alejandra ☆

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Description:
Command-line tool for formatting Nix Code

Type: Formula | Latest Version: 4.0.0@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: nix formatter developer-tools rust nixos

Install: brew install alejandra

About:
Alejandra is an opinionated and extremely fast code formatter for the Nix language. It ensures consistent and readable Nix code by enforcing a specific style guide, which helps teams maintain clean and uniform codebases. The tool is written in Rust, providing excellent performance and reliability for large Nix projects.

Key Features:

Extremely fast formatting written in Rust
Opinionated style for consistency
Supports formatting NixOS configurations and flakes
Easy integration with CI/CD pipelines

Use Cases:

Enforcing a consistent coding style across a team's Nix projects
Automating Nix code formatting in pre-commit hooks or CI pipelines
Improving readability of complex Nix expressions in flakes or modules

Alternatives:

nixpkgs-fmt – Alejandra is opinionated and focuses on speed, while nixpkgs-fmt offers more configuration options.
nixfmt – Alejandra is generally considered faster and has a more distinct, enforced style.

License: Unlicense

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, sonoma, ventura, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Sep 13, 2025 11:25am		0	VERSION_BUMP	e160d40c