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<p>LangSmith is a full-lifecycle DevOps service from LangChain that provides monitoring and observability. To integrate with Langflow, add your LangChain API key and configuration as Langflow environment variables, and then start Langflow.</p>
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<ol>
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<li>Obtain your LangChain API key from <a href="https://smith.langchain.com/" target="_blank" rel="noopener noreferrer">https://smith.langchain.com</a></li>
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<li>Add the following keys to the Langflow .env file.
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Replace <code>LANGCHAIN_API_KEY</code> and <code>LANGSMITH_PROJECT_NAME</code> with your LangChain API key.</li>
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</ol>
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<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>LANGSMITH_TRACING=true</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGSMITH_ENDPOINT=https://api.smith.langchain.com/</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGSMITH_API_KEY=LANGCHAIN_API_KEY</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGSMITH_PROJECT=LANGSMITH_PROJECT_NAME</span></div></div><br></code></div></div>
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<p>Alternatively, export the environment variables in your terminal:</p>
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<p><code>export LANGSMITH_TRACING=true && export LANGSMITH_ENDPOINT="https://api.smith.langchain.com/" && export LANGSMITH_API_KEY="LANGCHAIN_API_KEY" && export LANGSMITH_PROJECT="LANGSMITH_PROJECT_NAME"</code></p>
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<ol start="3">
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<li>Restart Langflow using <code>langflow run --env-file .env</code></li>
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<li>Run a project in Langflow.</li>
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<li>View the Langsmith dashboard for monitoring and observability.</li>
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</ol>
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<p><img decoding="async" loading="lazy" src="/assets/images/langsmith-dashboard-ce13945c95550300648084dda81408fd.png" width="3136" height="1762" class="img_ev3q"></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-langfuse"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Langfuse</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/integrations-langwatch"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">LangWatch</div></a></nav></div></div></div></div></main></div></div></div><footer class="footer"><div class="container container-fluid"><div class="row footer__links"><div class="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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