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<div class="title">Schema </div> </div>
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<div class="contents">
<div class="textblock"><h2>Status: experimental, shall be included in v1.1</h2>
<p>JSON Schema is a draft standard for describing format of JSON. The schema itself is also a JSON. By validating a JSON with JSON Schema, your code can safely access the DOM without manually checking types, or whether a key exists, etc. It can also ensure that the serialized JSON conform to a specified schema.</p>
<p>RapidJSON implemented a JSON Schema validator for <a href="http://json-schema.org/documentation.html">JSON Schema Draft v4</a>. If you do not familiar with JSON Schema, you may refer to <a href="http://spacetelescope.github.io/understanding-json-schema/">Understanding JSON Schema</a>.</p>
<h2>Basic Usage</h2>
<p>First of all, you need to parse a JSON Schema into <code>Document</code>, and then compile the <code>Document</code> into <code>SchemaDocument</code>.</p>
<p>Secondly, construct a <code>SchemaValidator</code> with the <code>SchedmaDocument</code>. It is similar to a <code>Writer</code> in the sense of handling SAX events. So, you can use <code>document.Accept(validator)</code> to validate a document, and then check the validity.</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include "rapidjson/schema.h"</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// ...</span></div>
<div class="line"></div>
<div class="line"><a class="code" href="namespacerapidjson.html#a660c934c2959121babf799b6cb206659">Document</a> sd;</div>
<div class="line"><span class="keywordflow">if</span> (!sd.Parse(schemaJson)) {</div>
<div class="line"> <span class="comment">// the schema is not a valid JSON.</span></div>
<div class="line"> <span class="comment">// ... </span></div>
<div class="line">}</div>
<div class="line"><a class="code" href="namespacerapidjson.html#a1039ee639733008423fd0dfb67122e54">SchemaDocument</a> schema(sd); <span class="comment">// Compile a Document to SchemaDocument</span></div>
<div class="line"><span class="comment">// sd is no longer needed here.</span></div>
<div class="line"></div>
<div class="line"><a class="code" href="namespacerapidjson.html#a660c934c2959121babf799b6cb206659">Document</a> d;</div>
<div class="line"><span class="keywordflow">if</span> (!d.Parse(inputJson)) {</div>
<div class="line"> <span class="comment">// the input is not a valid JSON.</span></div>
<div class="line"> <span class="comment">// ... </span></div>
<div class="line">}</div>
<div class="line"></div>
<div class="line">SchemaValidator validator(schema);</div>
<div class="line"><span class="keywordflow">if</span> (!d.Accept(validator)) {</div>
<div class="line"> <span class="comment">// Input JSON is invalid according to the schema</span></div>
<div class="line"> <span class="comment">// Output diagnostic information</span></div>
<div class="line"> <a class="code" href="namespacerapidjson.html#a51a6c35028b76e354bbb9e25d7125641">StringBuffer</a> sb;</div>
<div class="line"> validator.GetInvalidSchemaPointer().StringifyUriFragment(sb);</div>
<div class="line"> printf(<span class="stringliteral">"Invalid schema: %s\n"</span>, sb.GetString());</div>
<div class="line"> printf(<span class="stringliteral">"Invalid keyword: %s\n"</span>, validator.GetInvalidSchemaKeyword());</div>
<div class="line"> sb.Clear();</div>
<div class="line"> validator.GetInvalidDocumentPointer().StringifyUriFragment(sb);</div>
<div class="line"> printf(<span class="stringliteral">"Invalid document: %s\n"</span>, sb.GetString());</div>
<div class="line">}</div>
</div><!-- fragment --><p>Some notes:</p>
<ul>
<li>One <code>SchemaDocment</code> can be referenced by multiple <code>SchemaValidator</code>s. It will not be modified by <code>SchemaValidator</code>s.</li>
<li>A <code>SchemaValidator</code> may be reused to validate multiple documents. To run it for other documents, call <code>validator.Reset()</code> first.</li>
</ul>
<h2>Validation during parsing/serialization</h2>
<p>Differ to most JSON Schema validator implementations, RapidJSON provides a SAX-based schema validator. Therefore, you can parse a JSON from a stream while validating it on the fly. If the validator encounters a JSON value that invalidates the supplied schema, the parsing will be terminated immediately. This design is especially useful for parsing large JSON files.</p>
<h3>DOM parsing</h3>
<p>For using DOM in parsing, <code>Document</code> needs some preparation and finalizing tasks, in addition to receiving SAX events, thus it needs some work to route the reader, validator and the document. <code>SchemaValidatingReader</code> is a helper class that doing such work.</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include "rapidjson/filereadstream.h"</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// ...</span></div>
<div class="line"><a class="code" href="namespacerapidjson.html#a1039ee639733008423fd0dfb67122e54">SchemaDocument</a> schema(sd); <span class="comment">// Compile a Document to SchemaDocument</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// Use reader to parse the JSON</span></div>
<div class="line">FILE* fp = fopen(<span class="stringliteral">"big.json"</span>, <span class="stringliteral">"r"</span>);</div>
<div class="line">FileReadStream is(fp, buffer, <span class="keyword">sizeof</span>(buffer));</div>
<div class="line"></div>
<div class="line"><span class="comment">// Parse JSON from reader, validate the SAX events, and store in d.</span></div>
<div class="line"><a class="code" href="namespacerapidjson.html#a660c934c2959121babf799b6cb206659">Document</a> d;</div>
<div class="line">SchemaValidatingReader<kParseDefaultFlags, FileReadStream, UTF8<> > reader(is, schema);</div>
<div class="line">d.Populate(reader);</div>
<div class="line"></div>
<div class="line"><span class="keywordflow">if</span> (!reader.GetParseResult()) {</div>
<div class="line"> <span class="comment">// Not a valid JSON</span></div>
<div class="line"> <span class="comment">// When reader.GetParseResult().Code() == kParseErrorTermination,</span></div>
<div class="line"> <span class="comment">// it may be terminated by:</span></div>
<div class="line"> <span class="comment">// (1) the validator found that the JSON is invalid according to schema; or</span></div>
<div class="line"> <span class="comment">// (2) the input stream has I/O error.</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">// Check the validation result</span></div>
<div class="line"> <span class="keywordflow">if</span> (!reader.IsValid()) {</div>
<div class="line"> <span class="comment">// Input JSON is invalid according to the schema</span></div>
<div class="line"> <span class="comment">// Output diagnostic information</span></div>
<div class="line"> <a class="code" href="namespacerapidjson.html#a51a6c35028b76e354bbb9e25d7125641">StringBuffer</a> sb;</div>
<div class="line"> reader.GetInvalidSchemaPointer().StringifyUriFragment(sb);</div>
<div class="line"> printf(<span class="stringliteral">"Invalid schema: %s\n"</span>, sb.GetString());</div>
<div class="line"> printf(<span class="stringliteral">"Invalid keyword: %s\n"</span>, reader.GetInvalidSchemaKeyword());</div>
<div class="line"> sb.Clear();</div>
<div class="line"> reader.GetInvalidDocumentPointer().StringifyUriFragment(sb);</div>
<div class="line"> printf(<span class="stringliteral">"Invalid document: %s\n"</span>, sb.GetString());</div>
<div class="line"> }</div>
<div class="line">}</div>
</div><!-- fragment --><h3>SAX parsing</h3>
<p>For using SAX in parsing, it is much simpler. If it only need to validate the JSON without further processing, it is simply:</p>
<div class="fragment"><div class="line">SchemaValidator validator(schema);</div>
<div class="line"><a class="code" href="namespacerapidjson.html#a4eaef42a208413d1f2c8d4655ecec52d">Reader</a> reader;</div>
<div class="line"><span class="keywordflow">if</span> (!reader.Parse(stream, validator)) {</div>
<div class="line"> <span class="keywordflow">if</span> (!validator.IsValid()) {</div>
<div class="line"> <span class="comment">// ... </span></div>
<div class="line"> }</div>
<div class="line">}</div>
</div><!-- fragment --><p>This is exactly the method used in <a href="example/schemavalidator/schemavalidator.cpp">schemavalidator</a> example. The distinct advantage is low memory usage, no matter how big the JSON was (the memory usage depends on the complexity of the schema).</p>
<p>If you need to handle the SAX events further, then you need to use the template class <code>GenericSchemaValidator</code> to set the output handler of the validator:</p>
<div class="fragment"><div class="line">MyHandler handler;</div>
<div class="line">GenericSchemaValidator<SchemaDocument, MyHandler> validator(schema, handler);</div>
<div class="line"><a class="code" href="namespacerapidjson.html#a4eaef42a208413d1f2c8d4655ecec52d">Reader</a> reader;</div>
<div class="line"><span class="keywordflow">if</span> (!reader.Parse(ss, validator)) {</div>
<div class="line"> <span class="keywordflow">if</span> (!validator.IsValid()) {</div>
<div class="line"> <span class="comment">// ... </span></div>
<div class="line"> }</div>
<div class="line">}</div>
</div><!-- fragment --><h3>Serialization</h3>
<p>It is also possible to do validation during serializing. This can ensure the result JSON is valid according to the JSON schema.</p>
<div class="fragment"><div class="line"><a class="code" href="namespacerapidjson.html#a51a6c35028b76e354bbb9e25d7125641">StringBuffer</a> sb;</div>
<div class="line">Writer<StringBuffer> writer(sb);</div>
<div class="line">GenericSchemaValidator<SchemaDocument, Writer<StringBuffer> > validator(s, writer);</div>
<div class="line"><span class="keywordflow">if</span> (!d.Accept(validator)) {</div>
<div class="line"> <span class="comment">// Some problem during Accept(), it may be validation or encoding issues.</span></div>
<div class="line"> <span class="keywordflow">if</span> (!validator.IsValid()) {</div>
<div class="line"> <span class="comment">// ...</span></div>
<div class="line"> }</div>
<div class="line">}</div>
</div><!-- fragment --><p>Of course, if your application only needs SAX-style serialization, it can simply send SAX events to <code>SchemaValidator</code> instead of <code>Writer</code>.</p>
<h2>Remote Schema</h2>
<p>JSON Schema supports <a href="http://spacetelescope.github.io/understanding-json-schema/structuring.html">`$ref` keyword</a>, which is a JSON pointer referencing to a local or remote schema. Local pointer is prefixed with <code>#</code>, while remote pointer is an relative or absolute URI. For example:</p>
<div class="fragment"><div class="line">{ <span class="stringliteral">"$ref"</span>: <span class="stringliteral">"definitions.json#/address"</span> }</div>
</div><!-- fragment --><p>As <code>SchemaValidator</code> does not know how to resolve such URI, it needs a user-provided <code>IRemoteSchemaDocumentProvider</code> instance to do so.</p>
<div class="fragment"><div class="line"><span class="keyword">class </span>MyRemoteSchemaDocumentProvider : <span class="keyword">public</span> <a class="code" href="namespacerapidjson.html#a735a06a6e822111798e302c2f3af3de9">IRemoteSchemaDocumentProvider</a> {</div>
<div class="line"><span class="keyword">public</span>:</div>
<div class="line"> <span class="keyword">virtual</span> <span class="keyword">const</span> <a class="code" href="namespacerapidjson.html#a1039ee639733008423fd0dfb67122e54">SchemaDocument</a>* GetRemoteDocument(<span class="keyword">const</span> <span class="keywordtype">char</span>* uri, SizeTyp length) {</div>
<div class="line"> <span class="comment">// Resolve the uri and returns a pointer to that schema.</span></div>
<div class="line"> }</div>
<div class="line">};</div>
<div class="line"></div>
<div class="line"><span class="comment">// ...</span></div>
<div class="line"></div>
<div class="line">MyRemoteSchemaDocumentProvider provider;</div>
<div class="line">SchemaValidator validator(schema, &provider);</div>
</div><!-- fragment --><h2>Conformance</h2>
<p>RapidJSON passed 262 out of 263 tests in <a href="https://github.com/json-schema/JSON-Schema-Test-Suite">JSON Schema Test Suite</a> (Json Schema draft 4).</p>
<p>The failed test is "changed scope ref invalid" of "change resolution scope" in <code>refRemote.json</code>. It is due to that <code>id</code> schema keyword and URI combining function are not implemented.</p>
<p>Besides, the <code>format</code> schema keyword for string values is ignored, since it is not required by the specification.</p>
<h3>Regular Expression</h3>
<p>The schema keyword <code>pattern</code> and <code>patternProperties</code> uses regular expression to match the required pattern.</p>
<p>RapidJSON implemented a simple NFA regular expression engine, which is used by default. It supports the following syntax.</p>
<table class="doxtable">
<tr>
<th>Syntax</th><th>Description </th></tr>
<tr>
<td><code>ab</code> </td><td>Concatenation </td></tr>
</table>
<p>|<code>a|b</code> | Alternation |<code>a?</code> | Zero or one |<code>a*</code> | Zero or more |<code>a+</code> | One or more |<code>a{3}</code> | Exactly 3 times |<code>a{3,}</code> | At least 3 times |<code>a{3,5}</code>| 3 to 5 times |<code>(ab)</code> | Grouping |<code>^a</code> | At the beginning |<code>a$</code> | At the end |<code>.</code> | Any character |<code>[abc]</code> | Character classes |<code>[a-c]</code> | Character class range |<code>[a-z0-9_]</code> | Character class combination |<code>[^abc]</code> | Negated character classes |<code>[^a-c]</code> | Negated character class range |<code>[\b]</code> | Backspace (U+0008) |<code>\|</code>, <code>\\</code>, ... | Escape characters |<code>\f</code> | Form feed (U+000C) |<code>\n</code> | Line feed (U+000A) |<code>\r</code> | Carriage return (U+000D) |<code>\t</code> | Tab (U+0009) |<code>\v</code> | Vertical tab (U+000B)</p>
<p>For C++11 compiler, it is also possible to use the <code>std::regex</code> by defining <code>RAPIDJSON_SCHEMA_USE_INTERNALREGEX=0</code> and <code>RAPIDJSON_SCHEMA_USE_STDREGEX=1</code>. If your schemas do not need <code>pattern</code> and <code>patternProperties</code>, you can set both macros to zero to disable this feature, which will reduce some code size.</p>
<h2>Performance</h2>
<p>Most C++ JSON libraries have not yet supporting JSON Schema. So we tried to evaluate the performance of RapidJSON's JSON Schema validator according to <a href="https://github.com/ebdrup/json-schema-benchmark">json-schema-benchmark</a>, which tests 11 JavaScript libraries running on Node.js.</p>
<p>That benchmark runs validations on <a href="https://github.com/json-schema/JSON-Schema-Test-Suite">JSON Schema Test Suite</a>, in which some test suites and tests are excluded. We made the same benchmarking procedure in <a href="test/perftest/schematest.cpp">`schematest.cpp`</a>.</p>
<p>On a Mac Book Pro (2.8 GHz Intel Core i7), the following results are collected.</p>
<table class="doxtable">
<tr>
<th>Validator</th><th align="center">Relative speed</th><th align="center">Number of test runs per second </th></tr>
<tr>
<td>RapidJSON</td><td align="center">36521%</td><td align="center">7220217 </td></tr>
<tr>
<td><a href="https://github.com/epoberezkin/ajv">`ajv`</a></td><td align="center">100%</td><td align="center">19770 (± 1.31%) </td></tr>
<tr>
<td><a href="https://github.com/mafintosh/is-my-json-valid">`is-my-json-valid`</a></td><td align="center">70%</td><td align="center">13835 (± 2.84%) </td></tr>
<tr>
<td><a href="https://github.com/bugventure/jsen">`jsen`</a></td><td align="center">57.7%</td><td align="center">11411 (± 1.27%) </td></tr>
<tr>
<td><a href="https://github.com/AlexeyGrishin/schemasaurus">`schemasaurus`</a></td><td align="center">26%</td><td align="center">5145 (± 1.62%) </td></tr>
<tr>
<td><a href="https://github.com/playlyfe/themis">`themis`</a></td><td align="center">19.9%</td><td align="center">3935 (± 2.69%) </td></tr>
<tr>
<td><a href="https://github.com/zaggino/z-schema">`z-schema`</a></td><td align="center">7%</td><td align="center">1388 (± 0.84%) </td></tr>
<tr>
<td><a href="https://github.com/pandastrike/jsck#readme">`jsck`</a></td><td align="center">3.1%</td><td align="center">606 (± 2.84%) </td></tr>
<tr>
<td><a href="https://github.com/tdegrunt/jsonschema#readme">`jsonschema`</a></td><td align="center">0.9%</td><td align="center">185 (± 1.01%) </td></tr>
<tr>
<td><a href="https://github.com/Prestaul/skeemas#readme">`skeemas`</a></td><td align="center">0.8%</td><td align="center">154 (± 0.79%) </td></tr>
<tr>
<td>tv4</td><td align="center">0.5%</td><td align="center">93 (± 0.94%) </td></tr>
<tr>
<td><a href="https://github.com/natesilva/jayschema">`jayschema`</a></td><td align="center">0.1%</td><td align="center">21 (± 1.14%) </td></tr>
</table>
<p>That is, RapidJSON is about ~365 times faster than the fastest JavaScript library (ajv). And ~344 thousand times faster than the slowest one. </p>
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