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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_VOVn"><div class="docItemContainer_Djhp"><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" class="breadcrumbHomeIcon_YNFT"><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">Integrations</span></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Langfuse</span></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"><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>
|
||
<!-- -->
|
||
<header><h1>Integrate Langfuse with Langflow</h1></header>
|
||
<p><a href="https://langfuse.com" target="_blank" rel="noopener noreferrer">Langfuse</a> (<a href="https://github.com/langfuse/langfuse" target="_blank" rel="noopener noreferrer">GitHub</a>) is an open-source platform for LLM observability. It provides tracing and monitoring capabilities for AI applications, helping developers debug, analyze, and optimize their AI systems. Langfuse integrates with various tools and frameworks such as workflows builders like Langflow.</p>
|
||
<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>
|
||
<iframe width="760" height="415" src="https://www.youtube.com/embed/SA9gGbzwNGU?si=eDKvdtvhb3fJCSbl" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin"></iframe>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites"></a></h2>
|
||
<ul>
|
||
<li>A project in Langflow with a runnable flow</li>
|
||
<li>A <a href="https://cloud.langfuse.com" target="_blank" rel="noopener noreferrer">Langfuse Cloud</a> or <a href="https://langfuse.com/self-hosting" target="_blank" rel="noopener noreferrer">self-hosted Langfuse</a> account</li>
|
||
</ul>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="set-langfuse-credentials-as-environment-variables">Set Langfuse credentials as environment variables<a href="#set-langfuse-credentials-as-environment-variables" class="hash-link" aria-label="Direct link to Set Langfuse credentials as environment variables" title="Direct link to Set Langfuse credentials as environment variables"></a></h2>
|
||
<ol>
|
||
<li>
|
||
<p>In Langfuse, go to <strong>Project Settings</strong>, and then create a new set of API keys.</p>
|
||
</li>
|
||
<li>
|
||
<p>Copy the following API key information:</p>
|
||
</li>
|
||
</ol>
|
||
<ul>
|
||
<li>Secret Key</li>
|
||
<li>Public Key</li>
|
||
<li>Host URL</li>
|
||
</ul>
|
||
<ol start="3">
|
||
<li>Set your Langfuse project credentials as environment variables in the same environment where you run Langflow.</li>
|
||
</ol>
|
||
<p>The following examples set environment variables in a Linux or macOS terminal session or in a Windows command prompt session:
|
||
Replace <code>SECRET_KEY</code>, <code>PUBLIC_KEY</code>, and <code>HOST_URL</code> with the API key information you copied from Langfuse.</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>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="start-langflow-and-view-traces-in-langfuse">Start Langflow and view traces in Langfuse<a href="#start-langflow-and-view-traces-in-langfuse" class="hash-link" aria-label="Direct link to Start Langflow and view traces in Langfuse" title="Direct link to Start Langflow and view traces in Langfuse"></a></h2>
|
||
<ol>
|
||
<li>Start Langflow in the same terminal or environment where you set the environment variables:</li>
|
||
</ol>
|
||
<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 run langflow run</span></div></div><br></code></div></div>
|
||
<ol start="2">
|
||
<li>
|
||
<p>In Langflow, open an existing project, and then run a flow.</p>
|
||
<p>Langflow automatically collects and sends tracing data about the flow execution to Langfuse.</p>
|
||
</li>
|
||
<li>
|
||
<p>View the collected data in your Langfuse project dashboard.</p>
|
||
</li>
|
||
</ol>
|
||
<p><img decoding="async" loading="lazy" src="https://langfuse.com//images/blog/langflow-langfuse/langflow-example-trace.png" alt="Example trace in Langfuse" class="img_ev3q"></p>
|
||
<p>For a live public example trace in a Langfuse dashboard, see <a href="https://cloud.langfuse.com/project/cm0nywmaa005c3ol2msoisiho/traces/f016ae6d-4527-43f5-93ba-9d78388cd3d9?timestamp=2024-11-15T10%3A22%3A56.378Z&observation=c3680212-31f0-46e2-9310-add4352e4cc7" target="_blank" rel="noopener noreferrer">Public example trace in Langfuse</a>.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="disable-langfuse-tracing">Disable Langfuse Tracing<a href="#disable-langfuse-tracing" class="hash-link" aria-label="Direct link to Disable Langfuse Tracing" title="Direct link to Disable Langfuse Tracing"></a></h2>
|
||
<p>To disable the Langfuse integration, remove the environment variables you set in the previous steps and restart Langflow.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="run-langfuse-and-langflow-with-docker-compose">Run Langfuse and Langflow with Docker Compose<a href="#run-langfuse-and-langflow-with-docker-compose" class="hash-link" aria-label="Direct link to Run Langfuse and Langflow with Docker Compose" title="Direct link to Run Langfuse and Langflow with Docker Compose"></a></h2>
|
||
<p>If you prefer to self-host Langfuse, you can run both services with Docker Compose.</p>
|
||
<ol>
|
||
<li>
|
||
<p>In Langfuse, go to <strong>Project Settings</strong>, and then create a new set of API keys.</p>
|
||
</li>
|
||
<li>
|
||
<p>Copy the following API key information:</p>
|
||
</li>
|
||
</ol>
|
||
<ul>
|
||
<li>Secret Key</li>
|
||
<li>Public Key</li>
|
||
<li>Host URL</li>
|
||
</ul>
|
||
<ol start="3">
|
||
<li>Add your Langflow API keys to your <code>docker-compose.yml</code> file.
|
||
An example <a href="https://github.com/langflow-ai/langflow/blob/main/docker_example/docker-compose.yml" target="_blank" rel="noopener noreferrer">docker-compose.yml</a> file is available in the Langflow GitHub repo.</li>
|
||
</ol>
|
||
<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">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span>services:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> langflow:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> image: langflowai/langflow:latest # or another version tag on https://hub.docker.com/r/langflowai/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> pull_policy: always # set to 'always' when using 'latest' image</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - "7860:7860"</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> depends_on:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - postgres</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFLOW_DATABASE_URL=postgresql://langflow:langflow@postgres:5432/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> # This variable defines where the logs, file storage, monitor data and secret keys are stored.</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFLOW_CONFIG_DIR=app/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFUSE_SECRET_KEY=sk-...</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFUSE_PUBLIC_KEY=pk-...</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFUSE_HOST=https://us.cloud.langfuse.com</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - langflow-data:/app/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> postgres:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> image: postgres:16</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> POSTGRES_USER: langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> POSTGRES_PASSWORD: langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> POSTGRES_DB: langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - "5432:5432"</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - langflow-postgres:/var/lib/postgresql/data</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span>volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> langflow-postgres:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> langflow-data:</span></div></div><br></code></div></div>
|
||
<ol start="4">
|
||
<li>Start the Docker container.</li>
|
||
</ol>
|
||
<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>docker-compose up</span></div></div><br></code></div></div>
|
||
<ol start="5">
|
||
<li>To confirm Langfuse is connected to your Langflow container, run this command.
|
||
Ensure you've exported <code>LANGFLOW_HOST</code> as a variable in your terminal.</li>
|
||
</ol>
|
||
<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>docker compose exec langflow python -c "import requests, os; addr = os.environ.get('LANGFUSE_HOST'); print(addr); res = requests.get(addr, timeout=5); print(res.status_code)"</span></div></div><br></code></div></div>
|
||
<p>An output similar to this indicates success:</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>https://us.cloud.langfuse.com</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>200</span></div></div><br></code></div></div></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/integrations-google-big-query"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Integrate Google BigQuery with Langflow</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 href="#prerequisites" class="table-of-contents__link toc-highlight">Prerequisites</a></li><li><a href="#set-langfuse-credentials-as-environment-variables" class="table-of-contents__link toc-highlight">Set Langfuse credentials as environment variables</a></li><li><a href="#start-langflow-and-view-traces-in-langfuse" class="table-of-contents__link toc-highlight">Start Langflow and view traces in Langfuse</a></li><li><a href="#disable-langfuse-tracing" class="table-of-contents__link toc-highlight">Disable Langfuse Tracing</a></li><li><a href="#run-langfuse-and-langflow-with-docker-compose" class="table-of-contents__link toc-highlight">Run Langfuse and Langflow with Docker Compose</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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