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nixfmt: An opinionated formatter for Nix

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Deprecated

This is an old version of nixfmt that is not maintained anymore and deprecated in favor of the new official revision of it, which is not distributed on Hackage anymore, but available in Nixpkgs as pkgs.nixfmt-rfc-style and pkgs.nixfmt after 25.11. See the new repository readme for more information.

A formatter for Nix that ensures consistent and clear formatting by forgetting all existing formatting during parsing.

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Versions [RSS] 0.3.0, 0.4.0, 0.5.0, 0.6.0
Change log CHANGELOG.md
Dependencies base (>=4.12.0 && <4.19), cmdargs (>=0.10.20 && <0.11), directory (>=1.3.3 && <1.4), filepath (>=1.4.2 && <1.5), ghcjs-base (>=0.2.0 && <0.3), megaparsec (>=9.0.1 && <9.6), nixfmt, parser-combinators (>=1.0.3 && <1.4), safe-exceptions (>=0.1.7 && <0.2), scientific (>=0.3.0 && <0.4.0), text (>=1.2.3 && <2.2), unix (>=2.7.2 && <2.9) [details]
License MPL-2.0
Copyright 2022 Serokell, 2022 Lars Jellema
Author Lars Jellema
Maintainer lars.jellema@gmail.com
Revised Revision 1 made by infinisil at 2025-07-22T20:08:33Z
Category Development
Home page https://github.com/serokell/nixfmt
Bug tracker https://github.com/serokell/nixfmt/issues
Source repo head: git clone git://github.com/serokell/nixfmt.git
Uploaded by infinisil at 2023-10-31T21:53:32Z
Distributions NixOS:0.6.0
Executables js-interface, nixfmt
Downloads 1408 total (5 in the last 30 days)
Rating 1.75 (votes: 1) [estimated by Bayesian average]
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Status Docs uploaded by user
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Readme for nixfmt-0.6.0

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nixfmt

nixfmt is a formatter for Nix code, intended to easily apply a uniform style.

You are encouraged to test this out on your code and submit any undesirable formatting you find as an issue

Build Status

Installation

  • nixfmt is in nixpkgs master as of 2019-09-04:

    nix-env -iA nixpkgs.nixfmt

  • To get the most recent version, install from master:

    nix-env -f https://github.com/serokell/nixfmt/archive/master.tar.gz -i

  • Nix with flakes

    nix profile install github:serokell/nixfmt

Development

With Nix

Haskell dependencies will be built by Nix.

  • Enter nix-shell
  • Build with cabal new-build

Without Nix

Haskell dependencies will be built by Cabal.

  • Build with cabal new-build

Usage

  • nixfmt < input.nix – reads Nix code from stdin, formats it, and outputs to stdout
  • nixfmt file.nix – format the file in place

About Serokell

nixfmt is maintained and funded with ❤️ by Serokell. The names and logo for Serokell are trademark of Serokell OÜ.

We love open source software! See our other projects or hire us to design, develop and grow your idea!