jscpd
Finds duplicate code blocks and analyzes duplication metrics across files. Use when identifying copy-pasted code, measuring technical debt, or preparing for refactoring.
Install
npx skillscat add knoopx/pi/jscpd Install via the SkillsCat registry.
SKILL.md
jscpd
Copy-paste detector for JavaScript, TypeScript, and many other languages.
Quick Start
# With ignore patterns
bunx jscpd --ignore "**/node_modules/**,**/dist/**" <path>
Common Options
| Option | Description |
|---|---|
--min-tokens N |
Minimum tokens for duplicate detection |
--min-lines N |
Minimum lines for duplicate detection |
--threshold N |
Fail if duplication % exceeds threshold |
--ignore "glob" |
Ignore patterns (comma-separated) |
--reporters type |
Output format: console, json, html |
--output path |
Output directory for reports |
--silent |
Suppress console output |
Workflow
- Run jscpd to find duplicates
- Review the reported duplicates
- Refactor to eliminate duplication
- Re-run to verify cleanup
Related Skills
- maintenance: Refactoring and technical debt management
- design: DRY principle violations
- ast-grep: Structural refactoring of duplicated patterns
Categories
Install
npx skillscat add knoopx/pi/jscpd Install via the SkillsCat registry.