jscpd — Copy/Paste Detector + MCP Server

Main

• Use jscpd as a regression guard: run it in CI to keep copy/paste from silently spreading during fast iterations.

• Tune it for agent refactors: set a token threshold so you catch true duplication without flagging common boilerplate.

• Prefer the server mode when you need repeated queries across multiple repos or a UI/report pipeline.

• Treat supported formats as a scope knob: start narrow (your main language), then expand once the baseline is clean.

README (excerpt)

jscpd

Copy/paste detector for programming source code, supports 223 formats. AI-ready with MCP server and token-efficient reporter.

Copy/paste is a common technical debt on a lot of projects. The jscpd gives the ability to find duplicated blocks implemented on more than 223 programming languages and digital formats of documents. The jscpd tool implements Rabin-Karp algorithm for searching duplications.

Packages of jscpd

name	version	description
jscpd		main package for jscpd (cli and API for detections included)
jscpd-server		jscpd server application

Source-backed notes

• README states it supports 223 formats and provides both CLI and server installs (npm install -g jscpd / jscpd-server).
• Repo is MIT licensed and actively maintained (verified via GitHub API).
• README includes a pnpm install path for contributors (repo build instructions).

FAQ

• Is it only for JavaScript?: No—README says it supports 223 formats; run it against your repo language set.
• How do I install the CLI?: Use npm install -g jscpd (README install section).
• Can I run it as a service?: Yes—README mentions server mode (jscpd-server).