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<p><a href="https://app.langwatch.ai/" target="_blank" rel="noopener noreferrer" class="">LangWatch</a> is an all-in-one LLMOps platform for monitoring, observability, analytics, evaluations and alerting for getting user insights and improve your LLM workflows.</p>
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<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="integrate-langwatch-observability">Integrate LangWatch observability<a href="#integrate-langwatch-observability" class="hash-link" aria-label="Direct link to Integrate LangWatch observability" title="Direct link to Integrate LangWatch observability" translate="no"></a></h2>
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<div class="theme-admonition theme-admonition-note admonition_xJq3 alert alert--secondary"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>LangWatch is unavailable in the default Docker images</div><div class="admonitionContent_BuS1"><p>The official Langflow Docker images (<code>langflowai/langflow</code> and <code>langflowai/langflow-nightly</code>) run on Python 3.14, and the <code>langwatch</code> package doesn't yet support Python 3.14 (it requires Python <code><3.14</code>). As a result, LangWatch tracing is <strong>not available in the default Docker images</strong> even when <code>LANGWATCH_API_KEY</code> is set. Langflow logs a warning on the first flow run and continues without LangWatch tracing.</p><p>To use LangWatch, run Langflow on Python 3.10–3.13, such as the PyPI distribution (<code>pip install langflow</code>) or the Langflow desktop app. If you need a container, build a custom image on a Python 3.10–3.13 base.</p></div></div>
|
||
<p>To integrate with Langflow, add your LangWatch API key as a Langflow environment variable:</p>
|
||
<ol>
|
||
<li class="">
|
||
<p>Get a LangWatch API key from your LangWatch account.</p>
|
||
</li>
|
||
<li class="">
|
||
<p>Add the key to your Langflow <code>.env</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>LANGWATCH_API_KEY="API_KEY_STRING"</span></div></div><br></code></div></div>
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||
<p>Alternatively, you can set the environment variable in your terminal session:</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>export LANGWATCH_API_KEY="API_KEY_STRING"</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li class="">
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||
<p>Restart Langflow with your <code>.env</code> file, if you modified the Langflow <code>.env</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>langflow run --env-file .env</span></div></div><br></code></div></div>
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</li>
|
||
<li class="">
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||
<p>Run a flow.</p>
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||
</li>
|
||
<li class="">
|
||
<p>View the LangWatch dashboard for monitoring and observability.</p>
|
||
</li>
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</ol>
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<p><img decoding="async" loading="lazy" alt="LangWatch dashboard" src="/assets/images/langwatch-dashboard-5f33bb25bb4d9022e08a4dab2592ca86.png" width="1987" height="1032" class="img_ev3q"></p>
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<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="use-the-langwatch-evaluator">Use the LangWatch Evaluator<a href="#use-the-langwatch-evaluator" class="hash-link" aria-label="Direct link to Use the LangWatch Evaluator" title="Direct link to Use the LangWatch Evaluator" translate="no"></a></h2>
|
||
<p>In your flows, you can use the <strong>LangWatch Evaluator</strong> component to use LangWatch's evaluation endpoints to assess a model's performance.
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This component is available in the <strong>LangWatch</strong> <a class="" href="/components-bundle-components">bundle</a>.</p></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/integrations-langsmith"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">LangSmith</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/integrations-openlayer"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Openlayer</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="#integrate-langwatch-observability" class="table-of-contents__link toc-highlight">Integrate LangWatch observability</a></li><li><a href="#use-the-langwatch-evaluator" class="table-of-contents__link toc-highlight">Use the LangWatch Evaluator</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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