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alert--warning margin-bottom--md" role=alert><div>This is unreleased documentation for <!-- -->Apache Fory™<!-- --> <b>dev</b> version.</div><div class=margin-top--md>For up-to-date documentation, see the <b><a href=/docs/guide/javascript/configuration>latest version</a></b> (<!-- -->1.3.0<!-- -->).</div></div><div class=docItemContainer_Djhp><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label=Breadcrumbs><ul class=breadcrumbs><li class=breadcrumbs__item><a aria-label="Home page" class=breadcrumbs__link href=/><svg viewBox="0 0 24 24" class=breadcrumbHomeIcon_YNFT><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill=currentColor /></svg></a><li class=breadcrumbs__item><span class=breadcrumbs__link>Guide</span><li class=breadcrumbs__item><a class=breadcrumbs__link href=/docs/next/guide/javascript/><span>JavaScript</span></a><li class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link>Configuration</span></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: dev</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Configuration</h1></header><p>Fory JavaScript is an xlang-only implementation. <code>new Fory()</code> writes xlang payloads and uses compatible
schema evolution by default. There is no native-mode switch in the JavaScript API.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=basic-configuration>Basic Configuration<a href=#basic-configuration class=hash-link aria-label="Direct link to Basic Configuration" title="Direct link to Basic Configuration" translate=no></a></h2>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> Fory </span><span class="token keyword" style=color:#00009f>from</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"@apache-fory/core"</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>const</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div>
<p>Create one <code>Fory</code> instance per application area and reuse it. Registration generates and caches
serializer code for each schema.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=constructor-options>Constructor Options<a href=#constructor-options class=hash-link aria-label="Direct link to Constructor Options" title="Direct link to Constructor Options" translate=no></a></h2>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> Fory </span><span class="token keyword" style=color:#00009f>from</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"@apache-fory/core"</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> hps </span><span class="token keyword" style=color:#00009f>from</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"@apache-fory/hps"</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>const</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> ref</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> compatible</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> maxDepth</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>100</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> maxGraphMemoryBytes</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>128</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>*</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>1024</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>*</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>1024</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> maxTypeFields</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>512</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> maxTypeMetaBytes</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>4096</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> maxSchemaVersionsPerType</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>10</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> maxAverageSchemaVersionsPerType</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>3</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> hps</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div>
<table><thead><tr><th>Option<th>Default<th>Description<tbody><tr><td><code>ref</code><td><code>false</code><td>Enable reference tracking for shared or circular object graphs<tr><td><code>compatible</code><td><code>true</code><td>Allow field additions/removals without breaking existing messages<tr><td><code>maxDepth</code><td><code>50</code><td>Maximum nesting depth. Must be <code>>= 2</code>. Increase for deeply nested structures<tr><td><code>maxGraphMemoryBytes</code><td><code>128 MiB</code><td>Approximate graph-memory gate accepted during one root deserialization<tr><td><code>maxTypeFields</code><td><code>512</code><td>Maximum fields accepted in one received remote struct metadata body<tr><td><code>maxTypeMetaBytes</code><td><code>4096</code><td>Maximum encoded body bytes accepted for one received TypeMeta body<tr><td><code>maxSchemaVersionsPerType</code><td><code>10</code><td>Maximum accepted remote metadata versions for one logical type<tr><td><code>maxAverageSchemaVersionsPerType</code><td><code>3</code><td>Average accepted remote metadata versions across accepted remote types<tr><td><code>useSliceString</code><td><code>false</code><td>Optional string-reading optimization for Node.js. Leave at default unless benchmarked<tr><td><code>hps</code><td>unset<td>Optional fast string helper from <code>@apache-fory/hps</code> (Node.js 20+)<tr><td><code>hooks.afterCodeGenerated</code><td>unset<td>Callback to inspect the generated serializer code, useful for debugging</table>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=reference-tracking>Reference Tracking<a href=#reference-tracking class=hash-link aria-label="Direct link to Reference Tracking" title="Direct link to Reference Tracking" translate=no></a></h2>
<p>Global reference tracking must be enabled before field-level reference metadata can take effect:</p>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>const</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"> ref</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token boolean" style=color:#36acaa>true</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div>
<p>Then mark reference-tracked fields in the schema, for example with
<code>Type.struct("example.node").setTrackingRef(true)</code>. See <a class="" href=/docs/next/guide/javascript/references>References</a> and
<a class="" href=/docs/next/guide/javascript/schema_metadata>Schema Metadata</a>.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=compatible-schema-evolution>Compatible Schema Evolution<a href=#compatible-schema-evolution class=hash-link aria-label="Direct link to Compatible Schema Evolution" title="Direct link to Compatible Schema Evolution" translate=no></a></h2>
<p>Compatible mode is the default. To use faster serialization and smaller size:</p>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>const</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"> compatible</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token boolean" style=color:#36acaa>false</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div>
<p>Use compatible mode for rolling upgrades, independently deployed services, and
cross-language payloads. Use <code>compatible: false</code> only when every reader and
writer always uses the same struct schema and you want faster serialization and
smaller size. For individual structs, <code>evolving: false</code> applies the same opt-out
to that struct. For cross-language payloads, set <code>compatible: false</code> only after
verifying that every language uses the same schema, or when native types are
generated from Fory schema IDL. See <a class="" href=/docs/next/guide/javascript/schema_evolution>Schema Evolution</a>.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=graph-memory-budget>Graph Memory Budget<a href=#graph-memory-budget class=hash-link aria-label="Direct link to Graph Memory Budget" title="Direct link to Graph Memory Budget" translate=no></a></h2>
<p><code>maxGraphMemoryBytes</code> sets an approximate graph-memory gate for one root deserialization. The
estimate mainly covers materialized arrays, sets, maps, structs, and objects. It skips leaf values
such as strings, binary data, primitive scalars, and dense primitive arrays, so actual JavaScript
heap use can be higher than this value. Leaf values remain protected by byte-availability checks: if
the unread input does not contain enough bytes, Fory will not read or create that leaf value. The
default is a fixed <code>128 MiB</code> and is not derived from input size.</p>
<p>Use a positive byte value to set an explicit lower or higher limit:</p>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>const</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> maxGraphMemoryBytes</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>32</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>*</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>1024</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>*</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>1024</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div>
<p>Explicit non-positive values are rejected when the runtime is created.</p>
<p>String, binary, and dedicated dense primitive array payloads keep their normal
byte-size checks and do not consume this graph budget. Raise the limit only for
trusted workloads that legitimately contain very compact object graphs.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=optional-hps-string-path>Optional HPS String Path<a href=#optional-hps-string-path class=hash-link aria-label="Direct link to Optional HPS String Path" title="Direct link to Optional HPS String Path" translate=no></a></h2>
<p><code>@apache-fory/hps</code> provides an optional Node.js string fast path:</p>
<div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-ts codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> hps </span><span class="token keyword" style=color:#00009f>from</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"@apache-fory/hps"</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>const</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"> hps </span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div>
<p>Leave this unset unless you run on Node.js 20+ and have benchmarked your workload.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=security>Security<a href=#security class=hash-link aria-label="Direct link to Security" title="Direct link to Security" translate=no></a></h2>
<p>Security-related configuration:</p>
<ul>
<li class="">Register only the expected schemas before deserializing untrusted payloads.</li>
<li class="">Set <code>maxDepth</code> for the maximum nesting depth your service accepts.</li>
<li class="">Set <code>maxGraphMemoryBytes</code> as an approximate gate for collection, map, array, struct, and
object-heavy payloads. It is not an exact heap cap; leaf values are gated by remaining input
bytes.</li>
<li class="">Keep <code>maxTypeFields</code> and <code>maxTypeMetaBytes</code> at their defaults unless the data
is not malicious and a trusted peer sends larger remote metadata.</li>
<li class="">Keep <code>maxSchemaVersionsPerType</code> and
<code>maxAverageSchemaVersionsPerType</code> at their defaults unless the data is not
malicious and a trusted peer sends many remote schema versions.</li>
<li class="">Prefer explicit <code>Type.struct(...)</code> schemas over <code>Type.any()</code> for untrusted input.</li>
<li class="">Pass <code>hps</code> only from the official package version you deploy with Fory.</li>
</ul>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=related-topics>Related Topics<a href=#related-topics class=hash-link aria-label="Direct link to Related Topics" title="Direct link to Related Topics" translate=no></a></h2>
<ul>
<li class=""><a class="" href=/docs/next/guide/javascript/basic_serialization>Basic Serialization</a></li>
<li class=""><a class="" href=/docs/next/guide/javascript/schema_metadata>Schema Metadata</a></li>
<li class=""><a class="" href=/docs/next/guide/javascript/schema_evolution>Schema Evolution</a></li>
<li class=""><a class="" href=/docs/next/guide/javascript/references>References</a></li>
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