jscpd

jscpd is a copy-paste detection tool that scans source code for duplicated blocks across 223 to 224 language formats, using the Rabin-Karp algorithm to identify clones. It ships in two variants: a TypeScript engine (v4) with 13 reporters, LevelDB store support, and a Node.js programming API, and a ground-up Rust rewrite (v5) that runs as a self-contained binary with no Node.js dependency, delivering 24 to 37 times faster detection on real codebases. The MCP server integration allows Claude Code and other MCP-compatible agents to invoke duplicate detection directly as a tool call during code review or refactoring tasks. An AI reporter outputs results in a token-efficient format roughly 79 percent leaner than standard console output, making it practical for LLM pipelines where context budgets matter. The v5 Rust engine also adds git blame with side-by-side author comparison via gitoxide, and parallel file tokenization controlled through a workers flag. Developers, CI pipelines, and AI coding agents working across large polyglot repositories are the primary audience.

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