codecrafters

Run tests without committing changes

$ codecrafters test

$ codecrafters test --previous

$ codecrafters submit

$ codecrafters update-buildpack

codecrafters <command> [<options>]

--help
    Print help information

--version
    Print version information

-v, --verbose
    Increase verbosity of output

--clear
    Clear screen before running tests

--no-color
    Disable colored output

--working-directory <DIR>
    Set working directory for command

Codecrafters is a powerful command-line interface (CLI) tool for the Codecrafters.io platform, where developers recreate popular software like Git, Redis, Docker, and SQLite from scratch in their preferred programming language. It streamlines challenge workflows by providing essential commands to scaffold projects, test implementations against official test suites, submit solutions for verification, and benchmark performance against reference implementations.

Users start by authenticating with codecrafters login, then clone repositories or scaffold new ones. The tool fetches test cases from the platform, runs them locally, and reports failures with detailed feedback. It's ideal for hands-on learning, interviews, and skill-building, supporting languages via Cargo, Homebrew, or direct binaries. Open-source and actively maintained, it ensures compatibility with evolving challenges.

Requires internet for login, tests, and submissions. Some challenges need specific language runtimes. Not all challenges support benchmarking.

Via Homebrew: brew install codecrafters/tap/codecrafters-cli
Via Cargo: cargo install codecrafters-cli

Run codecrafters login with GitHub account linked to Codecrafters.

1. codecrafters scaffold <challenge>
2. Implement code.
3. codecrafters test
4. codecrafters submit

Released in 2020 alongside Codecrafters platform launch. Developed by Puneet Wadhwa and team as Rust CLI. Frequent updates for new challenges; v0.50+ added multi-language support and improved benchmarking.

cargo(1), brew(1), git(1)