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<!-- -->
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<p>The <strong>Parser</strong> component extracts text from structured data (<code>Table</code> or <code>JSON</code>) using a template or direct stringification.
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The output is a <code>Message</code> containing the parsed text.</p>
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<p>This is a versatile component for data extraction and manipulation in your flows.
|
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For examples of <strong>Parser</strong> components in flows, see the following:</p>
|
||
<ul>
|
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<li class=""><a class="" href="/batch-run"><strong>Batch Run</strong> component example</a></li>
|
||
<li class=""><a class="" href="/structured-output"><strong>Structured Output</strong> component example</a></li>
|
||
<li class=""><strong>Financial Report Parser</strong> template</li>
|
||
<li class=""><a class="" href="/webhook">Trigger flows with webhooks</a></li>
|
||
<li class=""><a class="" href="/chat-with-rag">Create a vector RAG chatbot</a></li>
|
||
</ul>
|
||
<p><img decoding="async" loading="lazy" alt="A flow that uses a Parser component to extract text from a Structured Output component." src="/assets/images/component-parser-1d1d72593f02991e5b14b6b1c112a744.png" width="4000" height="2202" class="img_ev3q"></p>
|
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<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="parsing-modes">Parsing modes<a href="#parsing-modes" class="hash-link" aria-label="Direct link to Parsing modes" title="Direct link to Parsing modes" translate="no"></a></h2>
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<p>The <strong>Parser</strong> component has two modes: <strong>Parser</strong> and <strong>Stringify</strong>.</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">Parser (template) mode</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Stringify mode</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><p>In <strong>Parser</strong> mode, you create a template for text output that can include literal strings and variables for extracted keys.</p><p>Use curly braces to define variables anywhere in the template.
|
||
Variables must match keys in the <code>Table</code> or <code>JSON</code> input, such as column names.
|
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For example, <code>{name}</code> extracts the value of a <code>name</code> key.
|
||
For more information about the content and structure of <code>Table</code> and <code>JSON</code> objects, see <a class="" href="/data-types">Langflow data types</a>.</p><p>If your template includes literal text and variables, you can use double curly braces to escape literal curly braces in the template and prevent interpretation of that text as a variable.
|
||
For example: <code>This is a template with {{literal text in curly braces}} and a {variable}</code>.</p>
|
||
<p>If your template contains many literal curly braces, such as JSON structures, consider using Mustache templating instead.
|
||
For more information, see <a class="" href="/components-prompts#use-mustache-templating-in-prompt-templates">Use Mustache templating in prompt templates</a>.</p><p>When the flow runs, the <strong>Parser</strong> component iterates over the input, producing a <code>Message</code> for each parsed item.
|
||
For example, parsing a <code>Table</code> creates a <code>Message</code> for each row, populated with the unique values from that row.</p><details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Employee summary template</summary><div><div class="collapsibleContent_i85q"><p>This example template extracts employee data into a natural language summary about an employee's hire date and current role:</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>{employee_first_name} {employee_last_name} was hired on {start_date}.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>Their current position is {job_title} ({grade}).</span></div></div><br></code></div></div><p>The resulting <code>Message</code> output replaces the variables with the corresponding extracted values.
|
||
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>Renlo Kai was hired on 11-July-2017.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>Their current position is Software Engineer (Principal).</span></div></div><br></code></div></div></div></div></details><details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Employee profile template</summary><div><div class="collapsibleContent_i85q"><p>This example template uses Markdown syntax and extracted employee data to create an employee profile:</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># Employee Profile</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>## Personal Information</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>- **Name:** {name}</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>- **ID:** {id}</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>- **Email:** {email}</span></div></div><br></code></div></div><p>When the flow runs, the <strong>Parser</strong> component iterates over each row of the <code>Table</code>, populating the template's variables with the appropriate extracted values.
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||
The resulting text for each row is output as a <a class="" href="/data-types#message"><code>Message</code></a>.</p></div></div></details><p>The following parameters are available in <strong>Parser</strong> mode.</p><p>Some parameters are hidden by default in the visual editor.
|
||
You can modify all component parameters through the <a class="" href="/concepts-components#component-inspection-panel">component inspection panel</a> that appears when you select a component.</p><table><thead><tr><th>Name</th><th>Display Name</th><th>Info</th></tr></thead><tbody><tr><td>input_data</td><td>JSON or Table</td><td>Input parameter. The <code>JSON</code> or <code>Table</code> input to parse.</td></tr><tr><td>pattern</td><td>Template</td><td>Input parameter. The formatting template using plaintext and variables for keys (<code>{KEY_NAME}</code>). See the preceding examples for more information.</td></tr><tr><td>sep</td><td>Separator</td><td>Input parameter. A string defining the separator for rows or lines. Default: <code>\n</code> (new line).</td></tr><tr><td>clean_data</td><td>Clean Data</td><td>Whether to remove empty rows and lines in each cell or key of the <code>Table</code> or <code>JSON</code> input. Default: Enabled (<code>true</code>)</td></tr></tbody></table></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><p>Use <strong>Stringify</strong> mode to convert the entire input directly to text.
|
||
This mode doesn't support templates or key selection.</p><p>The following parameters are available in <strong>Stringify</strong> mode.</p><p>Some parameters are hidden by default in the visual editor.
|
||
You can modify all component parameters through the <a class="" href="/concepts-components#component-inspection-panel">component inspection panel</a> that appears when you select a component.</p><table><thead><tr><th>Name</th><th>Display Name</th><th>Info</th></tr></thead><tbody><tr><td>input_data</td><td>JSON or Table</td><td>Input parameter. The <code>JSON</code> or <code>Table</code> input to parse.</td></tr><tr><td>sep</td><td>Separator</td><td>Input parameter. A string defining the separator for rows or lines. Default: <code>\n</code> (new line).</td></tr><tr><td>clean_data</td><td>Clean Data</td><td>Whether to remove empty rows and lines in each cell or key of the <code>Table</code> or <code>JSON</code> input. Default: Enabled (<code>true</code>)</td></tr></tbody></table></div></div></div>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="test-and-troubleshoot-parsed-text">Test and troubleshoot parsed text<a href="#test-and-troubleshoot-parsed-text" class="hash-link" aria-label="Direct link to Test and troubleshoot parsed text" title="Direct link to Test and troubleshoot parsed text" translate="no"></a></h2>
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||
<p>To test the <strong>Parser</strong> component, 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-play lf-inline-icon" aria-hidden="true" focusable="false" role="presentation"><polygon points="6 3 20 12 6 21 6 3"></polygon></svg> <strong>Run component</strong>, and then 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> to see the <code>Message</code> output with the parsed text.
|
||
You can also connect a <strong>Chat Output</strong> component if you want to view the output in the <strong>Playground</strong>.</p>
|
||
<p>If the <code>Message</code> output from the <strong>Parser</strong> component has empty or unexpected values, there might be a mapping error between the input and the parsing mode, the input has empty values, or the input isn't suitable for plaintext extraction.</p>
|
||
<p>For example, assume you use the following template to parse a <code>Table</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>{employee_first_name} {employee_last_name} is a {job_title} ({grade}).</span></div></div><br></code></div></div>
|
||
<p>The following <code>Message</code> could result from parsing a row where <code>employee_first_name</code> was empty and <code>grade</code> was <code>null</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> Smith is a Software Engineer (null).</span></div></div><br></code></div></div>
|
||
<p>To troubleshoot missing or unexpected values, you can do the following:</p>
|
||
<ul>
|
||
<li class="">
|
||
<p>Make sure the variables in your template map to keys in the incoming <code>JSON</code> or <code>Table</code>.
|
||
To see the data being passed directly to the <strong>Parser</strong> component, 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 that is sending data to the <strong>Parser</strong> component.</p>
|
||
</li>
|
||
<li class="">
|
||
<p>Check the source data for missing or incorrect values.
|
||
There are several ways you can address these inconsistencies:</p>
|
||
<ul>
|
||
<li class="">Rectify the source data directly.</li>
|
||
<li class="">Use other components to amend or filter anomalies before passing the data to the <strong>Parser</strong> component.
|
||
There are many components you can use for this depending on your goal, such as the <a class="" href="/data-operations"><strong>JSON Operations</strong> component</a>, <a class="" href="/structured-output"><strong>Structured Output</strong> component</a>, and <a class="" href="/smart-transform"><strong>Smart Transform</strong> component</a>.</li>
|
||
<li class="">Enable the <strong>Parser</strong> component's <strong>Clean Data</strong> parameter to skip empty rows or lines.</li>
|
||
</ul>
|
||
</li>
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