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<header><h1>Logic components in Langflow</h1></header>
<p>Logic components provide functionalities for routing, conditional processing, and flow management.</p>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="use-a-logic-component-in-a-flow">Use a logic component in a flow<a href="#use-a-logic-component-in-a-flow" class="hash-link" aria-label="Direct link to Use a logic component in a flow" title="Direct link to Use a logic component in a flow">​</a></h2>
<p>This flow creates a summarizing &quot;for each&quot; loop with the <a href="/components-logic#loop">Loop</a> component.</p>
<p>The component iterates over a list of <a href="/concepts-objects#data-object">Data</a> objects until it&#x27;s completed, and then the <strong>Done</strong> loop aggregates the results.</p>
<p>The <strong>File</strong> component loads text files from your local machine, and then the <strong>Parse Data</strong> component parses them into a list of structured <code>Data</code> objects.
The <strong>Loop</strong> component passes each <code>Data</code> object to a <strong>Prompt</strong> to be summarized.</p>
<p>When the <strong>Loop</strong> component runs out of <code>Data</code>, the <strong>Done</strong> loop activates, which counts the number of pages and summarizes their tone with another <strong>Prompt</strong>.
This is represented in Langflow by connecting the Parse Data component&#x27;s <strong>Data List</strong> output to the Loop component&#x27;s <code>Data</code> loop input.</p>
<p><img decoding="async" loading="lazy" alt="Sample Flow looping summarizer" src="/assets/images/loop-text-summarizer-bd1d7be6d26bb47765931e3ab9f98dfa.png" width="2676" height="1512" class="img_ev3q"></p>
<p>The output will look similar to this:</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>Document Summary</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>Total Pages Processed</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>Total Pages: 2</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>Overall Tone of Document</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>Tone: Informative and Instructional</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>The documentation outlines microservices architecture patterns and best practices.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>It emphasizes service isolation and inter-service communication protocols.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>The use of asynchronous messaging patterns is recommended for system scalability.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>It includes code examples of REST and gRPC implementations to demonstrate integration approaches.</span></div></div><br></code></div></div>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="conditional-router-if-else-component">Conditional router (If-Else component)<a href="#conditional-router-if-else-component" class="hash-link" aria-label="Direct link to Conditional router (If-Else component)" title="Direct link to Conditional router (If-Else component)">​</a></h2>
<p>This component routes an input message to a corresponding output based on text comparison.</p>
<p>The ConditionalRouterComponent routes messages based on text comparison. It evaluates a condition by comparing two text inputs using a specified operator and routes the message accordingly.</p>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="inputs">Inputs<a href="#inputs" class="hash-link" aria-label="Direct link to Inputs" title="Direct link to Inputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>input_text</td><td>String</td><td>The primary text input for the operation.</td></tr><tr><td>match_text</td><td>String</td><td>The text input to compare against.</td></tr><tr><td>operator</td><td>Dropdown</td><td>The operator to apply for comparing the texts.</td></tr><tr><td>case_sensitive</td><td>Boolean</td><td>If true, the comparison will be case sensitive.</td></tr><tr><td>message</td><td>Message</td><td>The message to pass through either route.</td></tr><tr><td>max_iterations</td><td>Integer</td><td>The maximum number of iterations for the conditional router.</td></tr><tr><td>default_route</td><td>Dropdown</td><td>The default route to take when max iterations are reached.</td></tr></tbody></table>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="outputs">Outputs<a href="#outputs" class="hash-link" aria-label="Direct link to Outputs" title="Direct link to Outputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>true_result</td><td>Message</td><td>The output when the condition is true.</td></tr><tr><td>false_result</td><td>Message</td><td>The output when the condition is false.</td></tr></tbody></table>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="data-conditional-router">Data conditional router<a href="#data-conditional-router" class="hash-link" aria-label="Direct link to Data conditional router" title="Direct link to Data conditional router">​</a></h2>
<p>This component routes <code>Data</code> objects based on a condition applied to a specified key, including boolean validation.</p>
<p>This component is particularly useful in workflows that require conditional routing of complex data structures, enabling dynamic decision-making based on data content.</p>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="inputs-1">Inputs<a href="#inputs-1" class="hash-link" aria-label="Direct link to Inputs" title="Direct link to Inputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>data_input</td><td>Data</td><td>The data object or list of data objects to process.</td></tr><tr><td>key_name</td><td>String</td><td>The name of the key in the data object to check.</td></tr><tr><td>operator</td><td>Dropdown</td><td>The operator to apply for comparing the values.</td></tr><tr><td>compare_value</td><td>String</td><td>The value to compare against (not used for boolean validator).</td></tr></tbody></table>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="outputs-1">Outputs<a href="#outputs-1" class="hash-link" aria-label="Direct link to Outputs" title="Direct link to Outputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>true_output</td><td>Data/List</td><td>Output when the condition is met.</td></tr><tr><td>false_output</td><td>Data/List</td><td>Output when the condition is not met.</td></tr></tbody></table>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="flow-as-tool">Flow as tool<a href="#flow-as-tool" class="hash-link" aria-label="Direct link to Flow as tool" title="Direct link to Flow as tool">​</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>This component is deprecated as of Langflow version 1.1.2.
Instead, use the <a href="/components-logic#run-flow">Run flow component</a></p></div></div>
<p>This component constructs a tool from a function that runs a loaded flow.</p>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="inputs-2">Inputs<a href="#inputs-2" class="hash-link" aria-label="Direct link to Inputs" title="Direct link to Inputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>flow_name</td><td>Dropdown</td><td>The name of the flow to run.</td></tr><tr><td>tool_name</td><td>String</td><td>The name of the tool.</td></tr><tr><td>tool_description</td><td>String</td><td>The description of the tool.</td></tr><tr><td>return_direct</td><td>Boolean</td><td>If true, returns the result directly from the tool.</td></tr></tbody></table>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="outputs-2">Outputs<a href="#outputs-2" class="hash-link" aria-label="Direct link to Outputs" title="Direct link to Outputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>api_build_tool</td><td>Tool</td><td>The constructed tool from the flow.</td></tr></tbody></table>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="listen">Listen<a href="#listen" class="hash-link" aria-label="Direct link to Listen" title="Direct link to Listen">​</a></h2>
<p>This component listens for a notification and retrieves its associated state.</p>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="inputs-3">Inputs<a href="#inputs-3" class="hash-link" aria-label="Direct link to Inputs" title="Direct link to Inputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>name</td><td>String</td><td>The name of the notification to listen for.</td></tr></tbody></table>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="outputs-3">Outputs<a href="#outputs-3" class="hash-link" aria-label="Direct link to Outputs" title="Direct link to Outputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>output</td><td>Data</td><td>The state associated with the notification.</td></tr></tbody></table>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="loop">Loop<a href="#loop" class="hash-link" aria-label="Direct link to Loop" title="Direct link to Loop">​</a></h2>
<p>This component iterates over a list of <a href="/concepts-objects#data-object">Data</a> objects, outputting one item at a time and aggregating results from loop inputs.</p>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="inputs-4">Inputs<a href="#inputs-4" class="hash-link" aria-label="Direct link to Inputs" title="Direct link to Inputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>data</td><td>Data/List</td><td>The initial list of Data objects to iterate over.</td></tr></tbody></table>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="outputs-4">Outputs<a href="#outputs-4" class="hash-link" aria-label="Direct link to Outputs" title="Direct link to Outputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>item</td><td>Data</td><td>Outputs one item at a time from the data list.</td></tr><tr><td>done</td><td>Data</td><td>Triggered when iteration complete, returns aggregated results.</td></tr></tbody></table>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="notify">Notify<a href="#notify" class="hash-link" aria-label="Direct link to Notify" title="Direct link to Notify">​</a></h2>
<p>This component generates a notification for the Listen component to use.</p>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="inputs-5">Inputs<a href="#inputs-5" class="hash-link" aria-label="Direct link to Inputs" title="Direct link to Inputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>name</td><td>String</td><td>The name of the notification.</td></tr><tr><td>data</td><td>Data</td><td>The data to store in the notification.</td></tr><tr><td>append</td><td>Boolean</td><td>If true, the record will be appended to the existing notification.</td></tr></tbody></table>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="outputs-5">Outputs<a href="#outputs-5" class="hash-link" aria-label="Direct link to Outputs" title="Direct link to Outputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>output</td><td>Data</td><td>The data stored in the notification.</td></tr></tbody></table>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="pass-message">Pass message<a href="#pass-message" class="hash-link" aria-label="Direct link to Pass message" title="Direct link to Pass message">​</a></h2>
<p>This component forwards the input message, unchanged.</p>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="inputs-6">Inputs<a href="#inputs-6" class="hash-link" aria-label="Direct link to Inputs" title="Direct link to Inputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Display Name</th><th>Info</th></tr></thead><tbody><tr><td>input_message</td><td>Input Message</td><td>The message to be passed forward.</td></tr><tr><td>ignored_message</td><td>Ignored Message</td><td>A second message to be ignored. Used as a workaround for continuity.</td></tr></tbody></table>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="outputs-6">Outputs<a href="#outputs-6" class="hash-link" aria-label="Direct link to Outputs" title="Direct link to Outputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Display Name</th><th>Info</th></tr></thead><tbody><tr><td>output_message</td><td>Output Message</td><td>The forwarded input message.</td></tr></tbody></table>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="run-flow">Run flow<a href="#run-flow" class="hash-link" aria-label="Direct link to Run flow" title="Direct link to Run flow">​</a></h2>
<p>This component allows you to run any flow stored in your Langflow database without opening the flow editor.</p>
<p>The Run Flow component can also be used as a tool when connected to an <a href="/components-agents">Agent</a>. The <code>name</code> and <code>description</code> metadata that the Agent uses to register the tool are created automatically.</p>
<p>When you select a flow, the component fetches the flow&#x27;s graph structure and uses it to generate the inputs and outputs for the Run Flow component.</p>
<p>To use the Run Flow component as a tool, do the following:</p>
<ol>
<li>Add the <strong>Run Flow</strong> component to the <a href="/starter-projects-simple-agent">Simple Agent</a> flow.</li>
<li>In the <strong>Flow Name</strong> menu, select the sub-flow you want to run.
The appearance of the <strong>Run Flow</strong> component changes to reflect the inputs and outputs of the selected flow.</li>
<li>On the <strong>Run Flow</strong> component, enable <strong>Tool Mode</strong>.</li>
<li>Connect the <strong>Run Flow</strong> component to the <strong>Toolset</strong> input of the Agent.
Your flow should now look like this:
<img decoding="async" loading="lazy" alt="Run Flow component" src="/assets/images/component-run-flow-78e94e2ede1b4b853f0e4de6b9561f6f.png" width="2036" height="1582" class="img_ev3q"></li>
<li>Run the flow. The Agent uses the Run Flow component as a tool to run the selected sub-flow.</li>
</ol>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="inputs-7">Inputs<a href="#inputs-7" class="hash-link" aria-label="Direct link to Inputs" title="Direct link to Inputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>flow_name_selected</td><td>Dropdown</td><td>The name of the flow to run.</td></tr><tr><td>flow_tweak_data</td><td>Dict</td><td>Dictionary of tweaks to customize the flow&#x27;s behavior.</td></tr><tr><td>dynamic inputs</td><td>Various</td><td>Additional inputs that are generated based on the selected flow.</td></tr></tbody></table>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="outputs-7">Outputs<a href="#outputs-7" class="hash-link" aria-label="Direct link to Outputs" title="Direct link to Outputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>run_outputs</td><td>A <code>List</code> of types <code>Data</code>, <code>Message,</code> or <code>DataFrame</code></td><td>All outputs are generated from running the flow.</td></tr></tbody></table>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="sub-flow">Sub flow<a href="#sub-flow" class="hash-link" aria-label="Direct link to Sub flow" title="Direct link to Sub flow">​</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>This component is deprecated as of Langflow version 1.1.2.
Instead, use the <a href="/components-logic#run-flow">Run flow component</a></p></div></div>
<p>This <code>SubFlowComponent</code> generates a component from a flow with all of its inputs and outputs.</p>
<p>This component can integrate entire flows as components within a larger workflow. It dynamically generates inputs based on the selected flow and executes the flow with provided parameters.</p>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="inputs-8">Inputs<a href="#inputs-8" class="hash-link" aria-label="Direct link to Inputs" title="Direct link to Inputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>flow_name</td><td>Dropdown</td><td>The name of the flow to run.</td></tr></tbody></table>
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="outputs-8">Outputs<a href="#outputs-8" class="hash-link" aria-label="Direct link to Outputs" title="Direct link to Outputs">​</a></h3>
<table><thead><tr><th>Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>flow_outputs</td><td>List[Data]</td><td>The outputs generated from the flow.</td></tr></tbody></table></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/components-loaders"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Loaders</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/components-memories"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Memories</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="#use-a-logic-component-in-a-flow" class="table-of-contents__link toc-highlight">Use a logic component in a flow</a></li><li><a href="#conditional-router-if-else-component" class="table-of-contents__link toc-highlight">Conditional router (If-Else component)</a><ul><li><a href="#inputs" class="table-of-contents__link toc-highlight">Inputs</a></li><li><a href="#outputs" class="table-of-contents__link toc-highlight">Outputs</a></li></ul></li><li><a href="#data-conditional-router" class="table-of-contents__link toc-highlight">Data conditional router</a><ul><li><a href="#inputs-1" class="table-of-contents__link toc-highlight">Inputs</a></li><li><a href="#outputs-1" class="table-of-contents__link toc-highlight">Outputs</a></li></ul></li><li><a href="#flow-as-tool" class="table-of-contents__link toc-highlight">Flow as tool</a><ul><li><a href="#inputs-2" class="table-of-contents__link toc-highlight">Inputs</a></li><li><a href="#outputs-2" class="table-of-contents__link toc-highlight">Outputs</a></li></ul></li><li><a href="#listen" class="table-of-contents__link toc-highlight">Listen</a><ul><li><a href="#inputs-3" class="table-of-contents__link toc-highlight">Inputs</a></li><li><a href="#outputs-3" class="table-of-contents__link toc-highlight">Outputs</a></li></ul></li><li><a href="#loop" class="table-of-contents__link toc-highlight">Loop</a><ul><li><a href="#inputs-4" class="table-of-contents__link toc-highlight">Inputs</a></li><li><a href="#outputs-4" class="table-of-contents__link toc-highlight">Outputs</a></li></ul></li><li><a href="#notify" class="table-of-contents__link toc-highlight">Notify</a><ul><li><a href="#inputs-5" class="table-of-contents__link toc-highlight">Inputs</a></li><li><a href="#outputs-5" class="table-of-contents__link toc-highlight">Outputs</a></li></ul></li><li><a href="#pass-message" class="table-of-contents__link toc-highlight">Pass message</a><ul><li><a href="#inputs-6" class="table-of-contents__link toc-highlight">Inputs</a></li><li><a href="#outputs-6" class="table-of-contents__link toc-highlight">Outputs</a></li></ul></li><li><a href="#run-flow" class="table-of-contents__link toc-highlight">Run flow</a><ul><li><a href="#inputs-7" class="table-of-contents__link toc-highlight">Inputs</a></li><li><a href="#outputs-7" class="table-of-contents__link toc-highlight">Outputs</a></li></ul></li><li><a href="#sub-flow" class="table-of-contents__link toc-highlight">Sub flow</a><ul><li><a href="#inputs-8" class="table-of-contents__link toc-highlight">Inputs</a></li><li><a href="#outputs-8" class="table-of-contents__link toc-highlight">Outputs</a></li></ul></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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