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class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/roadmap">Roadmap</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" tabindex="0" href="/docs/swagger-codegen-migration">Migrating from Swagger Codegen</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/fork-qna">Swagger Codegen Fork: Q&A</a></li></ul></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/docs/release-summary">Releases</a></div></li><li class="theme-doc-sidebar-item-category 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fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">About</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Migrating from Swagger Codegen</span><meta itemprop="position" content="2"></li></ul></nav><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>Migrating from Swagger Codegen</h1></header><p>OpenAPI Generator is a fork of <code>swagger-codegen</code> between version <code>2.3.1</code> and <code>2.4.0</code>. For the reasons behind the fork, please refer to the <a href="https://github.com/OpenAPITools/openapi-generator/blob/master/docs/qna.md" target="_blank" rel="noopener noreferrer">Q&A</a>.
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This community-driven version called "OpenAPI Generator" provides similar functionalities and can be used as drop-in replacement.
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This guide explains the major differences in order to help you with the migration.</p><p><strong>Table of contents</strong></p><ul><li><a href="#new-docker-images">New docker images</a></li><li><a href="#new-maven-coordinates">New maven coordinates</a></li><li><a href="#changes-in-maven-plugin">Changes in Maven Plugin</a></li><li><a href="#new-generators-names">New generators names</a></li><li><a href="#new-parameters-name">New parameters name</a></li><li><a href="#renamed-mustache-template-variables">Renamed Mustache Template Variables</a></li><li><a href="#ignore-file">Ignore file</a></li><li><a href="#metadata-folder">metadata-folder</a></li><li><a href="#new-default-values-for-the-generated-code">New default values for the generated code</a></li><li><a href="#new-fully-qualified-name-for-the-classes">New fully qualified name for the classes</a></li><li><a href="#body-parameter-name">Body parameter name</a></li><li><a href="#default-basepath">Default basePath</a></li><li><a href="#nullable">Nullable</a></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="new-docker-images">New docker images<a href="#new-docker-images" class="hash-link" aria-label="Direct link to New docker images" title="Direct link to New docker images"></a></h2><p>The docker images are available on DockerHub: <a href="https://hub.docker.com/u/openapitools/" target="_blank" rel="noopener noreferrer">https://hub.docker.com/u/openapitools/</a></p><p><strong>CLI for OpenAPI Generator</strong></p><p>Image to run OpenAPI Generator in the command line (see <a href="https://github.com/OpenAPITools/openapi-generator/blob/master/README.md#openapi-generator-cli-docker-image" target="_blank" rel="noopener noreferrer">OpenAPI Generator CLI Docker Image</a>)</p><p>Old: <code>swaggerapi/swagger-codegen-cli</code></p><p>New: <code>openapitools/openapi-generator-cli</code></p><p><strong>OpenAPI Generator as web service</strong></p><p>Image to run OpenAPI Generator as a web service (see <a href="https://github.com/OpenAPITools/openapi-generator/blob/master/README.md#openapi-generator-online-docker-image" target="_blank" rel="noopener noreferrer">OpenAPI Generator Online Docker Image</a>)</p><p>Old: <code>swaggerapi/swagger-generator</code></p><p>New: <code>openapitools/openapi-generator-online</code></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="new-maven-coordinates">New maven coordinates<a href="#new-maven-coordinates" class="hash-link" aria-label="Direct link to New maven coordinates" title="Direct link to New maven coordinates"></a></h2><p>You can find our released artefact on maven central:</p><p><strong>Core:</strong></p><p>Old:</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">io.swagger</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">swagger-codegen</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>New:</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">org.openapitools</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">openapi-generator</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong>Cli:</strong></p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">io.swagger</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">swagger-codegen-cli</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>New:</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">org.openapitools</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">openapi-generator-cli</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong>Maven plugin:</strong></p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">io.swagger</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">swagger-codegen-maven-plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>New:</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">org.openapitools</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain">openapi-generator-maven-plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token tag punctuation" style="color:rgb(248, 248, 242)"></</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="changes-in-maven-plugin">Changes in Maven Plugin<a href="#changes-in-maven-plugin" class="hash-link" aria-label="Direct link to Changes in Maven Plugin" title="Direct link to Changes in Maven Plugin"></a></h2><p>OpenAPI Generator 3.0.0 has introduced <code><generatorName></code> and deprecated <code><language></code>, because this refers to generator names which embed more than just "language".</p><p>If both options are present, you'll be presented with an error. If only <code><language></code> is provided, you'll be presented instructions for updating to the new config.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="new-generators-names">New generators names<a href="#new-generators-names" class="hash-link" aria-label="Direct link to New generators names" title="Direct link to New generators names"></a></h2><p>When you run OpenAPI Generator, you need to select a target generator (<code>-g</code> option in the cli).
|
||
All languages of <code>swagger-codegen</code> have been migrated to <code>openapi-generator</code>, but some names were changed, in order to be more consistent.</p><table><thead><tr><th>name in <code>swagger-codegen</code></th><th>name in <code>openapi-generator</code></th></tr></thead><tbody><tr><td><code>akka-scala</code></td><td><code>scala-akka</code></td></tr><tr><td><code>scala</code></td><td><code>scala-httpclient</code></td></tr><tr><td><code>jaxrs</code></td><td><code>jaxrs-jersey</code></td></tr><tr><td><code>qt5cpp</code></td><td><code>cpp-qt5</code></td></tr><tr><td><code>cpprest</code></td><td><code>cpp-restsdk</code></td></tr><tr><td><code>tizen</code></td><td><code>cpp-tizen</code></td></tr><tr><td><code>sinatra</code></td><td><code>ruby-sinatra</code></td></tr><tr><td><code>swift</code></td><td><code>swift2-deprecated</code></td></tr><tr><td><code>lumen</code></td><td><code>php-lumen</code></td></tr><tr><td><code>slim</code></td><td><code>php-slim</code></td></tr><tr><td><code>ze-ph</code></td><td><code>php-mezzio-ph</code></td></tr></tbody></table><p>We provide a temporary mapping in code for these old values. You'll receive a warning with instructions to migrate to the new names.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="new-parameters-name">New parameters name<a href="#new-parameters-name" class="hash-link" aria-label="Direct link to New parameters name" title="Direct link to New parameters name"></a></h2><p>Some parameters were renamed.
|
||
Often you need to replace "Swagger", with "OpenAPI".
|
||
Some examples:</p><table><thead><tr><th>name in <code>swagger-codegen</code></th><th>name in <code>openapi-generator</code></th></tr></thead><tbody><tr><td><code>debugSwagger</code></td><td><code>debugOpenAPI</code></td></tr><tr><td><code>GenerateSwaggerMetadata</code></td><td><code>GenerateOpenAPIMetadata</code></td></tr><tr><td><code>swagger.codegen.undertow.apipackage</code></td><td><code>openapi.codegen.undertow.apipackage</code></td></tr><tr><td><code>swagger.codegen.undertow.modelpackage</code></td><td><code>openapi.codegen.undertow.modelpackage</code></td></tr></tbody></table><h2 class="anchor anchorWithStickyNavbar_LWe7" id="renamed-mustache-template-variables">Renamed Mustache Template Variables<a href="#renamed-mustache-template-variables" class="hash-link" aria-label="Direct link to Renamed Mustache Template Variables" title="Direct link to Renamed Mustache Template Variables"></a></h2><p>The template variable <code>{{datatype}}</code> was renamed to <code>{{dataType}}</code> for consistency reason.
|
||
Corresponding java code: <code>CodegenProperty.datatype</code> is renamed to <code>CodegenProperty.dataType</code>.</p><p>(If you're <strong>not</strong> using customized templates with the <code>-t</code> option, you can ignore the mustache variable renaming above.)</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="ignore-file">Ignore file<a href="#ignore-file" class="hash-link" aria-label="Direct link to Ignore file" title="Direct link to Ignore file"></a></h2><p><code>.swagger-codegen-ignore</code> is replaced by <code>.openapi-generator-ignore</code>.
|
||
The syntax inside the file stays the same.</p><p>You don't need to rename the file manually, OpenAPI Generator will do it when your run it against an existing output directory.
|
||
(When there is no <code>.openapi-generator-ignore</code> in a folder, if a <code>.swagger-codegen-ignore</code> file is present it will be considered and renamed to <code>.openapi-generator-ignore</code>).</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="metadata-folder">Metadata folder<a href="#metadata-folder" class="hash-link" aria-label="Direct link to Metadata folder" title="Direct link to Metadata folder"></a></h2><p>The metadata folder (to store the <code>VERSION</code> file for example) is now called <code>.openapi-generator/</code> instead of <code>.swagger-codegen/</code>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="new-default-values-for-the-generated-code">New default values for the generated code<a href="#new-default-values-for-the-generated-code" class="hash-link" aria-label="Direct link to New default values for the generated code" title="Direct link to New default values for the generated code"></a></h2><p>If you use a generator without specifying each parameter, you might see some differences in the generated code.
|
||
As example the default package name used in the generated code has changed.
|
||
You need to have a look at the specific value, depending on your target language, but often <code>Swagger</code> îs replaced by <code>OpenAPITools</code> and <code>io.swagger</code> is replaced by <code>org.openapitools</code>.
|
||
Concretely if you did not specify anything when you are generating java code, a file <code>org/openapitools/api/PetApi.java</code> might be generated instead of <code>io/swagger/api/PetApi.java</code>.</p><p>If this is a problem for you, you need to explicitly set the parameter value in order to match with the <code>swagger-codegen</code> default value (<code>apiPackage</code> == <code>io.swagger</code> in the previous example with the java generator).</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="new-fully-qualified-name-for-the-classes">New fully qualified name for the classes<a href="#new-fully-qualified-name-for-the-classes" class="hash-link" aria-label="Direct link to New fully qualified name for the classes" title="Direct link to New fully qualified name for the classes"></a></h2><p>If you have extended some generators in your project, and you are looking for a specific class, replace the <code>io.swagger.codegen</code> package (old name) with <code>org.openapitools.codegen</code> package (new name).</p><p>Example: <code>org.openapitools.codegen.DefaultGenerator</code></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="body-parameter-name">Body parameter name<a href="#body-parameter-name" class="hash-link" aria-label="Direct link to Body parameter name" title="Direct link to Body parameter name"></a></h2><p>‼️ Since 4.0.0-beta, the body parameter name in OAS v2 is automatically preserved in the vendor extension <code>x-codegen-request-body-name</code></p><p>In OpenAPI spec v3, there's no body parameter, which is replaced by <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.1.md#request-body-object" target="_blank" rel="noopener noreferrer">Request Body Object</a>. The parameter name for Request Body is named automatically based on the model name (e.g. User). To control how the "Request Body" parameter is named, please add the vendor extension <code>x-codegen-request-body-name</code> to the operation:</p><p>OpenAPI Spec v3:</p><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token key atrule">paths</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">/pet</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">post</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">tags</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> pet</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">summary</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> Add a new pet to the store</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">description</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">''</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">operationId</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> addPet</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">x-codegen-request-body-name</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> new_body_name</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">responses</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">'405'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">description</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> Invalid input</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">security</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token key atrule">petstore_auth</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'write:pets'</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'read:pets'</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">requestBody</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">$ref</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'#/components/requestBodies/Pet'</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>OpenAPI Spec v2:</p><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token key atrule">paths</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">/pet</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">post</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">tags</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> pet</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">summary</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> Add a new pet to the store</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">description</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">''</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">operationId</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> addPet</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">x-codegen-request-body-name</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> new_body_name</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">consumes</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> application/json</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> application/xml</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">produces</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> application/xml</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> application/json</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">parameters</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token key atrule">in</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> body</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">name</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> body</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">description</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> Pet object that needs to be added to the store</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">required</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token boolean important">true</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">schema</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">$ref</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'#/definitions/Pet'</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">responses</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">'405'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">description</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> Invalid input</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">security</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token key atrule">petstore_auth</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'write:pets'</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'read:pets'</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>If your API client is using named parameters in the function call (e.g. Perl required & optional parameters, Ruby optional parameters), you will need to add <code>x-codegen-request-body-name</code> to the spec to restore the original body parameter name.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="default-basepath">Default basePath<a href="#default-basepath" class="hash-link" aria-label="Direct link to Default basePath" title="Direct link to Default basePath"></a></h2><p>The default <code>basePath</code> has been changed from <code>https://localhost</code> to <code>http://localhost</code> (http without s)</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="nullable">Nullable<a href="#nullable" class="hash-link" aria-label="Direct link to Nullable" title="Direct link to Nullable"></a></h2><p>OpenAPI spec v3 has better support for <code>nullable</code>. If you're still using OpenAPI/Swagger spec v2, please use <code>x-nullable: true</code> instead.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/OpenAPITools/openapi-generator/edit/master/website/../docs/migration-from-swagger-codegen.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2022-11-07T13:30:24.000Z">Nov 7, 2022</time></b> by <b>Nathan Baulch</b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs 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