rust

cpd — Rust Copy/Paste Detector

Fast copy/paste detector for programming source code. 24-37x faster than Node.js. Rust rewrite of jscpd, supports 223 language formats.

Also available as an npm package: jscpd@5 (installs the jscpd command) or cpd (installs the cpd command). The crates.io install exposes both jscpd and cpd binaries.

Performance

Codebase	Files	Size	jscpd v4 (Node.js)	cpd v5 (Rust)	Speedup
Multi-format fixtures	548	1.5 MB	1.03 s	0.03 s	34.3×
Svelte source	9K	38 MB	15.80 s	0.43 s	36.9×
CopilotKit	17K	159 MB	82.89 s	3.44 s	24.1×

See performance-comparison.md for full methodology and raw data.

Install

npm (recommended)

# npm — installs the jscpd command
npm install -g jscpd

# npm — installs only the cpd command
npm install -g cpd

Prebuilt binaries for 6 platforms — no Node.js runtime required.

crates.io

cargo install jscpd

Installs both jscpd and cpd binaries.

Nix

# Run without installing
nix run github:kucherenko/jscpd -- /path/to/code

# Install permanently
nix profile install github:kucherenko/jscpd

Homebrew

brew install jscpd

From source

git clone https://github.com/kucherenko/jscpd.git
cd jscpd/rust
cargo build --release
# binaries at target/release/jscpd and target/release/cpd

Quick Start

cpd .
cpd ./src ./lib
cpd . --blame --reporters console-full
cpd . --reporters json,html
cpd . --threshold 10
cpd --list

Architecture

jscpd/cpd (CLI binary)
 ├── cpd-core      — Detection algorithm (Rabin-Karp rolling hash)
 ├── cpd-tokenizer — Language tokenization (223 formats)
 ├── cpd-finder    — File walking, orchestration, git blame
 └── cpd-reporter  — Output formatting (13 reporters)

Crate	Version	Purpose
cpd-core	0.1.3	Detection algorithm, rolling hash, models
cpd-tokenizer	0.1.3	Language tokenization (223 formats)
cpd-finder	0.1.4	File walking, orchestration, git blame
cpd-reporter	0.1.4	Output formatting (13 reporters)
jscpd	5.0.4	CLI binary and entry point

Programmatic Usage (Rust)

use cpd_finder::orchestrate::{RunConfig, run};

let config = RunConfig {
    paths: vec!["./src".into()],
    min_tokens: 50,
    ..Default::default()
};

let result = run(&config).unwrap();
println!("Found {} clones", result.clones.len());
println!("Analyzed {} files", result.statistics.total.sources);

Building

Requires Rust 1.87+ (see rust-toolchain.toml).

cargo build --release
cargo test

Documentation

• docs/rust.md — Full CLI reference, all options, reporters, config file, differences from v4
• docs/typescript.md — TypeScript/Node.js engine (v4.x) documentation
• docs/ai-ready.md — AI reporter, agent skills, MCP server
• docs/api.md — Programming APIs (TypeScript and Rust)

Known Differences from jscpd v4

Feature	jscpd v4 (Node.js)	cpd v5 (Rust)
--store (LevelDB)	Persistent store for large repos	Not supported
Programming API	jscpd() Promise, detectClones()	Rust crate API; no Node.js API
--reporters	All v4 reporters	All except full (use console-full)

See docs/rust.md for the full differences table.

License

MIT