jscpd
Detect and analyze duplicate code in JavaScript, TypeScript, and other languages. Use when identifying duplicate code blocks, analyzing code duplication metrics, improving maintainability, or supporting refactoring efforts.
Installation
Follow the repository instructions for this skill and your agent. Review the files and dependencies before adding it to your workflow.
View source ↗GuidesSkill instructions
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
Examples
Read the usage examples in the source repository.
View source ↗Source history
- Indexed on
- 2026-01-20
- Index updated
- 2026-01-26
- Branch
- main
Index and sync dates describe this directory. View the source repository for code history.
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