Duplytic

A VS Code extension that helps you find and visualize duplicate code in your projects.

Marketplace · Features · Installation · Usage · Configuration

Features

• Workspace-wide scanning – Analyze your entire project for duplicated code blocks.
• Rich duplication report – See total duplicated lines, percentage of duplication, and affected files.
• Clickable navigation – Jump straight into duplicated regions from the report.
• Inline code previews – View the duplicated fragments side-by-side in a modern webview.
• Multi-language support – Works with TypeScript, JavaScript, HTML, CSS, JSON, Markdown, and more.

Installation

From the VS Code Marketplace

1. Open the Extensions view in VS Code.
2. Search for "Duplytic" or install directly via:

   code --install-extension thompson-development-group.duplytic
   

3. Reload VS Code if prompted.

From source

1. Clone the repository:

   git clone https://github.com/Thompson-Development-Group/Duplytic.git
   cd Duplytic
   

2. Install dependencies:

   npm install
   

3. Compile the extension:

   npm run compile
   

4. Press F5 in VS Code to launch a new Extension Development Host with Duplytic loaded.

Usage

1. Open a workspace folder in VS Code.
2. Open the Command Palette (Cmd+Shift+P on macOS / Ctrl+Shift+P on Windows/Linux).
3. Run "Scan for Code Duplication".
4. A Duplytic report webview will open, showing:
   • Overall duplication statistics.
   • A list of duplicated blocks.
   • Links you can click to open each duplicated region in the editor.

Configuration

You can customize how Duplytic scans your code by adding these settings to your VS Code settings.json:

{
  "codeDuplicationDetector.minLines": 5,
  "codeDuplicationDetector.minTokens": 50,
  "codeDuplicationDetector.formats": ["**/*.{ts,tsx,js,jsx,html,css,scss,json,md}"],
  "codeDuplicationDetector.exclude": ["**/node_modules/**", "**/dist/**"]
}

Extension settings

• codeDuplicationDetector.minLines – Minimum number of lines to consider as a duplicate (default: 5).
• codeDuplicationDetector.minTokens – Minimum number of tokens to consider as a duplicate (default: 50).
• codeDuplicationDetector.formats – Glob patterns for files to include in the scan.
• codeDuplicationDetector.exclude – Glob patterns for files and folders to exclude.

Requirements

• Node.js v14 or later available in your PATH.
• Visual Studio Code 1.75.0 or higher.

Known Issues

• Large codebases may take some time to scan.
• Very small or highly similar boilerplate may produce occasional false positives.

Release Notes

0.1.0

• Initial release of Duplytic.

License

This project is licensed under the MIT License.