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
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Run jscpd to find duplicates
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Review the reported duplicates
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Refactor to eliminate duplication
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Re-run to verify cleanup
Related Skills
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maintenance: Refactoring and technical debt management
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design: DRY principle violations
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ast-grep: Structural refactoring of duplicated patterns