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Vars Pro - Generate HTML page to view local JSON file data (Supports polling refresh). Use with Webhook node, return $json.html in HTTP Response node
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Overview

This node generates an HTML page to view local JSON file data related to workflow executions and workflow-level data. It supports automatic polling refresh to keep the displayed data up-to-date. It is useful for monitoring and inspecting execution data and workflow variables in real-time, especially when used with a Webhook node and HTTP Response node to serve the HTML content dynamically.

Use Case Examples

  1. Use case: Monitor execution-level JSON files to track workflow runs and their variables.
  2. Use case: Display workflow-level JSON data to inspect global workflow variables.
  3. Use case: Combine both execution and workflow data views for comprehensive monitoring.

Properties

Name Meaning
Data Type Selects the type of data to view: execution-level data, workflow-level data, or all data.
Poll Interval (Seconds) Interval in seconds for the frontend page to automatically refresh.
Allow View Whether to allow viewing data (enables or disables the view function).

Output

JSON

  • html - The generated HTML page content for viewing the data.
  • body - Same as html, the HTML content for the frontend.
  • data - The raw JSON data object containing workflow and execution data.
  • _contentType - Content type header set to 'text/html' for the HTTP response.

Dependencies

  • Requires access to local JSON files stored in the n8n data directory or a custom directory specified by environment variables.
  • Uses Node.js 'fs' and 'path' modules to read JSON files.

Troubleshooting

  • If 'Allow View' is set to false, the node returns an error message indicating the view function is disabled.
  • If JSON files are missing or unreadable, the node returns an error message with details.
  • Ensure the environment variable N8N_DATA_DIR or default data directory is correctly set and accessible.
  • Errors during file reading or JSON parsing will be caught and returned as error messages in the output.

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