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<p>Langflow provides optional dependency groups and support for custom dependencies to extend Langflow functionality. This guide covers how to add dependencies for different Langflow installations, including Langflow Desktop and Langflow OSS.</p>
<p>The Langflow codebase uses two <code>pyproject.toml</code> files to manage dependencies, with one for <code>base</code> and one for <code>main</code>:</p>
<ul>
<li>The <code>main</code> package is managed by the root level <code>pyproject.toml</code>, and it includes end-user features and main application code, such as Langchain and OpenAI.</li>
<li>The <code>base</code> package is managed at <code>src/backend/base/pyproject.toml</code>, and it includes core infrastructure, such as the FastAPI web framework.</li>
</ul>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="langflow-desktop">Install custom dependencies in Langflow Desktop<a href="#langflow-desktop" class="hash-link" aria-label="Direct link to Install custom dependencies in Langflow Desktop" title="Direct link to Install custom dependencies in Langflow Desktop"></a></h2>
<p>To add dependencies to Langflow Desktop, add an entry for the package to the application&#x27;s <code>requirements.txt</code> file:</p>
<ul>
<li>On macOS, the file is located at <code>/Users/USER/.langflow/data/requirements.txt</code>.</li>
<li>On Windows, the file is located at <code>C:\Users\USER\AppData\Roaming\com.Langflow\data\requirements.txt</code>.</li>
</ul>
<p>Add each dependency to <code>requirements.txt</code> on its own line in the format <code>DEPENDENCY==VERSION</code>, such as <code>docling==2.40.0</code>.</p>
<p>Restart Langflow Desktop to install the dependencies.</p>
<p>If you need to change or uninstall custom dependencies, edit the <code>requirements.txt</code> file, and then restart Langflow Desktop.</p>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="install-custom-dependencies-in-langflow-oss">Install custom dependencies in Langflow OSS<a href="#install-custom-dependencies-in-langflow-oss" class="hash-link" aria-label="Direct link to Install custom dependencies in Langflow OSS" title="Direct link to Install custom dependencies in Langflow OSS"></a></h2>
<p>To install your own custom dependencies in your Langflow environment, add them with your package manager.</p>
<p>If you&#x27;re working within a cloned Langflow repository, add dependencies with <code>uv add</code> because there is already a <code>pyproject.toml</code> file for uv to reference:</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>uv add DEPENDENCY</span></div></div><br></code></div></div>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="install-optional-dependency-groups">Install optional dependency groups<a href="#install-optional-dependency-groups" class="hash-link" aria-label="Direct link to Install optional dependency groups" title="Direct link to Install optional dependency groups"></a></h3>
<p>Langflow OSS provides optional dependency groups that extend its functionality.</p>
<p>These dependencies are listed in the <a href="https://github.com/langflow-ai/langflow/blob/main/pyproject.toml#L194" target="_blank" rel="noopener noreferrer">pyproject.toml</a> file under <code>[project.optional-dependencies]</code>.</p>
<p>Install dependency groups using pip&#x27;s <code>[extras]</code> syntax. For example, to install Langflow with the <code>postgresql</code> dependency group, enter the following command:</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>uv pip install &quot;langflow[postgresql]&quot;</span></div></div><br></code></div></div>
<p>To install multiple extras, use commas to separate each dependency group:</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>uv pip install &quot;langflow[local,postgresql]&quot;</span></div></div><br></code></div></div>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="use-a-virtual-environment-to-test-custom-dependencies">Use a virtual environment to test custom dependencies<a href="#use-a-virtual-environment-to-test-custom-dependencies" class="hash-link" aria-label="Direct link to Use a virtual environment to test custom dependencies" title="Direct link to Use a virtual environment to test custom dependencies"></a></h3>
<p>When testing locally, use a virtual environment to isolate your dependencies and prevent conflicts with other Python projects.</p>
<p>For example, if you want to experiment with <code>matplotlib</code> with Langflow:</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># Create and activate a virtual environment</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>uv venv YOUR_LANGFLOW_VENV</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>source YOUR_LANGFLOW_VENV/bin/activate</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># Install langflow and your additional dependency</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>uv pip install langflow matplotlib</span></div></div><br></code></div></div>
<p>If you&#x27;re working within a cloned Langflow repository, add dependencies with <code>uv add</code> to reference the existing <code>pyproject.toml</code> files:</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>uv add matplotlib</span></div></div><br></code></div></div>
<p>The <code>uv add</code> commands automatically update the <code>uv.lock</code> file in the appropriate location.</p>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="add-dependencies-to-the-langflow-codebase">Add dependencies to the Langflow codebase<a href="#add-dependencies-to-the-langflow-codebase" class="hash-link" aria-label="Direct link to Add dependencies to the Langflow codebase" title="Direct link to Add dependencies to the Langflow codebase"></a></h2>
<p>When contributing to the Langflow codebase, you might need to add dependencies to Langflow.</p>
<p>Langflow uses a workspace with two packages, each with different types of dependencies.</p>
<p>To add a dependency to the <code>main</code> package, run <code>uv add DEPENDENCY</code> from the project root.
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>uv add matplotlib</span></div></div><br></code></div></div>
<p>Dependencies can be added to the <code>main</code> package as regular dependencies at <code>[project.dependencies]</code> or optional dependencies at <code>[project.optional-dependencies]</code>.</p>
<p>To add a dependency to the <code>base</code> package, navigate to <code>src/backend/base</code> and run:</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>cd src/backend/base &amp;&amp; uv add DEPENDENCY</span></div></div><br></code></div></div>
<p>To add a development dependency for testing, linting, or debugging, navigate to <code>src/backend/base</code> and run:</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>cd src/backend/base &amp;&amp; uv add --group dev DEPENDENCY</span></div></div><br></code></div></div>
<p>Dependencies can be added to the <code>base</code> package as regular dependencies at <code>[project.dependencies]</code>, development dependencies at <code>[dependency-groups.dev]</code>, or optional dependencies at <code>[project.optional-dependencies]</code>.</p>
<p>You can optionally use <code>make add</code> instead of <code>uv add</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># Equivalent to: uv add matplotlib</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>make add main=&quot;matplotlib&quot;</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># Equivalent to: cd src/backend/base &amp;&amp; uv add --group dev matplotlib</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>make add devel=&quot;matplotlib&quot;</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># Equivalent to: cd src/backend/base &amp;&amp; uv add matplotlib</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>make add base=&quot;matplotlib&quot;</span></div></div><br></code></div></div>
<p>Alternatively, you can add these dependencies manually to the appropriate <code>pyproject.toml</code> file:</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>[project]</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>dependencies = [</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>    &quot;matplotlib&gt;=3.8.0&quot;</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>]</span></div></div><br></code></div></div>
<p>Or as an optional dependency in the main package:</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>[project.optional-dependencies]</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>plotting = [</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>    &quot;matplotlib&gt;=3.8.0&quot;,</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>]</span></div></div><br></code></div></div>
<p>Or as a development dependency in the base package:</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>[dependency-groups]</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>dev = [</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>    &quot;matplotlib&gt;=3.8.0&quot;,</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>]</span></div></div><br></code></div></div>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" 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"></a></h2>
<ul>
<li><a href="/develop-application">Containerize a Langflow application</a></li>
<li><a href="/components-custom-components">Create custom Python components</a></li>
<li><a href="/integrations-docling"><strong>Docling</strong> bundle</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="/api-keys-and-authentication"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">API keys and authentication</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/configuration-global-variables"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Global variables</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="#langflow-desktop" class="table-of-contents__link toc-highlight">Install custom dependencies in Langflow Desktop</a></li><li><a href="#install-custom-dependencies-in-langflow-oss" class="table-of-contents__link toc-highlight">Install custom dependencies in Langflow OSS</a><ul><li><a href="#install-optional-dependency-groups" class="table-of-contents__link toc-highlight">Install optional dependency groups</a></li><li><a href="#use-a-virtual-environment-to-test-custom-dependencies" class="table-of-contents__link toc-highlight">Use a virtual environment to test custom dependencies</a></li></ul></li><li><a href="#add-dependencies-to-the-langflow-codebase" class="table-of-contents__link toc-highlight">Add dependencies to the Langflow codebase</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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