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