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kucherenko/jscpd

Copy/paste detector for source code. 220+ languages, Rust engine, SARIF/HTML/badge reporters, GitHub Action, MCP server for AI agents.

About the project

jscpd is a source-code copy/paste detector that finds duplicated code blocks across files and reports the results in formats such as SARIF, HTML, and badges. Developers use it for code-quality checks, continuous integration, pre-commit hooks, and agent-assisted reviews across many programming-language formats. Its catalogue skills help coding agents run or interpret duplication checks.

Open on GitHub jscpd.dev
6.4kStars on the repository
5Mods indexed here, across every type
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dry-refactoring

01

kucherenko/jscpd

Skill Claude CodeCodex

Guided workflow to eliminate copy-paste duplication detected by jscpd. Refactor exact, renamed and near-miss clones using extract function, parameterize, module, constant, or base class strategies, starting from the hotspots the summary ranks.

not rated 6.4k +32 changed 13d ago A Socket: passSnyk: passSkillSpector: warn 53 tokens original MIT

jscpd

02

kucherenko/jscpd

Skill Claude CodeCodex

Copy-paste detector for 220+ languages. Detect exact, renamed and near-miss duplicated code, measure duplication percentages, and find refactoring hotspots with the codebase summary.

not rated 6.4k +32 changed yesterday A Socket: warnSnyk: passSkillSpector: warn 40 tokens original MIT

codebase-refactoring

03

kucherenko/jscpd

Skill Claude CodeCodex

Three-part workflow to improve overall codebase health with jscpd — find and fix duplicated code, find and remove or refactor dead code, then find and simplify the largest/most complex files. Starts from --dashboard/--health to prioritize and ends by re-measuring the score.

not rated 6.4k +32 today A Socket: passSnyk: pass 63 tokens original MIT

code-migration

04

kucherenko/jscpd

Skill Claude CodeCodex

Move code from one implementation to another function by function, tests first and code second, and check two implementations of one app for parity, with jscpd --compare as the progress measure and a coverage map binding each function to its tests. Use when porting a library or app to another language or framework…

not rated 6.4k +32 changed 19d ago A 110 tokens original MIT

compare-codebases

05

kucherenko/jscpd

Skill Claude CodeCodex

Compare two folders function by function with jscpd --compare, in the same language or across languages, and explain the result. Use when asked how two codebases relate, which functions one implementation has and the other lacks, how far a port has come, whether the iOS and Android versions of an app match, or which…

not rated 6.4k +32 changed 10d ago A 82 tokens original MIT

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