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<span class="sidebar-ad-text">Get started in minutes</span>
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</li></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_z5aJ"><div class="docItemContainer_c0TR"><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" aria-hidden="true" focusable="false" role="presentation" class="breadcrumbHomeIcon_xK9p"><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"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Develop</span></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Bundle extensions</span></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Langflow Extension quickstart</span></li></ul></nav><div class="docMetaRow_c2hx"><div class="root_Eutc"><button type="button" class="button_gpNY"><span aria-hidden="true" class="icon_Bm9L"><svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-copy"><rect width="14" height="14" x="8" y="8" rx="2" ry="2"></rect><path d="M4 16c-1.1 0-2-.9-2-2V4c0-1.1.9-2 2-2h10c1.1 0 2 .9 2 2"></path></svg></span><span class="label_LzDG">Copy page</span></button></div><span class="theme-doc-version-badge badge badge--secondary">Version: 1.10.x</span></div><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>Langflow Extension quickstart</h1></header><style>[data-ch-theme="github-dark"] { --ch-t-colorScheme: dark;--ch-t-foreground: #c9d1d9;--ch-t-background: #0d1117;--ch-t-lighter-inlineBackground: #0d1117e6;--ch-t-editor-background: #0d1117;--ch-t-editor-foreground: #c9d1d9;--ch-t-editor-lineHighlightBackground: #6e76811a;--ch-t-editor-rangeHighlightBackground: #ffffff0b;--ch-t-editor-infoForeground: #3794FF;--ch-t-editor-selectionBackground: #264F78;--ch-t-focusBorder: #1f6feb;--ch-t-tab-activeBackground: #0d1117;--ch-t-tab-activeForeground: #c9d1d9;--ch-t-tab-inactiveBackground: #010409;--ch-t-tab-inactiveForeground: #8b949e;--ch-t-tab-border: #30363d;--ch-t-tab-activeBorder: #0d1117;--ch-t-editorGroup-border: #30363d;--ch-t-editorGroupHeader-tabsBackground: #010409;--ch-t-editorLineNumber-foreground: #6e7681;--ch-t-input-background: #0d1117;--ch-t-input-foreground: #c9d1d9;--ch-t-input-border: #30363d;--ch-t-icon-foreground: #8b949e;--ch-t-sideBar-background: #010409;--ch-t-sideBar-foreground: #c9d1d9;--ch-t-sideBar-border: #30363d;--ch-t-list-activeSelectionBackground: #6e768166;--ch-t-list-activeSelectionForeground: #c9d1d9;--ch-t-list-hoverBackground: #6e76811a;--ch-t-list-hoverForeground: #c9d1d9; }</style>
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<p>Build, validate, and run a Langflow Extension bundle to create a single-component extension you can <code>pip-install</code> or load using <code>lfx extension dev</code>.</p>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites" translate="no"></a></h2>
|
||
<ul>
|
||
<li class="">Python 3.11 or greater</li>
|
||
<li class=""><code>langflow</code> installed with <code>uv pip install langflow</code>. The <code>lfx</code> CLI provides every command in this guide. For more information, see <a class="" href="/get-started-installation#install-and-run-the-langflow-oss-python-package">Install the Langflow OSS package</a>.</li>
|
||
</ul>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="create-an-extension">Create an extension<a href="#create-an-extension" class="hash-link" aria-label="Direct link to Create an extension" title="Direct link to Create an extension" translate="no"></a></h2>
|
||
<ol>
|
||
<li class="">
|
||
<p>Scaffold a new extension:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx extension init my-extension</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>cd my-extension</span></div></div><br></code></div></div>
|
||
<p>This creates the canonical layout the loader expects:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span>my-extension/</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span>├── extension.json # the v0 manifest</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span>├── pyproject.toml # so the bundle is pip-installable</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span>└── src/</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> └── lfx_my_extension/</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> ├── __init__.py</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> ├── extension.json # symlink/copy used by importlib at runtime</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> └── components/</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> └── my_bundle/</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> ├── __init__.py</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> └── my_component.py</span></div></div><br></code></div></div>
|
||
<p>For more information, see <a class="" href="/extensions-manifest">Manifest reference</a>.</p>
|
||
</li>
|
||
<li class="">
|
||
<p>To edit the component, open <code>src/lfx_my_extension/components/my_bundle/my_component.py</code>.
|
||
The scaffold ships a working <code>Component</code> subclass that prints <code>"Hello, {name}!"</code></p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span>from lfx.custom.custom_component.component import Component</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span>from lfx.io import MessageTextInput, Output</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span>from lfx.schema.message import Message</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span>class HelloComponent(Component):</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> display_name = "Hello"</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> description = "Greets the caller."</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> inputs = [MessageTextInput(name="who", display_name="Who?", value="world")]</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> outputs = [Output(display_name="Greeting", name="greeting", method="build_message")]</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> def build_message(self) -> Message:</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> return Message(text=f"Hello, {self.who}!")</span></div></div><br></code></div></div>
|
||
<p>The full surface available to bundle code is enumerated in <a href="https://github.com/langflow-ai/langflow/blob/main/BUNDLE_API.md" target="_blank" rel="noopener noreferrer" class=""><code>BUNDLE_API.md</code></a>.
|
||
Anything outside of <a href="https://github.com/langflow-ai/langflow/blob/main/BUNDLE_API.md" target="_blank" rel="noopener noreferrer" class=""><code>BUNDLE_API.md</code></a> is not part of the API contract, and may move or break between releases.</p>
|
||
</li>
|
||
<li class="">
|
||
<p>Before launching Langflow, run the static extension checker.</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx extension validate .</span></div></div><br></code></div></div>
|
||
<p>The validator parses the manifest and reports typed errors.
|
||
It does not execute imports by default, so it is safe to run against an extension you just downloaded. Use <code>--execute-imports</code> only when you trust the source — it runs the import probe in a subprocess.</p>
|
||
</li>
|
||
<li class="">
|
||
<p>Run Langflow with the extension loaded.</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx extension dev .</span></div></div><br></code></div></div>
|
||
<p>This launches a Langflow dev server with <code>my-extension</code> registered at the <code>@official</code> slot. The Hello component appears in the Langflow UI component list under the bundle name in <code>extension.json</code>.</p>
|
||
<p>To see what the loader picked up:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>lfx extension list --format json</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li class="">
|
||
<p>Iterate with reload.
|
||
Edit the component, save, then click the <strong>Reload</strong> action in the palette's bundle header (or run <code>lfx extension reload --bundle my_bundle</code>). The atomic-swap reload pipeline replaces the component in place; in-flight flows keep the pre-swap class so a running execution is never interrupted.</p>
|
||
<p>Reload only works in Mode A (local dev). Production deployments rebuild the Docker image.</p>
|
||
</li>
|
||
<li class="">
|
||
<p>Ship the extension.</p>
|
||
<p>Once the extension works locally, publish the package to PyPI:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>python -m build # builds the wheel + sdist</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>twine upload dist/* # publish to PyPI</span></div></div><br></code></div></div>
|
||
<p>To install the extension into a Langflow environment with a regular <code>pip install</code>:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>pip install lfx-my-extension</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>langflow run</span></div></div><br></code></div></div>
|
||
<p>Discovery happens at server startup.
|
||
The bundle appears in the palette without further configuration.</p>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="see-also">See also<a href="#see-also" class="hash-link" aria-label="Direct link to See also" title="Direct link to See also" translate="no"></a></h2>
|
||
<ul>
|
||
<li class=""><a class="" href="/extensions-overview">Bundle extensions overview</a></li>
|
||
<li class=""><a class="" href="/extensions-manifest">Manifest reference</a></li>
|
||
</ul></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/extensions-overview"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Langflow Extensions overview</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/extensions-manifest"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Manifest reference</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#prerequisites" class="table-of-contents__link toc-highlight">Prerequisites</a></li><li><a href="#create-an-extension" class="table-of-contents__link toc-highlight">Create an extension</a></li><li><a href="#see-also" class="table-of-contents__link toc-highlight">See also</a></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><div class="footer-links">
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