n8n version: 1.69.2 (cloud):
Running n8n via iMac Desktop.
Operating system: MacOS Sequoia 15.2 M4 16Gb
Workflow:
Webhook → OpenAI Assistant → Code 1 → Code 2 → Set → HTML
Subject: Persistent Syntax Error in HTML Node with {{#each}} Helper (Generate HTML Template)
Hi everyone,
I’m encountering a persistent “invalid syntax” error in the HTML node of my n8n workflow, specifically when using the {{#each}} helper within the “Generate HTML Template” operation. I’ve been troubleshooting this extensively and would appreciate any insights or suggestions.
My Workflow:
The workflow is relatively simple:
- Code Node: [ Briefly describe what your Code node does - e.g., fetches data from an API, manipulates data, etc. ]
- Edit Fields Node: This node takes the output from the Code node and structures it into a JSON object.
- Mode: JSON
- JSON Configuration:
{
"patientName": "{{ $json[0].patientName }}",
"providerName": "{{ $json[0].providerName }}",
"dateOfEncounter": "{{ $json[0].dateOfEncounter }}",
"narrativeSummary": "{{ $json[0].narrativeSummary }}",
"impression": {{ $json[0].impression }},
"plan": {{ $json[0].plan }},
"problemAnalysis": "{{ $json[0].problemAnalysis }}",
"dataReview": "{{ $json[0].dataReview }}",
"riskAssessment": "{{ $json[0].riskAssessment }}",
"clinicalJustification": "{{ $json[0].clinicalJustification }}",
"managementPathway": "{{ $json[0].managementPathway }}"
}
- Input JSON to Edit Fields:
[
{
"patientName": "** Mr. John Hinkle \n**Health Provider Name:** Dr. Amy Smith \n**Date of Encounter:** December 10, 2024",
"providerName": "** Dr. Amy Smith \n**Date of Encounter:** December 10, 2024",
"dateOfEncounter": "** December 10, 2024",
"narrativeSummary": "During the yearly follow-up for Mr. John Hinkle's ongoing treatment of sleep apnea, there were positive findings regarding his compliance with the prescribed CPAP therapy and its efficiency in managing his symptoms. He demonstrates a strong understanding of his treatment regimen and maintains his equipment appropriately. His current BMI is 34, indicating a need for weight management. His follow-up is scheduled for the next year.",
"impression": [
"Diagnosis: Sleep Apnea, Severe."
],
"plan": [
"1. Continue using the CPAP machine at current settings."
],
"problemAnalysis": "",
"dataReview": "",
"riskAssessment": "",
"clinicalJustification": "",
"managementPathway": ""
}
]
- Output JSON of Edit Fields (which is the Input to the HTML Node):
[
{
"patientName": "** Mr. John Hinkle \n**Health Provider Name:** Dr. Amy Smith \n**Date of Encounter:** December 10, 2024",
"providerName": "** Dr. Amy Smith \n**Date of Encounter:** December 10, 2024",
"dateOfEncounter": "** December 10, 2024",
"narrativeSummary": "During the yearly follow-up for Mr. John Hinkle's ongoing treatment of sleep apnea, there were positive findings regarding his compliance with the prescribed CPAP therapy and its efficiency in managing his symptoms. He demonstrates a strong understanding of his treatment regimen and maintains his equipment appropriately. His current BMI is 34, indicating a need for weight management. His follow-up is scheduled for the next year.",
"impression": [
"Diagnosis: Sleep Apnea, Severe."
],
"plan": [
"1. Continue using the CPAP machine at current settings."
],
"problemAnalysis": "",
"dataReview": "",
"riskAssessment": "",
"clinicalJustification": "",
"managementPathway": ""
}
]
- HTML Node: This node is configured to generate an HTML report from the JSON data.
- Operation: Generate HTML Template
- HTML Template:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Medical Report</title>
<style>
body {
font-family: Arial, sans-serif;
margin: 20px;
}
h1, h2 {
color: #333;
}
ul {
list-style-type: none;
padding-left: 0;
}
</style>
</head>
<body>
<h1>Medical Report</h1>
<h2>Patient Information</h2>
<p><strong>Patient Name:</strong> {{ $json.patientName }}</p>
<p><strong>Provider Name:</strong> {{ $json.providerName }}</p>
<p><strong>Date of Encounter:</strong> {{ $json.dateOfEncounter }}</p>
<h2>Narrative Summary</h2>
<p>{{ $json.narrativeSummary }}</p>
<h2>Impression</h2>
<ul>
{{#each impression}}
<li>{{ this }}</li>
{{/each}}
</ul>
<h2>Plan</h2>
<ul>
{{#each plan}}
<li>{{ this }}</li>
{{/each}}
</ul>
<h2>Problem Analysis</h2>
<p>{{ $json.problemAnalysis }}</p>
<h2>Data Review</h2>
<p>{{ $json.dataReview }}</p>
<h2>Risk Assessment</h2>
<p>{{ $json.riskAssessment }}</p>
<h2>Clinical Justification</h2>
<p>{{ $json.clinicalJustification }}</p>
<h2>Management Pathway</h2>
<p>{{ $json.managementPathway }}</p>
</body>
</html>
Expected Output:
A well-formatted HTML document displaying the patient’s medical information.
Actual Output (Error):
Error: invalid syntax at Expression.renderExpression (/usr/local/lib/node_modules/n8n/node_modules/n8n-workflow/dist/Expression.js:234:23) at Expression.resolveSimpleParameterValue (/usr/local/lib/node_modules/n8n/node_modules/n8n-workflow/dist/Expression.js:207:34) at Object.evaluateExpression (/usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/NodeExecuteFunctions.js:2270:44) at Object.execute (/usr/local/lib/node_modules/n8n/node_modules/n8n-nodes-base/dist/nodes/Html/Html.node.js:444:62) at Workflow.runNode (/usr/local/lib/node_modules/n8n/node_modules/n8n-workflow/dist/Workflow.js:722:42) at /usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/WorkflowExecute.js:706:66 at /usr/local/lib/node_modules/n8n/node_modules/n8n-core/dist/WorkflowExecute.js:1137:20
Troubleshooting Steps Taken:
- Verified that the input to the HTML node is valid JSON.
- Confirmed that the “Operation” in the HTML node is set to “Generate HTML Template”.
- Tested with a simplified HTML template to isolate the issue.
- Experimented with various Handlebars syntax for accessing data, including
$json.propertyName,$json[0].propertyName, and accessing properties directly within the{{#each}}loop. - Added conditional checks (
{{#if}}) around the{{#each}}loops. - Used a Set node to inspect the data being passed to the HTML node.
- Confirmed that, in “Generate HTML Template” mode,
$jsonrefers to the first item of the input array.
n8n Version:
1.69.2 (Cloud)
The Issue:
The error consistently occurs when the HTML node attempts to render the {{#each impression}} and {{#each plan}} loops. It seems like there might be a specific issue with how the HTML node in this version is handling the {{#each}} helper within the “Generate HTML Template” operation.
Has anyone encountered a similar issue or have any suggestions for resolving this syntax error?
Thank you for your time and assistance!
