0.18.1 • Public • Published


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Opinionated code formatter for TypeScript and JavaScript.


  • Prefer single quotes.
  • No semicolons.
  • Trailing commas for multi-line.
  • No function parentheses for arrow function with single argument.
  • Multi-line union and intersection use consistent leading separator.


Read exports/sane-fmt.typescript.json, src/rules.rs, and tests/rules.rs for more information.


Download prebuilt binaries

Go to the release page.

From crates.io

cargo install sane-fmt


From NPM

WASM (all platform)

npm i -g @sane-fmt/wasm32-wasi


Native binaries

The WASM package while work on all platform, it is slow to start. For better speed, install one of the following packages instead:

For Linux:

For macOS:

For Windows:

From Deno Registry


From Arch User Repository

Download source and compile

paru -S sane-fmt


Download prebuilt binary

paru -S sane-fmt-bin


Use with Dprint

If you already have Dprint, you can skip installing sane-fmt binary. Create a dprint.json file with the following content:

  "$schema": "https://dprint.dev/schemas/v0.json",
  "projectType": "openSource",
  "extends": "https://github.com/sane-fmt/sane-fmt/raw/master/exports/sane-fmt.dprint.json",
  "includes": [
  "excludes": [
  "plugins": [


  • Replace master in the "extends" line above with appropriate sane-fmt version.
  • Replace ${DPRINT_TYPESCRIPT_VERSION} above with appropriate dprint-plugin-typescript version.

See also:


Format all TypeScript and JavaScript files

sane-fmt --write

This command would reformat all TypeScript and JavaScript files.

Check for all TypeScript and JavaScript files


This command would check all TypeScript and JavaScript files.

Format only some files

sane-fmt --write foo.ts bar.js

This command would only reformat foo.ts and bar.js.

Format all TypeScript and JavaScript files in a directory

sane-fmt --write src/

This command would reformat all TypeScript and JavaScript files within src/ directory.

Check all TypeScript and JavaScript files in a list

Each line of list.txt is a path to a TypeScript/JavaScript file.

sane-fmt --include=list.txt

Check all TypeScript and JavaScript files from a Git repo

git ls-files | grep -Ei '\.(js|ts)$' | sane-fmt --include=-

GitHub Actions

sane-fmt also provides a convenient way to integrate with GitHub Actions. To use it, simply add --log-format=github-actions, like so:

sane-fmt --log-format=github-actions --details=diff

When this command is executed within a GitHub Actions runner, it will:

  • Annotates unformatted files.
  • Group diffs by file names (if --details=diff).
  • Export total, changed, and unchanged as outputs.

Recommendation: This action will install sane-fmt and execute it for you.

Print help message

sane-fmt --help

Shell Completions

If you installed sane-fmt via the AUR, completions for bash, fish, and zsh are already installed for you.

Shell completion files are located in ./exports directory of this repo or the Release Page with name in form of completion.<extension> where <extension> is corresponding file extension of target language. Install them to appropriate locations in your filesystem to use.

Become a Patron

My Patreon Page.

Frequently Asked Questions

What is this program?

sane-fmt is an opinionated code formatter for TypeScript and JavaScript powered by dprint. You can think of it as a portable Dprint config file that is always up-to-date.

What is the point of this program?

I want to apply a single, consistent formatting for all my codes regardless of environment without complex tooling.

I have considered using Prettier or Dprint, but that would mean having to set up Node.js even in non-Node.js environments. I also don't like copying my config files back-and-forth to update them.

On the other hand, setting up sane-fmt is simple: just download the binary.

How to customize the rules?

Customization is antithetical to the purpose of this project, and as such, the sane-fmt command does not have customization capability.

However, if you still want a copy of sane-fmt with your own customized rules, do one of the following:

  • Use sane-fmt as a library crate.
  • Fork this project.
  • Just use dprint.


MIT © Hoàng Văn Khải




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