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<title data-rh="true">Use session ID to manage communication between components | Langflow Documentation</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://docs.langflow.org/session-id"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Use session ID to manage communication between components | Langflow Documentation"><meta data-rh="true" name="description" content="Session ID is a unique identifier for client/server connections. A single session equals the duration of a client's connection to a server."><meta data-rh="true" property="og:description" content="Session ID is a unique identifier for client/server connections. A single session equals the duration of a client's connection to a server."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://docs.langflow.org/session-id"><link data-rh="true" rel="alternate" href="https://docs.langflow.org/session-id" hreflang="en"><link data-rh="true" rel="alternate" href="https://docs.langflow.org/session-id" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://UZK6BDPCVY-dsn.algolia.net" crossorigin="anonymous"><link rel="preconnect" href="https://www.google-analytics.com">
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<p>Session ID is a unique identifier for client/server connections. A single session equals the duration of a client's connection to a server.</p>
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<p>In the Langflow <strong>Playground</strong>, current sessions are listed on the left side of the pane.</p>
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<p>Langflow uses session IDs to track different chat interactions within flows. This allows multiple chat sessions to exist in a single flow. Messages are stored in the database with session IDs as a reference.</p>
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<p>This differentiation between users per session is helpful in managing client/server connections, but is also important in maintaining separate conversational contexts within a single flow. LLMs rely on past interactions to generate responses to queries, and if these conversations aren't separated, the responses becomes less useful, or even confused.</p>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="customize-session-id">Customize session ID<a href="#customize-session-id" class="hash-link" aria-label="Direct link to Customize session ID" title="Direct link to Customize session ID"></a></h2>
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<p>Custom session IDs can be set as part of the payload in API calls, or as advanced settings in individual components. The API session ID value takes precedence. If no session ID is specified, the flow ID is assigned.</p>
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<p>If you set a custom session ID in a payload, all downstream components use the upstream component's session ID value.</p>
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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>curl --request POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> --url 'http://127.0.0.1:7860/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> --header '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> --data '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input_value": "Hello",</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> "input_type": "chat",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "session_id": "my_custom_session_value"</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>
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<p>The <code>my_custom_session_value</code> value is used in components that accept it, and the stored messages from this flow are stored in <code>langflow.db</code> with their respective <code>session_id</code> values.</p>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="retrieval-of-messages-from-memory-by-session-id">Retrieval of messages from memory by session ID<a href="#retrieval-of-messages-from-memory-by-session-id" class="hash-link" aria-label="Direct link to Retrieval of messages from memory by session ID" title="Direct link to Retrieval of messages from memory by session ID"></a></h2>
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<p>Add a <a href="/components-helpers#message-store">Message store</a> component to a flow to access the default <code>langflow.db</code> database. The component accepts <code>sessionID</code> as a filter parameter, and uses the session ID value from upstream automatically to retrieve message history by session ID from storage.</p>
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<p>Messages can be retrieved by <code>session_id</code> from the <code>/monitor</code> endpoint in the API. For more information, see the <a href="https://docs.langflow.org/api-reference-api-examples#get-messages" target="_blank" rel="noopener noreferrer">API examples</a>.</p>
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<p>For an example of session ID in action, see <a href="https://www.youtube.com/watch?v=nJiF_eF21MY" target="_blank" rel="noopener noreferrer">Use Session IDs in Langflow</a>.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/memory"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Memory management options</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/logging"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Logging options in Langflow</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="#customize-session-id" class="table-of-contents__link toc-highlight">Customize session ID</a></li><li><a href="#retrieval-of-messages-from-memory-by-session-id" class="table-of-contents__link toc-highlight">Retrieval of messages from memory by session ID</a></li></ul></div></div></div></div></main></div></div></div><div style="position:fixed;right:20px;bottom:20px;z-index:100;display:flex;align-items:center;gap:10px;cursor:pointer"><div style="background-color:#f6f6f6;border-radius:50%;width:48px;height:48px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 4px rgba(0,0,0,0.1)"><img src="/img/langflow-icon-black-transparent.svg" style="width:40px" alt="Search"></div></div></div>
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