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title="Cross Language" class=categoryLinkLabel_W154>Cross Language</span></a><button aria-label="Expand sidebar category 'Cross Language'" aria-expanded=false type=button class="clean-btn menu__caret"></button></div></ul></ul></nav></div></div></aside><main class=docMainContainer_TBSr><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_VOVn"><div class="theme-doc-version-banner alert 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/dart/code_generation>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/dart/><span>Dart</span></a><li class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link>Code Generation</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>Code Generation</h1></header><p>Fory generates fast serializer code for your Dart classes at build time. You annotate your models, run <code>build_runner</code>, and Fory takes care of the rest.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-1--annotate-your-models>Step 1 — Annotate Your Models<a href=#step-1--annotate-your-models class=hash-link aria-label="Direct link to Step 1 — Annotate Your Models" title="Direct link to Step 1 — Annotate Your Models" translate=no></a></h2>
<p>Add <code>@ForyStruct()</code> to each class you want to serialize. Include the generated part directive at the top of the file.</p>
<div class="language-dart codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-dart 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"> </span><span class="token string-literal string" style=color:#e3116c>'package:fory/fory.dart'</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>part</span><span class="token plain"> </span><span class="token string-literal string" style=color:#e3116c>'models.fory.dart'</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 metadata function" style=color:#d73a49>@ForyStruct</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"></span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">Address</span><span class="token plain"> </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 class-name">Address</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><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 class-name">String</span><span class="token plain"> city </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token string-literal string" style=color:#e3116c>''</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 class-name">String</span><span class="token plain"> street </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token string-literal string" style=color:#e3116c>''</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 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 metadata function" style=color:#d73a49>@ForyStruct</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"></span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">User</span><span class="token plain"> </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 class-name">User</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><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 class-name">String</span><span class="token plain"> name </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token string-literal string" style=color:#e3116c>''</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 metadata function" style=color:#d73a49>@ForyField</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">type</span><span class="token punctuation" style=color:#393A34>:</span><span class="token plain"> </span><span class="token class-name">Int32Type</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><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> int age </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>0</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 class-name">Address</span><span class="token plain"> address </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">Address</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><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><br/></div></code></pre></div></div>
<p>Enums defined in the same file are automatically included in the generated registration.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-2--run-the-generator>Step 2 — Run the Generator<a href=#step-2--run-the-generator class=hash-link aria-label="Direct link to Step 2 — Run the Generator" title="Direct link to Step 2 — Run the Generator" translate=no></a></h2>
<p>From the directory that contains your <code>pubspec.yaml</code>:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token plain">dart run build_runner build --delete-conflicting-outputs</span><br/></div></code></pre></div></div>
<p>This emits a <code>.fory.dart</code> file next to your source file. Re-run this command any time you add or rename annotated types.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-3--register-and-use>Step 3 — Register and Use<a href=#step-3--register-and-use class=hash-link aria-label="Direct link to Step 3 — Register and Use" title="Direct link to Step 3 — Register and Use" translate=no></a></h2>
<p>The generator creates a Fory module class (named after your file) with a <code>register</code> function. Call it before serializing:</p>
<div class="language-dart codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-dart 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>final</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</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><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token class-name">ModelsForyModule</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>register</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">fory</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token class-name">Address</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> id</span><span class="token punctuation" style=color:#393A34>:</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>1</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"></span><span class="token class-name">ModelsForyModule</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>register</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">fory</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token class-name">User</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> id</span><span class="token punctuation" style=color:#393A34>:</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>2</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div>
<p>Or use a stable name instead of a numeric ID (useful for cross-language scenarios):</p>
<div class="language-dart codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-dart codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token class-name">ModelsForyModule</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>register</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"> fory</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 class-name">User</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"> name</span><span class="token punctuation" style=color:#393A34>:</span><span class="token plain"> </span><span class="token string-literal string" style=color:#e3116c>'example.User'</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><br/></div></code></pre></div></div>
<p>See <a class="" href=/docs/next/guide/dart/type_registration>Type Registration</a> for guidance on choosing between IDs and names.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=schema-evolution-evolving>Schema Evolution: <code>evolving</code><a href=#schema-evolution-evolving class=hash-link aria-label="Direct link to schema-evolution-evolving" title="Direct link to schema-evolution-evolving" translate=no></a></h2>
<p><code>@ForyStruct()</code> defaults to <code>evolving: true</code>, which is the right choice for most applications.</p>
<ul>
<li class=""><code>evolving: true</code> — Fory stores enough metadata so that if you add or remove fields later, old and new code can still exchange messages. Enable this whenever different versions of your app or service may be running at the same time.</li>
<li class=""><code>evolving: false</code> — Faster serialization and smaller size. Use only when every reader and writer always uses the same struct schema.</li>
</ul>
<div class="language-dart codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-dart codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// evolving: true is the default, you can omit it</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token metadata function" style=color:#d73a49>@ForyStruct</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">evolving</span><span class="token punctuation" 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"></span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> </span><span class="token class-name">Event</span><span class="token plain"> </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 class-name">Event</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><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 class-name">String</span><span class="token plain"> name </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token string-literal string" style=color:#e3116c>''</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><br/></div></code></pre></div></div>
<p>When using evolving structs, also assign stable field IDs with <code>@ForyField(id: ...)</code> before you ship your first payload — those IDs are how Fory matches fields after a schema change.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=when-not-to-use-code-generation>When Not to Use Code Generation<a href=#when-not-to-use-code-generation class=hash-link aria-label="Direct link to When Not to Use Code Generation" title="Direct link to When Not to Use Code Generation" translate=no></a></h2>
<p>If you cannot annotate a type (e.g., it comes from a package you do not own), write a <a class="" href=/docs/next/guide/dart/custom_serializers>Custom Serializer</a> instead.</p>
<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/dart/type_registration>Type Registration</a></li>
<li class=""><a class="" href=/docs/next/guide/dart/schema_metadata>Schema Metadata</a></li>
<li class=""><a class="" href=/docs/next/guide/dart/schema_evolution>Schema Evolution</a></li>
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