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<div class="theme-admonition theme-admonition-info 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>info</div><div class="admonitionContent_BuS1"><p>The <code>/build</code> endpoints are used by Langflow's frontend visual editor code.
|
||
These endpoints are part of the internal Langflow codebase.</p><p>Don't use these endpoints to run flows in applications that use your Langflow flows.
|
||
To run flows in your apps, see <a href="/api-flows-run">Flow trigger endpoints</a>.</p></div></div>
|
||
<p>The <code>/build</code> endpoints support Langflow's frontend code for building flows in the Langflow visual editor.
|
||
You can use these endpoints to build vertices and flows, as well as execute flows with streaming event responses.
|
||
You might need to use or understand these endpoints when contributing to the Langflow codebase.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="build-flow-and-stream-events">Build flow and stream events<a href="#build-flow-and-stream-events" class="hash-link" aria-label="Direct link to Build flow and stream events" title="Direct link to Build flow and stream events"></a></h2>
|
||
<p>This endpoint builds and executes a flow, returning a job ID that can be used to stream execution events.</p>
|
||
<ol>
|
||
<li>
|
||
<p>Send a POST request to the <code>/build/$FLOW_ID/flow</code> endpoint:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "$LANGFLOW_URL/api/v1/build/$FLOW_ID/flow" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "accept: application/json" \</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: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "inputs": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input_value": "Tell me a story"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> }'</span></div></div><br></code></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Result</summary><div><div class="collapsibleContent_i85q"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "job_id": "123e4567-e89b-12d3-a456-426614174000"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div></div></details>
|
||
</li>
|
||
<li>
|
||
<p>After receiving a job ID from the build endpoint, use the <code>/build/$JOB_ID/events</code> endpoint to stream the execution results:</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 GET \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "$LANGFLOW_URL/api/v1/build/123e4567-e89b-12d3-a456-426614174000/events" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "accept: 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><br></code></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Result</summary><div><div class="collapsibleContent_i85q"><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>{"event": "vertices_sorted", "data": {"ids": ["ChatInput-XtBLx"], "to_run": ["Prompt-x74Ze", "ChatOutput-ylMzN", "ChatInput-XtBLx", "OpenAIModel-d1wOZ"]}}</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>{"event": "add_message", "data": {"timestamp": "2025-03-03T17:42:23", "sender": "User", "sender_name": "User", "session_id": "d2bbd92b-187e-4c84-b2d4-5df365704201", "text": "Tell me a story", "files": [], "error": false, "edit": false, "properties": {"text_color": "", "background_color": "", "edited": false, "source": {"id": null, "display_name": null, "source": null}, "icon": "", "allow_markdown": false, "positive_feedback": null, "state": "complete", "targets": []}, "category": "message", "content_blocks": [], "id": "28879bd8-6a68-4dd5-b658-74d643a4dd92", "flow_id": "d2bbd92b-187e-4c84-b2d4-5df365704201"}}</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>// ... Additional events as the flow executes ...</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>{"event": "end", "data": {}}</span></div></div><br></code></div></div></div></div></details>
|
||
</li>
|
||
</ol>
|
||
<p>The <code>/build/$FLOW_ID/events</code> endpoint has a <code>stream</code> query parameter that defaults to <code>true</code>.
|
||
To disable streaming and get all events at once, set <code>?stream=false</code>.</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 GET \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "$LANGFLOW_URL/api/v1/build/123e4567-e89b-12d3-a456-426614174000/events?stream=false" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "accept: 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><br></code></div></div>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="build-headers">Build headers<a href="#build-headers" class="hash-link" aria-label="Direct link to Build headers" title="Direct link to Build headers"></a></h2>
|
||
<table><thead><tr><th>Header</th><th>Info</th><th>Example</th></tr></thead><tbody><tr><td>Content-Type</td><td>Required. Specifies the JSON format.</td><td>"application/json"</td></tr><tr><td>accept</td><td>Optional. Specifies the response format.</td><td>"application/json"</td></tr><tr><td>x-api-key</td><td>Optional. Required only if authentication is enabled.</td><td>"sk-..."</td></tr></tbody></table>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="build-parameters">Build parameters<a href="#build-parameters" class="hash-link" aria-label="Direct link to Build parameters" title="Direct link to Build parameters"></a></h2>
|
||
<table><thead><tr><th>Parameter</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>inputs</td><td>object</td><td>Optional. Input values for flow components.</td></tr><tr><td>data</td><td>object</td><td>Optional. Flow data to override stored configuration.</td></tr><tr><td>files</td><td>array[string]</td><td>Optional. List of file paths to use.</td></tr><tr><td>start_component_id</td><td>string</td><td>Optional. ID of the component where the execution should start. Component <code>id</code> values can be found in <a href="/concepts-flows-import#langflow-json-file-contents">Langflow JSON files</a></td></tr><tr><td>stop_component_id</td><td>string</td><td>Optional. ID of the component where the execution should stop. Component <code>id</code> values can be found in <a href="/concepts-flows-import#langflow-json-file-contents">Langflow JSON files</a>.</td></tr><tr><td>log_builds</td><td>Boolean</td><td>Whether to record build logs. Default: Enabled (<code>true</code>).</td></tr></tbody></table>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="set-start-and-stop-points">Set start and stop points<a href="#set-start-and-stop-points" class="hash-link" aria-label="Direct link to Set start and stop points" title="Direct link to Set start and stop points"></a></h3>
|
||
<p>The <code>/build</code> endpoint accepts optional values for <code>start_component_id</code> and <code>stop_component_id</code> to control where the flow run starts and stops.
|
||
Setting <code>stop_component_id</code> for a component triggers the same behavior as clicking <strong>Run component</strong> on that component in the visual editor: The specified component and all dependent components leading up to that component will run.</p>
|
||
<p>The following example stops flow execution at an <strong>OpenAI</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">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "$LANGFLOW_URL/api/v1/build/$FLOW_ID/flow" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "accept: application/json" \</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: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -d '{"stop_component_id": "OpenAIModel-Uksag"}'</span></div></div><br></code></div></div>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="override-flow-parameters">Override flow parameters<a href="#override-flow-parameters" class="hash-link" aria-label="Direct link to Override flow parameters" title="Direct link to Override flow parameters"></a></h3>
|
||
<p>The <code>/build</code> endpoint also accepts inputs for <code>data</code> directly, instead of using the values stored in the Langflow database.
|
||
This is useful for running flows without having to pass custom values through the visual editor.</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> "$LANGFLOW_URL/api/v1/build/$FLOW_ID/flow" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> -H "accept: application/json" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</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">_<!-- -->15</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">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> -d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> "data": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> "nodes": [],</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> "edges": []</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> },</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> "inputs": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> "input_value": "Your custom input here",</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> "session": "session_id"</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->15</span><div style="display:inline-block;margin-left:16px"><span> }'</span></div></div><br></code></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Result</summary><div><div class="collapsibleContent_i85q"><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>{ "job_id": "0bcc7f23-40b4-4bfa-9b8a-a44181fd1175" }</span></div></div><br></code></div></div></div></div></details>
|
||
<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="/api-monitor#get-vertex-builds">Get Vertex builds</a></li>
|
||
<li><a href="/api-monitor#delete-vertex-builds">Delete Vertex builds</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="/api-monitor"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Monitor endpoints</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/api-users"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Users endpoints</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="#build-flow-and-stream-events" class="table-of-contents__link toc-highlight">Build flow and stream events</a></li><li><a href="#build-headers" class="table-of-contents__link toc-highlight">Build headers</a></li><li><a href="#build-parameters" class="table-of-contents__link toc-highlight">Build parameters</a><ul><li><a href="#set-start-and-stop-points" class="table-of-contents__link toc-highlight">Set start and stop points</a></li><li><a href="#override-flow-parameters" class="table-of-contents__link toc-highlight">Override flow parameters</a></li></ul></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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