Custom Document Loader

Custom function for loading documents.

Custom Document Loader Node

The Custom Document Loader provides the ability to create custom document loading functionality using JavaScript. This module enables flexible and customized document processing through user-defined functions.

This module provides a flexible document loader that can:

• Execute custom JavaScript functions for document loading

• Handle input variables dynamically

• Support both document and text outputs

• Run in a sandboxed environment

• Access flow context and variables

• Process custom metadata

Inputs

Required Parameters

• Javascript Function: Custom code that returns either:

  • Array of document objects (for Document output)

  • String (for Text output)

Optional Parameters

• Input Variables: JSON object containing variables accessible in the function with $ prefix

Outputs

• Document: Array of document objects containing metadata and pageContent

• Text: Concatenated string from pageContent of documents

Features

• Sandboxed execution environment

• Variable injection support

• Flow context access

• Custom dependency support

• Error handling

• Timeout protection

• Input validation

Document Structure

When returning documents, each object must have:

{
  pageContent: 'Document Content',
  metadata: {
    title: 'Document Title',
    // ... other metadata
  }
}

Example Usage

Document Output

return [
  {
    pageContent: 'Document Content',
    metadata: {
      title: 'Document Title',
      source: 'Custom Source'
    }
  }
]

Text Output

return "Processed text content"

Available Context

• $input: Input value passed to the function

• $vars: Access to flow variables

• $flow: Flow context object containing:

  • chatflowId

  • sessionId

  • chatId

  • input

Notes

• Functions run in a secure sandbox

• 10-second execution timeout

• Built-in dependencies available

• External dependencies configurable

• Input variables must be valid JSON

• Error handling for invalid returns

• Supports async operations