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<!-- -->
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<p>New components are added as objects of the <a href="https://github.com/langflow-ai/langflow/blob/main/src/lfx/src/lfx/custom/custom_component/component.py" target="_blank" rel="noopener noreferrer"><code>Component</code></a> class.</p>
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<p>Dependencies are added to the <a href="https://github.com/langflow-ai/langflow/blob/main/pyproject.toml" target="_blank" rel="noopener noreferrer">pyproject.toml</a> file.</p>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="contribute-an-example-component-to-langflow">Contribute an example component to Langflow<a href="#contribute-an-example-component-to-langflow" class="hash-link" aria-label="Direct link to Contribute an example component to Langflow" title="Direct link to Contribute an example component to Langflow"></a></h2>
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<p>Anyone can contribute an example component. For example, to create a new data component called <strong>DataFrame processor</strong>, follow these steps to contribute it to Langflow.</p>
|
||
<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>
|
||
<ol>
|
||
<li>
|
||
<p>Create a Python file for your component, such as <code>dataframe_processor.py</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p>Write your component as an object of the <a href="https://github.com/langflow-ai/langflow/blob/main/src/backend/base/langflow/custom/custom_component/component.py" target="_blank" rel="noopener noreferrer"><code>Component</code></a> class. Create a new class that inherits from <code>Component</code> and override the base class's methods.</p>
|
||
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>Backwards compatibility</div><div class="admonitionContent_BuS1"><p>The <code>lfx</code> import path replaced the <code>import from langflow.custom import Component</code> in Langflow 1.7, but the original input is still compatible and works the same way.</p></div></div>
|
||
<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>from typing import Any, Dict, Optional</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>import pandas as pd</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</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">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>class DataFrameProcessor(Component):</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> """A component that processes pandas DataFrames with various operations."""</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li>
|
||
<p>Define class attributes to provide information about your custom component:</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 typing import Any, Dict, Optional</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span>import pandas as pd</span></div></div><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></span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span>class DataFrameProcessor(Component):</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> """A component that processes pandas DataFrames with various operations."""</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> display_name: str = "DataFrame Processor"</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> description: str = "Process and transform pandas DataFrames with various operations like filtering, sorting, and aggregation."</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> documentation: str = "https://docs.langflow.org/components-dataframe-processor"</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> icon: str = "DataframeIcon"</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> priority: int = 100</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> name: str = "dataframe_processor"</span></div></div><br></code></div></div>
|
||
<ul>
|
||
<li><code>display_name</code>: A user-friendly name shown in the visual editor.</li>
|
||
<li><code>description</code>: A brief description of what your component does.</li>
|
||
<li><code>documentation</code>: A link to detailed documentation.</li>
|
||
<li><code>icon</code>: An emoji or icon identifier for visual representation.
|
||
Langflow uses <a href="https://lucide.dev/icons" target="_blank" rel="noopener noreferrer">Lucide</a> for icons. To assign an icon to your component, set the icon attribute to the name of a Lucide icon as a string, such as <code>icon = "file-text"</code>. Langflow renders icons from the Lucide library automatically.
|
||
For more information, see <a href="/contributing-bundles#add-the-bundle-to-the-frontend-folder">Contributing bundles</a>.</li>
|
||
<li><code>priority</code>: An optional integer to control display order. Lower numbers appear first.</li>
|
||
<li><code>name</code>: An optional internal identifier that defaults to class name.</li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<p>Define the component's interface by specifying its inputs, outputs, and the method that will process them. The method name must match the <code>method</code> field in your outputs list, as this is how Langflow knows which method to call to generate each output.</p>
|
||
<p>This example creates a minimal custom component skeleton.</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">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span>from typing import Any, Dict, Optional</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span>import pandas as pd</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</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">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span>class DataFrameProcessor(Component):</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> """A component that processes pandas DataFrames with various operations."""</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> display_name: str = "DataFrame Processor"</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> description: str = "Process and transform pandas DataFrames with various operations like filtering, sorting, and aggregation."</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> documentation: str = "https://docs.langflow.org/components-dataframe-processor"</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> icon: str = "DataframeIcon"</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> priority: int = 100</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> name: str = "dataframe_processor"</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> # input and output lists</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> inputs = []</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> outputs = []</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> # method</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> def some_output_method(self):</span></div></div><div><span class="ch-code-line-number">_<!-- -->21</span><div style="display:inline-block;margin-left:16px"><span> return ...</span></div></div><br></code></div></div>
|
||
</li>
|
||
</ol>
|
||
<ol start="5">
|
||
<li>
|
||
<p>Save the <code>dataframe_processor.py</code> to the <code>src/lfx/src/lfx/components</code> directory.
|
||
This example adds a data component, so add it to the <code>/data</code> directory.</p>
|
||
</li>
|
||
<li>
|
||
<p>Add the component dependency to <code>src/lfx/src/lfx/components/data/__init__.py</code> as <code>from .DataFrameProcessor import DataFrameProcessor</code>.
|
||
You can view the <a href="https://github.com/langflow-ai/langflow/blob/dev/src/lfx/src/lfx/components/data/__init__.py" target="_blank" rel="noopener noreferrer">/data/<strong>init</strong>.py</a> in the Langflow repository.</p>
|
||
</li>
|
||
<li>
|
||
<p>Add any new dependencies to the <a href="https://github.com/langflow-ai/langflow/blob/main/pyproject.toml#L20" target="_blank" rel="noopener noreferrer">pyproject.toml</a> file.</p>
|
||
</li>
|
||
<li>
|
||
<p>Submit documentation for your component. For this example component, you would submit documentation to the <a href="https://github.com/langflow-ai/langflow/blob/main/docs/docs/Components/components-data.mdx" target="_blank" rel="noopener noreferrer">Data components page</a>.</p>
|
||
</li>
|
||
<li>
|
||
<p>Submit your changes as a pull request. The Langflow team will review, suggest changes, and add your component to Langflow.</p>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="best-practices-for-modifying-components">Best practices for modifying components<a href="#best-practices-for-modifying-components" class="hash-link" aria-label="Direct link to Best practices for modifying components" title="Direct link to Best practices for modifying components"></a></h2>
|
||
<p>When creating or updating components, follow these best practices to maintain backward compatibility and ensure a smooth experience for users.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="dont-rename-the-class-or-name-attribute">Don't rename the class or <code>name</code> attribute<a href="#dont-rename-the-class-or-name-attribute" class="hash-link" aria-label="Direct link to dont-rename-the-class-or-name-attribute" title="Direct link to dont-rename-the-class-or-name-attribute"></a></h3>
|
||
<p>Changing the class name or the <code>name</code> attribute breaks the component for all existing users. This happens because the frontend tests the <code>type</code> attribute, which is set to the class' name or the <code>name</code> attribute. If these names change, the component effectively becomes a new component, and the old component disappears.</p>
|
||
<p>Instead, do the following:</p>
|
||
<ul>
|
||
<li>Change only the display name if the old name is unclear.</li>
|
||
<li>Change only the display name if functionality changes but remains related.</li>
|
||
<li>If a new internal name is necessary, mark the old component as <code>legacy=true</code> and create a new component.</li>
|
||
</ul>
|
||
<p>For example:</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>class MyCustomComponent(BaseComponent):</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> name = "my_custom_component_internal"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> legacy = True</span></div></div><br></code></div></div>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="dont-remove-fields-and-outputs">Don't remove fields and outputs<a href="#dont-remove-fields-and-outputs" class="hash-link" aria-label="Direct link to Don't remove fields and outputs" title="Direct link to Don't remove fields and outputs"></a></h3>
|
||
<p>Removing fields or outputs can cause edges to disconnect and change the behavior of components.</p>
|
||
<p>Instead, mark fields as <code>deprecated</code> and keep them in the same location. If removal is absolutely necessary, you must define and document a migration plan. Always clearly communicate any changes in the field's information to users.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="maintain-outdated-components-as-legacy">Maintain outdated components as legacy<a href="#maintain-outdated-components-as-legacy" class="hash-link" aria-label="Direct link to Maintain outdated components as legacy" title="Direct link to Maintain outdated components as legacy"></a></h3>
|
||
<p>When updating components, create them as completely separate entities while maintaining the old component as a legacy version. Always ensure backward compatibility and never remove methods and attributes from base classes, such as <code>LCModelComponent</code>.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="favor-asynchronous-methods">Favor asynchronous methods<a href="#favor-asynchronous-methods" class="hash-link" aria-label="Direct link to Favor asynchronous methods" title="Direct link to Favor asynchronous methods"></a></h3>
|
||
<p>Always favor asynchronous methods and functions in your components. When interacting with files, use <code>aiofile</code> and <code>anyio.Path</code> for better performance and compatibility.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="include-tests-with-your-component">Include tests with your component<a href="#include-tests-with-your-component" class="hash-link" aria-label="Direct link to Include tests with your component" title="Direct link to Include tests with your component"></a></h3>
|
||
<p>Include tests for your changes using <code>ComponentTestBase</code> classes. For more information, see <a href="/contributing-component-tests">Contribute component tests</a>.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="documentation">Documentation<a href="#documentation" class="hash-link" aria-label="Direct link to Documentation" title="Direct link to Documentation"></a></h3>
|
||
<p>When documenting changes in pull requests, clearly explain <em>what</em> changed, such as display name updates or new fields, <em>why</em> it changed, such as improvements or bug fixes, and the <em>impact</em> on existing users.</p>
|
||
<p>For example:</p>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Example PR</summary><div><div class="collapsibleContent_i85q"><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">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span># Pull request with changes to Notify component</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>This pull request updates the Notify component.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>## What changed</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- Added new `timeout` field to control how long the component waits for a response.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- Renamed `message` field to `notification_text` for clarity.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- Added support for async operations.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- Deprecated the `retry_count` field in favor of `max_retries`.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>## Why it changed</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- `timeout` field addresses user requests for better control over wait times.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- `message` to `notification_text` change makes the field's purpose clearer.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- Async support improves performance in complex flows.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- `retry_count` to `max_retries` aligns with common retry pattern terminology.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>## Impact on users</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- New `timeout` field is optional (defaults to 30 seconds).</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- Users will see a deprecation warning for `retry_count`.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span> - Migration: Replace `retry_count` with `max_retries` in existing flows.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span> - Both fields will work until version 2.0.</span></div></div><div><span class="ch-code-line-number">_<!-- -->22</span><div style="display:inline-block;margin-left:16px"><span>- No action needed for async support - it's backward compatible.</span></div></div><br></code></div></div></div></div></details>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="example-pull-request-flow">Example pull request flow<a href="#example-pull-request-flow" class="hash-link" aria-label="Direct link to Example pull request flow" title="Direct link to Example pull request flow"></a></h2>
|
||
<ol>
|
||
<li>Create or update a component.
|
||
Maintain the class name and <code>name</code> attribute if the purpose remains the same.
|
||
Otherwise, create a new component and move the old component to <code>legacy</code>.</li>
|
||
<li>Add tests.
|
||
Create tests using one of the <code>ComponentTestBase</code> classes.
|
||
For more information, see <a href="/contributing-component-tests">Contribute component tests</a>.</li>
|
||
<li>Flag outdated fields and outputs as <code>deprecated</code> and keep them in the same location to ensure backward compatibility.</li>
|
||
<li>Document your changes.
|
||
Include migration instructions if breaking changes occur.</li>
|
||
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