n8n-nodes-remove-special-chars

This package provides an n8n node for removing watermarks and special characters from text or JSON data. This is particularly useful when working with AI-generated content that may contain invisible watermarks (like those in OpenAI responses).

Features

The Remove Special Characters node provides three cleaning strategies:

1. Standard Clean: Removes invisible/zero-width characters while preserving most text formatting
2. Aggressive Clean: Removes all non-alphanumeric characters (letters, numbers, spaces only)
3. Smart Clean: Targets common watermark patterns while preserving legitimate formatting

Configuration Options

• Mode: Choose between Standard, Aggressive, or Smart cleaning
• Input Field: The field containing the text to clean
• Output Field: The field to store the cleaned text
• Process JSON Objects: Recursively process all string fields in JSON objects
• Advanced Options (Standard mode only):
  • Keep Punctuation
  • Keep Numbers
  • Keep Accented Characters
  • Custom Characters to Preserve

Installation

Follow these steps to install this custom node:

# Install n8n if you haven't already
npm install n8n -g

# Install the custom node
npm install n8n-nodes-remove-special-chars

# Start n8n with the custom node
n8n start

Usage

1. Add the "Remove Special Characters" node to your workflow
2. Configure the node:
   • Select the cleaning mode (Standard, Aggressive, or Smart)
   • Specify the input field containing text to clean
   • Specify the output field for the cleaned text
   • Adjust advanced options as needed
3. Connect the node to your workflow

Character Types Removed

Depending on the cleaning mode, the node can remove:

• Zero-width characters (U+200B to U+200D, U+FEFF)
• Soft hyphens, combining marks (U+00AD, U+034F)
• Direction formatting characters (U+061C, U+2066-U+2069)
• Other invisible formatting characters
• Unusual Unicode character sequences often used in watermarks

Development

If you want to contribute or modify this node:

1. Clone the repository

   git clone https://github.com/berrydev/n8n-nodes-remove-special-chars.git

2. Install dependencies

   npm install

3. Build the code

   npm run build

4. Link to n8n

   npm link
   cd ~/.n8n
   npm link n8n-nodes-remove-special-chars

License

MIT