nixfmt ☆

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Description:
Command-line tool to format Nix language code

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: nix formatter developer-tools cli code-style

Install: brew install nixfmt

About:
Nixfmt is a command-line interface tool designed to format Nix language files according to a consistent style. It parses Nix expressions and re-outputs them with standardized indentation and layout, making code easier to read and maintain. This tool helps enforce uniformity across Nix projects, reducing time spent on manual formatting during code reviews.

Key Features:

Idempotent formatting: Running the tool multiple times produces the same output
Standard compliance: Adheres to the official Nix language syntax
CLI integration: Works with stdin/stdout for easy editor and CI integration
Fast execution: Optimized for large Nix files and repositories

Use Cases:

Enforcing consistent code style in Nixpkgs and other Nix-based projects
Automating formatting in CI/CD pipelines to prevent style drift
Quickly reformatting legacy or manually written Nix files

Alternatives:

nixpkgs-fmt – Another popular Nix formatter with slightly different style choices; nixfmt is often preferred for its strict adherence to a unified style.
alejandra – A newer formatter focusing on speed and a unique formatting algorithm; nixfmt is more established and widely used in the official Nix ecosystem.

Version History

Detected	Version	Rev	Change	Commit
Sep 16, 2025 5:08pm		0	VERSION_BUMP	101d4d38