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<p>Langflow's <strong>Playground</strong> is a dynamic interface you can use to test your LLM-based flows in real-time.</p>
|
||
<p>You can test how a flow responds to different inputs, review and modify memories, and monitor flow output and logic.
|
||
For example, you can make sure agent flows use the appropriate tools to respond to different inputs.</p>
|
||
<p>The <strong>Playground</strong> allows you to quickly iterate over your flow's logic and behavior, making it easier to prototype and refine your applications.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="run-a-flow-in-the-playground">Run a flow in the Playground<a href="#run-a-flow-in-the-playground" class="hash-link" aria-label="Direct link to Run a flow in the Playground" title="Direct link to Run a flow in the Playground"></a></h2>
|
||
<p>To run a flow in the <strong>Playground</strong>, open the flow, and then 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-play" aria-hidden="true"><polygon points="6 3 20 12 6 21 6 3"></polygon></svg> <strong>Playground</strong>.
|
||
Then, if your flow has a <a href="/components-io"><strong>Chat Input</strong> component</a>, enter a prompt or <a href="/concepts-voice-mode">use voice mode</a> to trigger the flow and start a chat session.</p>
|
||
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>If there is no message input field in the <strong>Playground</strong>, make sure your flow has a <strong>Chat Input</strong> component that is connected, directly or indirectly, to the <strong>Input</strong> port of a <strong>Language Model</strong> or <strong>Agent</strong> component.</p><p>Because the <strong>Playground</strong> is designed for flows that use an LLM in a query-and-response format, such as chatbots and agents, a flow must have <strong>Chat Input</strong>, <strong>Language Model</strong>/<strong>Agent</strong>, and <strong>Chat Output</strong> components to be fully supported by the <strong>Playground</strong> chat interface</p><p>For flows that require another type of input, such as a webhook event, file upload, or text input, you can <a href="/api-flows-run">use the Langflow API to trigger the flow</a>, and then open the <strong>Playground</strong> to review the LLM activity for the flow run, if applicable.</p></div></div>
|
||
<p><img decoding="async" loading="lazy" alt="Playground window" src="/assets/images/playground-f076ef0d964c1c159da751ec119fa744.png" width="4000" height="2182" class="img_ev3q"></p>
|
||
<p>For technical details about how the <strong>Playground</strong> works, see <a href="/api-monitor">Monitor endpoints</a>.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="review-agent-logic">Review agent logic<a href="#review-agent-logic" class="hash-link" aria-label="Direct link to Review agent logic" title="Direct link to Review agent logic"></a></h3>
|
||
<p>If your flow has an <strong>Agent</strong> component, the <strong>Playground</strong> prints the tools used by the agent and the output from each tool.
|
||
This helps you monitor the agent's tool use and understand the logic behind the agent's responses.
|
||
For example, the following agent used a connected <code>fetch_content</code> tool to perform a web search:</p>
|
||
<p><img decoding="async" loading="lazy" alt="Playground with agent response" src="/assets/images/playground-with-agent-423894429e02da778dc975dd1680436c.png" width="2864" height="1856" class="img_ev3q"></p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="view-chat-history">View chat history<a href="#view-chat-history" class="hash-link" aria-label="Direct link to View chat history" title="Direct link to View chat history"></a></h3>
|
||
<p>In the <strong>Playground</strong>, you can view message logs for each of your flow's chat sessions, including timestamps, content, and senders.</p>
|
||
<p>In the <strong>Playground</strong> sidebar, find the chat session you want to review, 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-ellipsis" aria-hidden="true"><circle cx="12" cy="12" r="1"></circle><circle cx="19" cy="12" r="1"></circle><circle cx="5" cy="12" r="1"></circle></svg> <strong>Options</strong>, and then select <strong>Message Logs</strong>.</p>
|
||
<p><img decoding="async" loading="lazy" alt="Playground logs" src="/assets/images/messages-logs-0253cad77c1fb946dc1e2f0fe239261f.png" width="4000" height="2182" class="img_ev3q"></p>
|
||
<p>Message logs break apart the <a href="/data-types#message"><code>Message</code> data</a> for each chat message.
|
||
Click any cell in the message logs to view the full contents of that cell.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="modify-memories-in-the-playground">Modify memories in the Playground<a href="#modify-memories-in-the-playground" class="hash-link" aria-label="Direct link to Modify memories in the Playground" title="Direct link to Modify memories in the Playground"></a></h3>
|
||
<p>To help debug and test your flows, you can edit or delete individual messages in <a href="#view-chat-history">message logs</a>.
|
||
For example, you might want to delete messages that you sent while testing a component that is no longer part of your flow.</p>
|
||
<p>You can also delete entire chat sessions from the sidebar: 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-ellipsis" aria-hidden="true"><circle cx="12" cy="12" r="1"></circle><circle cx="19" cy="12" r="1"></circle><circle cx="5" cy="12" r="1"></circle></svg> <strong>Options</strong>, and then select <strong>Delete</strong>.</p>
|
||
<p>Modifying memories influences the behavior of the chatbot responses if you continue the chat session or if you preserve memories over multiple chat sessions.</p>
|
||
<p><strong>Editing message logs edits Langflow's internal <code>messages</code> table, which is the default chat memory storage.</strong>
|
||
For more information about managing sessions and chat memory in Langflow, see <a href="#session-ids">Use custom session IDs</a> and <a href="/memory">Memory management options</a>.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="session-ids">Set custom session IDs<a href="#session-ids" class="hash-link" aria-label="Direct link to Set custom session IDs" title="Direct link to Set custom session IDs"></a></h2>
|
||
<p>Chat sessions are identified by session ID (<code>session_id</code>), which is a unique identifier for a flow run.</p>
|
||
<p>The default session ID is the flow ID, which means that all chat messages for a flow are stored under the same session ID as one enormous chat session.</p>
|
||
<p>If you need to preserve chat context over multiple flow runs or differentiate chat sessions when debugging flows, you can set a custom <code>session_id</code>.</p>
|
||
<p>Custom session IDs are helpful for multiple reasons:</p>
|
||
<ul>
|
||
<li>Separate chat sessions in situations where one flow has multiple chat sessions, such as a chatbot that can have multiple simultaneous user interactions.</li>
|
||
<li>Preserve memory when continuing a chat session across multiple flow runs or when passing context from one flow to another.</li>
|
||
<li>Differentiate activity from multiple users within the same flow.</li>
|
||
<li>Identify your own chat sessions when debugging and testing flows.</li>
|
||
</ul>
|
||
<p>You can set custom session IDs in the visual editor and programmatically.</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">Visual editor</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Langflow API</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><p>In your <a href="/components-io"><strong>Input and Output</strong> components</a>, use the <strong>Session ID</strong> field:</p><ol>
|
||
<li>Click the component where you want to set a custom session ID.</li>
|
||
<li>In the <a href="/concepts-components#component-menus">component's header menu</a>, 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-sliders-horizontal" aria-hidden="true"><line x1="21" x2="14" y1="4" y2="4"></line><line x1="10" x2="3" y1="4" y2="4"></line><line x1="21" x2="12" y1="12" y2="12"></line><line x1="8" x2="3" y1="12" y2="12"></line><line x1="21" x2="16" y1="20" y2="20"></line><line x1="12" x2="3" y1="20" y2="20"></line><line x1="14" x2="14" y1="2" y2="6"></line><line x1="8" x2="8" y1="10" y2="14"></line><line x1="16" x2="16" y1="18" y2="22"></line></svg> <strong>Controls</strong>.</li>
|
||
<li>Enable <strong>Session ID</strong>.</li>
|
||
<li>Click <strong>Close</strong>.</li>
|
||
<li>Enter a custom session ID.
|
||
If the field is empty, the flow uses the default session ID.</li>
|
||
<li>Open the <strong>Playground</strong> to start a chat under your custom session ID.</li>
|
||
</ol><p>Make sure to change the <strong>Session ID</strong> when you want to start a new chat session or continue an earlier chat session with a different session ID.</p></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><p>When you trigger a flow with the Langflow API, include the <code>session_id</code> parameter in the request payload.
|
||
For example:</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>curl -X POST "http://$LANGFLOW_SERVER_ADDRESS/api/v1/run/$FLOW_ID" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>-H "Content-Type: application/json" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>-H "x-api-key: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>-d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "session_id": "CUSTOM_SESSION_ID",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input_value": "message",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input_type": "chat",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "output_type": "chat"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>}'</span></div></div><br></code></div></div><p>This command starts a new chat sessions with the specified <code>session_id</code> or it retrieves an existing session with that ID, if one exists.</p></div></div></div>
|
||
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>In a production environment, consider using a variable for the session ID rather than a hardcoded value.</p><p>For example, if you want to preserve context for authenticated users, user ID could be a useful variable for the session ID.
|
||
Alternatively, if you want every chat to be unique, you might want to automatically generate a UUID for each session ID.</p></div></div>
|
||
<p>For more information, see <a href="/session-id">Use session ID to manage communication between components</a>.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="share-a-flows-playground">Share a flow's Playground<a href="#share-a-flows-playground" class="hash-link" aria-label="Direct link to Share a flow's Playground" title="Direct link to Share a flow's Playground"></a></h2>
|
||
<div class="theme-admonition theme-admonition-important admonition_xJq3 alert alert--info"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>important</div><div class="admonitionContent_BuS1"><p>The <strong>Shareable Playground</strong> is for testing purposes only.
|
||
The <strong>Playground</strong> isn't meant for embedding flows in applications. For information about running flows in applications or websites, see <a href="/concepts-publish">Trigger flows with the Langflow API</a>.</p><p>The <strong>Shareable Playground</strong> isn't available in Langflow Desktop.</p></div></div>
|
||
<p>The <strong>Shareable Playground</strong> option exposes the <strong>Playground</strong> for a single flow at the <code>/public_flow/$FLOW_ID</code> endpoint.</p>
|
||
<p>After you <a href="/deployment-overview">deploy a public Langflow server</a>, you can share this public URL with another user to allow them to access the specified flow's <strong>Playground</strong> only.
|
||
The user can interact with the flow's chat input and output and view the results without installing Langflow or generating a Langflow API key.</p>
|
||
<p>To share a flow's <strong>Playground</strong> with another user, do the following:</p>
|
||
<ol>
|
||
<li>In Langflow, open the flow you want share.</li>
|
||
<li>In the <a href="/concepts-overview#workspace">workspace</a>, click <strong>Share</strong>, and then enable <strong>Shareable Playground</strong>.</li>
|
||
<li>Click <strong>Shareable Playground</strong> again to open the <strong>Playground</strong> window.
|
||
This window's URL is the flow's <strong>Shareable Playground</strong> address, such as <code>https://3f7c-73-64-93-151.ngrok-free.app/playground/d764c4b8-5cec-4c0f-9de0-4b419b11901a</code>.</li>
|
||
<li>Send the URL to another user to give them access to the flow's <strong>Playground</strong>.</li>
|
||
</ol>
|
||
<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="/concepts-file-management#upload-images">Upload images</a></li>
|
||
<li><a href="/concepts-voice-mode">Use voice mode</a></li>
|
||
<li><a href="/concepts-publish">Trigger flows with the Langflow API</a></li>
|
||
<li><a href="/session-id">Session ID</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="/webhook"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Trigger flows with webhooks</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/concepts-flows-import"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Import and export flows</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="#run-a-flow-in-the-playground" class="table-of-contents__link toc-highlight">Run a flow in the Playground</a><ul><li><a href="#review-agent-logic" class="table-of-contents__link toc-highlight">Review agent logic</a></li><li><a href="#view-chat-history" class="table-of-contents__link toc-highlight">View chat history</a></li><li><a href="#modify-memories-in-the-playground" class="table-of-contents__link toc-highlight">Modify memories in the Playground</a></li></ul></li><li><a href="#session-ids" class="table-of-contents__link toc-highlight">Set custom session IDs</a></li><li><a href="#share-a-flows-playground" class="table-of-contents__link toc-highlight">Share a flow's Playground</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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