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<!-- -->
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<h1>Integrate Langfuse with Langflow</h1>
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<p><a href="https://langfuse.com/" target="_blank" rel="noopener noreferrer">Langfuse</a> is an observability and analytics platform specifically designed for language models and AI applications.</p>
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<p>This guide walks you through how to configure Langflow to collect <a href="https://langfuse.com/docs/tracing" target="_blank" rel="noopener noreferrer">tracing</a> data about your flow executions and automatically send the data to Langfuse.</p>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="prerequisites">Prerequisites<a class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites" href="/integrations-langfuse#prerequisites"></a></h2>
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<ul>
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<li>A project in Langflow with a runnable flow</li>
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<li>A Langfuse Cloud account in any <a href="https://langfuse.com/faq/all/cloud-data-regions" target="_blank" rel="noopener noreferrer">data region</a></li>
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||
<li>A Langfuse organization and project</li>
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||
</ul>
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||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="create-langfuse-project-credentials">Create Langfuse project credentials<a class="hash-link" aria-label="Direct link to Create Langfuse project credentials" title="Direct link to Create Langfuse project credentials" href="/integrations-langfuse#create-langfuse-project-credentials"></a></h2>
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||
<ol>
|
||
<li>
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<p>In Langfuse, go to your project settings, and then create a new set of API keys.</p>
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</li>
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<li>
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<p>Copy the following API key information:</p>
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<ul>
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<li>Secret Key</li>
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<li>Public Key</li>
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<li>Host URL</li>
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||
</ul>
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||
</li>
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||
</ol>
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||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="set-your-langfuse-credentials-as-environment-variables">Set your Langfuse credentials as environment variables<a class="hash-link" aria-label="Direct link to Set your Langfuse credentials as environment variables" title="Direct link to Set your Langfuse credentials as environment variables" href="/integrations-langfuse#set-your-langfuse-credentials-as-environment-variables"></a></h2>
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<p>Set your Langfuse project credentials as environment variables in the same environment where you run Langflow.</p>
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||
<p>You can use any method you prefer to set environment variables.
|
||
The following examples show how to set environment variables in a terminal session (Linux or macOS) and in a command prompt session (Windows):</p>
|
||
<div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">Linux or macOS</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Windows</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><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>export LANGFUSE_SECRET_KEY=SECRET_KEY</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>export LANGFUSE_PUBLIC_KEY=PUBLIC_KEY</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>export LANGFUSE_HOST=HOST_URL</span></div></div><br></code></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><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>set LANGFUSE_SECRET_KEY=SECRET_KEY</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>set LANGFUSE_PUBLIC_KEY=PUBLIC_KEY</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>set LANGFUSE_HOST=HOST_URL</span></div></div><br></code></div></div></div></div></div>
|
||
<p>Replace <code>SECRET_KEY</code>, <code>PUBLIC_KEY</code>, and <code>HOST_URL</code> with the API key information you copied from Langfuse.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="start-langflow-and-run-a-flow">Start Langflow and run a flow<a class="hash-link" aria-label="Direct link to Start Langflow and run a flow" title="Direct link to Start Langflow and run a flow" href="/integrations-langfuse#start-langflow-and-run-a-flow"></a></h2>
|
||
<ol>
|
||
<li>
|
||
<p>Start Langflow in the same terminal or environment where you set the environment variables:</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 langflow run</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li>
|
||
<p>In Langflow, open and existing project, and then run a flow.</p>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="view-tracing-data-in-langfuse">View tracing data in Langfuse<a class="hash-link" aria-label="Direct link to View tracing data in Langfuse" title="Direct link to View tracing data in Langfuse" href="/integrations-langfuse#view-tracing-data-in-langfuse"></a></h2>
|
||
<p>Langflow automatically collects and sends tracing data about the flow execution to Langfuse.
|
||
You can view the collected data in your Langfuse project dashboard.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="disable-the-langfuse-integration">Disable the Langfuse integration<a class="hash-link" aria-label="Direct link to Disable the Langfuse integration" title="Direct link to Disable the Langfuse integration" href="/integrations-langfuse#disable-the-langfuse-integration"></a></h2>
|
||
<p>To disable the Langfuse integration, remove the environment variables you set in the previous steps and restart Langflow.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/integrations-assemblyai"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">AssemblyAI</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/integrations-langsmith"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">LangSmith</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 class="table-of-contents__link toc-highlight" href="/integrations-langfuse#prerequisites">Prerequisites</a></li><li><a class="table-of-contents__link toc-highlight" href="/integrations-langfuse#create-langfuse-project-credentials">Create Langfuse project credentials</a></li><li><a class="table-of-contents__link toc-highlight" href="/integrations-langfuse#set-your-langfuse-credentials-as-environment-variables">Set your Langfuse credentials as environment variables</a></li><li><a class="table-of-contents__link toc-highlight" href="/integrations-langfuse#start-langflow-and-run-a-flow">Start Langflow and run a flow</a></li><li><a class="table-of-contents__link toc-highlight" href="/integrations-langfuse#view-tracing-data-in-langfuse">View tracing data in Langfuse</a></li><li><a class="table-of-contents__link toc-highlight" href="/integrations-langfuse#disable-the-langfuse-integration">Disable the Langfuse integration</a></li></ul></div></div></div></div></main></div></div></div><div id="ms-floating-button" class="ms-fixed ms-bottom-4 ms-right-8 ms-z-[100] ms-flex ms-flex-col ms-items-end hover:ms-cursor-pointer"><div class="ms-relative ms-mb-4"><div style="background-color:#f6f6f6" class="ms-absolute -ms-bottom-1 ms-right-6 -ms-z-10 ms-h-4 ms-w-4 ms-rotate-45"></div><div style="background-color:#f6f6f6" class="ms-z-10 ms-flex ms-items-center ms-justify-center ms-rounded-lg ms-px-3 ms-py-2"><p style="color:#000000;margin:0" class="ms-text-sm">Hi, how can I help you?</p></div></div><div style="background-color:#f6f6f6" class="ms-flex ms-h-16 ms-w-16 ms-flex-col ms-items-center ms-justify-center ms-self-end ms-rounded-full ms-p-2 ms-transition"><div class="ms-rotate-0 ms-flex ms-h-full ms-w-full ms-transform ms-cursor-pointer ms-items-center ms-justify-center ms-rounded-full ms-transition-all ms-delay-75 ms-duration-100 ms-ease-in-out"><div style="color:#000000;font-size:22px;width:48px;height:48px;margin:0px;padding:0px;display:flex;align-items:center;justify-content:center;text-align:center"><img src="/img/chain.png" style="width:40px"></div></div></div><div></div></div></div>
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