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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&amp;A</a>.
This community-driven version called &quot;OpenAPI Generator&quot; provides similar functionalities and can be used as drop-in replacement.
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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">io.swagger</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">swagger-codegen</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">org.openapitools</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">openapi-generator</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">io.swagger</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">swagger-codegen-cli</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">org.openapitools</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">openapi-generator-cli</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">io.swagger</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">swagger-codegen-maven-plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">org.openapitools</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">groupId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</span><span class="token plain">openapi-generator-maven-plugin</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">artifactId</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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)">&lt;/</span><span class="token tag" style="color:rgb(255, 121, 198)">dependency</span><span class="token tag punctuation" style="color:rgb(248, 248, 242)">&gt;</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>&lt;generatorName&gt;</code> and deprecated <code>&lt;language&gt;</code>, because this refers to generator names which embed more than just &quot;language&quot;.</p><p>If both options are present, you&#x27;ll be presented with an error. If only <code>&lt;language&gt;</code> is provided, you&#x27;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&#x27;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 &quot;Swagger&quot;, with &quot;OpenAPI&quot;.
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&#x27;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&#x27;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&#x27;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 &quot;Request Body&quot; 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)">&#x27;&#x27;</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">&#x27;405&#x27;</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)">&#x27;write:pets&#x27;</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)">&#x27;read:pets&#x27;</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)">&#x27;#/components/requestBodies/Pet&#x27;</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)">&#x27;&#x27;</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)">&#x27;#/definitions/Pet&#x27;</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">&#x27;405&#x27;</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)">&#x27;write:pets&#x27;</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)">&#x27;read:pets&#x27;</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 &amp; 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&#x27;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" 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