jscpd

Detect duplicate code blocks and report duplication metrics across JavaScript, TypeScript, and other languages.

68|1|Updated Jan 14, 2026
One-click install
npx skills add https://github.com/knoopx/pi --skill jscpd
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: jscpd
Source: https://github.com/knoopx/pi/tree/main/agent/skills/jscpd
Command: npx skills add https://github.com/knoopx/pi --skill jscpd

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Duplicate code blocks across a codebase lead to higher maintenance costs and increased risk of bugs. This skill helps teams quickly locate and quantify duplication to guide refactoring decisions.

Core Features & Use Cases

  • Duplicate detection across JavaScript, TypeScript, and other languages
  • Provides metrics on duplication density to prioritize cleanup
  • Use Case: Before a major release, scan a project to identify copy-pasted patterns and consolidate them for maintainability

Quick Start

Run the jscpd tool on your project to output duplication reports and actionable insights.

Frequently Asked Questions about jscpd

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I detect duplicate code blocks in a JavaScript project?

You can detect duplicate code blocks in a JavaScript project by running static analysis to identify copied patterns and quantify code duplication across the codebase. This process outputs reports that guide refactoring decisions for better maintainability.

Does code duplication detection work for TypeScript files?

Yes, code duplication detection works for TypeScript files alongside JavaScript and other programming languages. It scans these projects of any size to locate copy-pasted patterns and measure duplication density to prioritize cleanup.

What is the best way to quantify code duplication before a major release?

The best way to quantify code duplication before a major release is to run a static analysis tool that scans the codebase for copy-pasted patterns. It provides metrics on duplication density to prioritize consolidation and refactoring.

How do I measure duplication density to prioritize refactoring?

You measure duplication density by scanning your software project to identify repeated code blocks. The analysis generates metrics that quantify the prevalence of duplication, enabling teams to prioritize cleanup and reduce maintenance risks.

Can I generate actionable refactoring reports from static analysis of code duplication?

Yes, you can generate actionable refactoring reports from static analysis of code duplication. The tool outputs metrics and insights that locate duplicate code blocks, quantify their prevalence, and guide teams in consolidating patterns for maintainability.

Why should I scan for copy-pasted patterns across my codebase?

You should scan for copy-pasted patterns because duplicate code blocks lead to higher maintenance costs and increased bug risks. Quantifying duplication density helps teams prioritize refactoring decisions and consolidate code for long-term maintainability.