jscpd
Find duplicate code blocks and analyze duplication metrics across files. Use when identifying copy-pasted code, measuring technical debt, or preparing for refactoring.
Find duplicate code blocks and analyze duplication metrics across files. Use when identifying copy-pasted code, measuring technical debt, or preparing for refactoring.
jscpd
Duplicate code detector supporting 150+ languages.
Usage
# Analyze directory
npx jscpd /path/to/source
# With pattern filter
npx jscpd --pattern "src/**/*.js" .
# Ignore directories
npx jscpd --ignore "**/node_modules/**,**/dist/**" .
# Minimum tokens to match (default: 50)
npx jscpd --min-tokens 30 .
# Output formats
npx jscpd --reporters json --output report.json .
npx jscpd --reporters html --output ./report/ .
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
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