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|
||
<span class="sidebar-ad-text sidebar-ad-text-gradient">Download Langflow Desktop</span>
|
||
</div>
|
||
</a>
|
||
</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_z5aJ"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is unreleased documentation for <!-- -->Langflow Documentation<!-- --> <b>1.10.x (Next)</b> version.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/logging">latest version</a></b> (<!-- -->1.9.x<!-- -->).</div></div><div class="docItemContainer_c0TR"><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" aria-hidden="true" focusable="false" role="presentation" class="breadcrumbHomeIcon_xK9p"><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="docMetaRow_c2hx"><div class="root_Eutc"><button type="button" class="button_gpNY"><span aria-hidden="true" class="icon_Bm9L"><svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-copy"><rect width="14" height="14" x="8" y="8" rx="2" ry="2"></rect><path d="M4 16c-1.1 0-2-.9-2-2V4c0-1.1.9-2 2-2h10c1.1 0 2 .9 2 2"></path></svg></span><span class="label_LzDG">Copy page</span></button></div><span class="theme-doc-version-badge badge badge--secondary">Version: 1.10.x (Next)</span></div><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>Langflow produces logs for individual flows and the Langflow application itself using the <a href="https://www.structlog.org" target="_blank" rel="noopener noreferrer" class="">structlog</a> library for logging.</p>
|
||
<p>The default, primary logfile is named <code>langflow.log</code>.</p>
|
||
<p>Log files are stored in JSON format with structured metadata.</p>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" 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" translate="no"></a></h2>
|
||
<p>Langflow logs are stored in the config directory specified in the <code>LANGFLOW_CONFIG_DIR</code> environment variable.
|
||
The default config directory location depends on your operating system and installation method:</p>
|
||
<ul>
|
||
<li class="">
|
||
<p><strong>Langflow Desktop</strong>:</p>
|
||
<ul>
|
||
<li class=""><strong>macOS</strong>: <code>/Users/<username>/Library/Logs/com.LangflowDesktop</code></li>
|
||
<li class=""><strong>Windows</strong>: <code>C:\Users\<username>\AppData\Local\com.LangflowDesktop\logs</code></li>
|
||
</ul>
|
||
</li>
|
||
<li class="">
|
||
<p><strong>OSS Langflow</strong>:</p>
|
||
<ul>
|
||
<li class=""><strong>macOS with <code>uv pip install</code></strong>: <code>/Users/<username>/Library/Caches/langflow</code></li>
|
||
<li class=""><strong>Linux with <code>uv pip install</code></strong>: <code>/home/<username>/.cache/langflow</code></li>
|
||
<li class=""><strong>Windows/WSL with <code>uv pip install</code></strong>: <code>C:\Users\<username>\AppData\Local\langflow\langflow\Cache</code></li>
|
||
<li class=""><strong>macOS/Windows/Linux/WSL with <code>git clone</code></strong>: <code><path_to_clone>/src/backend/base/langflow/</code></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<p>To customize log storage locations and behaviors, set the following <a class="" href="/environment-variables">Langflow environment variables</a> in your Langflow <code>.env</code> file, and then start Langflow with <code>uv run langflow run --env-file .env</code>:</p>
|
||
<table><thead><tr><th>Variable</th><th>Format</th><th>Default</th><th>Description</th></tr></thead><tbody><tr><td><code>LANGFLOW_CONFIG_DIR</code></td><td>String</td><td>Varies</td><td>Set the Langflow configuration directory where files and logs are stored. Default path depends on your installation, as described in the preceding list.</td></tr><tr><td><code>LANGFLOW_LOG_LEVEL</code></td><td>String</td><td><code>ERROR</code></td><td>Sets the log level as one of <code>DEBUG</code>, <code>ERROR</code>, <code>INFO</code>, <code>WARNING</code>, and <code>CRITICAL</code>. For example, <code>LANGFLOW_LOG_LEVEL=DEBUG</code>.</td></tr><tr><td><code>LANGFLOW_LOG_FILE</code></td><td>String</td><td>Not set</td><td>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>. If not set, logs are written to stdout.</td></tr><tr><td><code>LANGFLOW_LOG_ENV</code></td><td>String</td><td><code>default</code></td><td>This variable is the primary log format controller. <code>container</code>: JSON format for Docker/structured logging. <code>container_csv</code>: Key-value format for data analysis. <code>default</code> or unset: Uses <code>LANGFLOW_PRETTY_LOGS</code> to determine format.</td></tr><tr><td><code>LANGFLOW_PRETTY_LOGS</code></td><td>Boolean</td><td><code>True</code></td><td>This variable controls log output format when <code>LANGFLOW_LOG_ENV=default</code> or unset. When <code>true</code>, uses structlog's <a href="https://www.structlog.org/en/stable/console-output.html" target="_blank" rel="noopener noreferrer" class="">ConsoleRenderer</a>. When <code>false</code>, outputs logs in JSON format.</td></tr><tr><td><code>LANGFLOW_LOG_FORMAT</code></td><td>String</td><td>Not set</td><td>Switch between key-value format and console format. Set to <code>key_value</code> for key-value format or <code>console</code> to use structlog's <a href="https://www.structlog.org/en/stable/console-output.html" target="_blank" rel="noopener noreferrer" class="">ConsoleRenderer</a>. This variable only works when <code>LANGFLOW_LOG_ENV=default</code> and <code>LANGFLOW_PRETTY_LOGS=true</code>.</td></tr><tr><td><code>LANGFLOW_LOG_ROTATION</code></td><td>String</td><td><code>1 day</code></td><td>Controls when the log file is rotated, either based on time or file size. For time-based rotation, set to <code>1 day</code>, <code>12 hours</code>, or <code>1 week</code>. For size-based rotation, set to <code>10 MB</code> or <code>1 GB</code>. To disable rotation, set to <code>None</code>. If disabled, log files grow without limit.</td></tr><tr><td><code>LANGFLOW_ENABLE_LOG_RETRIEVAL</code></td><td>Boolean</td><td><code>False</code></td><td>Enables retrieval of logs from your Langflow instance with <a class="" href="/api-logs">Logs endpoints</a>.</td></tr><tr><td><code>LANGFLOW_LOG_RETRIEVER_BUFFER_SIZE</code></td><td>Integer</td><td><code>10000</code></td><td>Set the buffer size for log retrieval if <code>LANGFLOW_ENABLE_LOG_RETRIEVAL=True</code>. Must be greater than <code>0</code> for log retrieval to function.</td></tr><tr><td><code>LANGFLOW_NATIVE_TRACING</code></td><td>Boolean</td><td><code>true</code></td><td>Enables the tracer to record execution traces directly in the Langflow database for use in Trace View. Set to <code>false</code> to disable tracing.</td></tr></tbody></table>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="view-logs-in-real-time">View logs in real-time<a href="#view-logs-in-real-time" class="hash-link" aria-label="Direct link to View logs in real-time" title="Direct link to View logs in real-time" translate="no"></a></h2>
|
||
<p>To monitor Langflow logs as they are generated, you can follow the log file:</p>
|
||
<ol>
|
||
<li class="">
|
||
<p>Change to your <a href="#log-storage" class="">Langflow config directory</a>:</p>
|
||
<div class="theme-tabs-container 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"><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 /Users/**USERNAME**/Library/Caches/langflow</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>cd C:\Users\**USERNAME**\AppData\Local\com.LangflowDesktop\logs</span></div></div><br></code></div></div></div></div></div>
|
||
</li>
|
||
<li class="">
|
||
<p>Tail the main log file:</p>
|
||
<div class="theme-tabs-container 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"><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>tail -f langflow.log</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>Get-Content -Wait -Path langflow.log</span></div></div><br></code></div></div></div></div></div>
|
||
<p>If you don't see new log entries, check that Langflow is running, and perform some actions to generate logs events. You can also check the terminal where you started Langflow to see if logs are being printed there.</p>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" 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" translate="no"></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 class="" href="/chat-input-and-output">Input and Output components</a>.</p>
|
||
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" 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" translate="no"></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 language model component can 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" class="">Log storage</a>.</p>
|
||
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" 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" translate="no"></a></h3>
|
||
<p>In the <strong>Playground</strong>, you can inspect the chat history for each chat session.
|
||
For more information, see <a class="" href="/concepts-playground#view-chat-history">View chat history</a>.</p>
|
||
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" 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" translate="no"></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="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-text-search lf-inline-icon" aria-hidden="true" focusable="false" role="presentation"><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 anchorTargetStickyNavbar_Vzrq" 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" translate="no"></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="theme-tabs-container 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 class="">
|
||
<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.LangflowDesktop</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li class="">
|
||
<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 class="">
|
||
<p>Locate the <code>langflow.log</code> file.</p>
|
||
</li>
|
||
</ol></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><ol>
|
||
<li class="">
|
||
<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.LangflowDesktop\cache</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li class="">
|
||
<p>Open the folder and view the log files:</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 class="">
|
||
<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 class="" href="/contributing-github-issues">GitHub Issue</a>, or send it to <a class="" 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 anchorTargetStickyNavbar_Vzrq" 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" translate="no"></a></h2>
|
||
<ul>
|
||
<li class=""><a class="" href="/api-logs">Logs endpoints</a></li>
|
||
<li class=""><a class="" href="/memory">Memory management options</a></li>
|
||
<li class=""><a class="" href="/configuration-custom-database">Configure an external PostgreSQL database</a></li>
|
||
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