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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">Develop</span></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Observability</span></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Logs</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"><header><h1>Logs</h1></header><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>
|
||
<!-- -->
|
||
<p>This page provides information about Langflow logs, including logs for individual flows and the Langflow application itself.</p>
|
||
<p>Langflow uses the <code>loguru</code> library for logging.</p>
|
||
<p>The default logfile is named <code>langflow.log</code>.
|
||
Langflow also produces logfiles for flows.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="log-storage">Log storage<a href="#log-storage" class="hash-link" aria-label="Direct link to Log storage" title="Direct link to Log storage"></a></h2>
|
||
<p>The default logfile storage location depends on your operating system:</p>
|
||
<ul>
|
||
<li><strong>macOS Desktop</strong>:<code>/Users/<username>/.langflow/cache</code></li>
|
||
<li><strong>Windows Desktop</strong>:<code>C:\Users\<username>\AppData\Roaming\com.Langflow\cache</code></li>
|
||
<li><strong>OSS macOS/Windows/Linux/WSL (<code>uv pip install</code>)</strong>: <code><path_to_venv>/lib/python3.12/site-packages/langflow/cache</code></li>
|
||
<li><strong>OSS macOS/Windows/Linux/WSL (<code>git clone</code>)</strong>: <code><path_to_clone>/src/backend/base/langflow/cache</code></li>
|
||
</ul>
|
||
<p>To customize log storage, see <a href="#configure-log-options">Configure log options</a>.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="configure-log-options">Configure log options<a href="#configure-log-options" class="hash-link" aria-label="Direct link to Configure log options" title="Direct link to Configure log options"></a></h2>
|
||
<p>Use <a href="/environment-variables">Langflow environment variables</a> to configure logging options in your Langflow <code>.env</code> file, and then start Langflow with <code>uv run langflow run --env-file .env</code>.</p>
|
||
<p>The following environment variables are available to configure logging:</p>
|
||
<ul>
|
||
<li>
|
||
<p><code>LANGFLOW_LOG_LEVEL</code>: Sets the log level as one of <code>DEBUG</code>, <code>ERROR</code> (default), <code>INFO</code>, <code>WARNING</code>, and <code>CRITICAL</code>. For example, <code>LANGFLOW_LOG_LEVEL=DEBUG</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p><code>LANGFLOW_LOG_FILE</code>: Sets the log file storage location if you want to use a non-default location.
|
||
For example, <code>LANGFLOW_LOG_FILE=path/to/logfile.log</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p><code>LANGFLOW_LOG_ENV</code>: Controls log output and formatting.</p>
|
||
<ul>
|
||
<li><code>LANGFLOW_LOG_ENV=container</code>: Outputs serialized JSON to stdout.</li>
|
||
<li><code>LANGFLOW_LOG_ENV=container_csv</code>: Outputs CSV-formatted plain text to stdout.</li>
|
||
<li><code>LANGFLOW_LOG_ENV=default</code> or unset: Outputs prettified output with <a href="https://rich.readthedocs.io/en/stable/reference/logging.html" target="_blank" rel="noopener noreferrer">RichHandler</a>.</li>
|
||
</ul>
|
||
</li>
|
||
<li>
|
||
<p><code>LANGFLOW_LOG_ROTATION</code> controls when the log file is rotated, either based on time or file size. By default, logs are rotated every 1 day.</p>
|
||
<ul>
|
||
<li>Time-based rotation: "1 day", "12 hours", "1 week"</li>
|
||
<li>Size-based rotation: "10 MB", "1 GB"</li>
|
||
<li>Disable rotation: "None" (log files will grow without limit)</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<p>A complete example <code>.env</code> file is available in the <a href="https://github.com/langflow-ai/langflow/blob/main/.env.example" target="_blank" rel="noopener noreferrer">Langflow repository</a>.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="flow-and-component-logs">Flow and component logs<a href="#flow-and-component-logs" class="hash-link" aria-label="Direct link to Flow and component logs" title="Direct link to Flow and component logs"></a></h2>
|
||
<p>After you run a flow, you can inspect the logs for the each component and flow run.
|
||
For example, you can inspect <code>Message</code> objects ingested and generated by <a href="/components-io"><strong>Input and Output</strong> components</a>.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="view-flow-logs">View flow logs<a href="#view-flow-logs" class="hash-link" aria-label="Direct link to View flow logs" title="Direct link to View flow logs"></a></h3>
|
||
<p>In the visual editor, click <strong>Logs</strong> to view logs for the entire flow:</p>
|
||
<p><img decoding="async" loading="lazy" alt="Logs pane" src="/assets/images/logs-cc30f076e63a5e443cf04855559703a3.png" width="4000" height="2180" class="img_ev3q"></p>
|
||
<p>Then, click the cells in the <strong>inputs</strong> and <strong>outputs</strong> columns to inspect the <code>Message</code> objects.
|
||
For example, the following <code>Message</code> data could be the output from a <strong>Chat Input</strong> component:</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">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> "messages": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> "message": "What's the recommended way to install Docker on Mac M1?",</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> "sender": "User",</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> "sender_name": "User",</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> "session_id": "Session Apr 21, 17:37:04",</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> "stream_url": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> "component_id": "ChatInput-4WKag",</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> "files": [],</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> "type": "text"</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->12</span><div style="display:inline-block;margin-left:16px"><span> ],</span></div></div><br></code></div></div>
|
||
<p>In the case of Input/Output components, the original input might not be structured as a <code>Message</code> object.
|
||
For example, a <strong>Language Model</strong> component might pass a raw text response to a <strong>Chat Output</strong> component that is then transformed into a <code>Message</code> object.</p>
|
||
<p>You can find <code>.log</code> files for flows at your Langflow installation's log storage location.
|
||
For filepaths, see <a href="#log-storage">Log storage</a>.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="view-chat-logs">View chat logs<a href="#view-chat-logs" class="hash-link" aria-label="Direct link to View chat logs" title="Direct link to View chat logs"></a></h3>
|
||
<p>In the <strong>Playground</strong>, you can inspect the chat history for each chat session.
|
||
For more information, see <a href="/concepts-playground#view-chat-history">View chat history</a>.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="view-output-from-a-single-component">View output from a single component<a href="#view-output-from-a-single-component" class="hash-link" aria-label="Direct link to View output from a single component" title="Direct link to View output from a single component"></a></h3>
|
||
<p>When debugging issues with the format or content of a flow's output, it can help to inspect each component's output to determine where data is being lost or malformed.</p>
|
||
<p>To view the output produced by a single component during the most recent run, click <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-text-search" aria-hidden="true"><path d="M21 6H3"></path><path d="M10 12H3"></path><path d="M10 18H3"></path><circle cx="17" cy="15" r="3"></circle><path d="m21 19-1.9-1.9"></path></svg> <strong>Inspect output</strong> on the component in the visual editor.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="desktop-logs">Access Langflow Desktop logs<a href="#desktop-logs" class="hash-link" aria-label="Direct link to Access Langflow Desktop logs" title="Direct link to Access Langflow Desktop logs"></a></h2>
|
||
<p>If you encounter issues with Langflow Desktop, you might need to access startup logs for debugging.
|
||
Follow the steps for your operating system.</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">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"><ol>
|
||
<li>
|
||
<p>Open Terminal 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 ~/Library/Logs/com.Langflow</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li>
|
||
<p>To open the folder and view the log files, run the 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>open .</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li>
|
||
<p>Locate the <code>langflow.log</code> file.</p>
|
||
</li>
|
||
</ol></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><ol>
|
||
<li>
|
||
<p>Open the Command Prompt (CMD), and then run 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>cd %LOCALAPPDATA%\com.langflow\logs</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li>
|
||
<p>To open the folder and view the log files, run the 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>start .</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li>
|
||
<p>Locate the <code>langflow.log</code> file.</p>
|
||
</li>
|
||
</ol></div></div></div>
|
||
<p>You can use the log file to investigate the issue on your own, add context to a <a href="/contributing-github-issues">GitHub Issue</a>, or send it to <a href="/luna-for-langflow">support</a> for debugging assistance.</p>
|
||
<p>The log file is only created when Langflow Desktop runs. If you don't see a log file, try starting Langflow Desktop first, then check for the log file.</p>
|
||
<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="/memory">Memory management options</a></li>
|
||
<li><a href="/configuration-custom-database">Configure an external PostgreSQL database</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="/enterprise-database-guide"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Database guide for enterprise administrators</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/integrations-arize"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Arize</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="#log-storage" class="table-of-contents__link toc-highlight">Log storage</a></li><li><a href="#configure-log-options" class="table-of-contents__link toc-highlight">Configure log options</a></li><li><a href="#flow-and-component-logs" class="table-of-contents__link toc-highlight">Flow and component logs</a><ul><li><a href="#view-flow-logs" class="table-of-contents__link toc-highlight">View flow logs</a></li><li><a href="#view-chat-logs" class="table-of-contents__link toc-highlight">View chat logs</a></li><li><a href="#view-output-from-a-single-component" class="table-of-contents__link toc-highlight">View output from a single component</a></li></ul></li><li><a href="#desktop-logs" class="table-of-contents__link toc-highlight">Access Langflow Desktop logs</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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