode" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a JSON string representation of a Python data structure, <em>o</em>. For
example:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span>
<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">JSONEncoder</span><span class="p">()</span><span class="o">.</span><span class="n">encode</span><span class="p">({</span><span class="s">"foo"</span><span class="p">:</span> <span class="p">[</span><span class="s">"bar"</span><span class="p">,</span> <span class="s">"baz"</span><span class="p">]})</span>
<span class="go">'{"foo": ["bar", "baz"]}'</span>
</pre></div>
</dd></dl>
<dl class="method">
<dt id="simplejson.JSONEncoder.iterencode">
<!--[simplejson.JSONEncoder.iterencode]--><tt class="descname">iterencode</tt><big>(</big><em>o</em><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder.iterencode" title="Permalink to this definition">¶</a></dt>
<dd><p>Encode the given object, <em>o</em>, and yield each string representation as
available. For example:</p>
<div class="highlight"><pre><span class="k">for</span> <span class="n">chunk</span> <span class="ow">in</span> <span class="n">JSONEncoder</span><span class="p">()</span><span class="o">.</span><span class="n">iterencode</span><span class="p">(</span><span class="n">bigobject</span><span class="p">):</span>
<span class="n">mysocket</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">chunk</span><span class="p">)</span>
</pre></div>
<p>Note that <a title="simplejson.JSONEncoder.encode" class="reference internal" href="#simplejson.JSONEncoder.encode"><tt class="xref docutils literal"><span class="pre">encode()</span></tt></a> has much better performance than
<a title="simplejson.JSONEncoder.iterencode" class="reference internal" href="#simplejson.JSONEncoder.iterencode"><tt class="xref docutils literal"><span class="pre">iterencode()</span></tt></a>.</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="simplejson.JSONEncoderForHTML">
<!--[simplejson.JSONEncoderForHTML]-->class <tt class="descclassname">simplejson.</tt><tt class="descname">JSONEncoderForHTML</tt><big>(</big><span class="optional">[</span><em>skipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><span class="optional">[</span>, <em>check_circular</em><span class="optional">[</span>, <em>allow_nan</em><span class="optional">[</span>, <em>sort_keys</em><span class="optional">[</span>, <em>indent</em><span class="optional">[</span>, <em>separators</em><span class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>default</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.JSONEncoderForHTML" title="Permalink to this definition">¶</a></dt>
<dd><p>Subclass of <a title="simplejson.JSONEncoder" class="reference internal" href="#simplejson.JSONEncoder"><tt class="xref docutils literal"><span class="pre">JSONEncoder</span></tt></a> that escapes &, <, and > for embedding in HTML.</p>
<p>
<span class="versionmodified">Changed in version 2.1.0: </span>New in 2.1.0</p>
</dd></dl>
</div>
</div>
</div>
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<li><a class="reference external" href=""><tt class="docutils literal"><span class="pre">simplejson</span></tt> — JSON encoder and decoder</a><ul>
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