Opinionated Code Formatter.

Prettier is an opinionated code formatter. It enforces a consistent style by parsing your code and re-printing it with its own rules that take the maximum line length into account, wrapping code when necessary.

• Prettier @ GitHub.

Related contents:

• Birth of Prettier @ Vjeux.

A PostgreSQL SQL syntax beautifier that can work as a console program or as a CGI.

This SQL formatter/beautifier supports keywords from SQL-92, SQL-99, SQL-2003, SQL-2008, SQL-2011 and PostgreSQL specifics keywords. Works with any other databases too.

• pgFormatter @ GitHub.

mbake is a Makefile formatter and linter. It only took 50 years!

Keep your code spotless.

Spotless can format <A ntlr | c | c# | c++ | css | flow | graphql | groovy | html | java | javascript | json | jsx | kotlin | less | license headers | markdown | objective-c | protobuf | python | scala | scss | shell | sql | typeScript | vue | yaml | anything> using <gradle | maven | sbt | anything>.

A collection of reusable rules and knowledge documents for AI coding assistants like Claude Code and Cursor.

Pretty print your Ruby objects with style -- in full color and with proper indentation.

AmazingPrint is a fork of AwesomePrint, which became stale, and should be used in its place to avoid conflicts. It is a Ruby library that pretty prints Ruby objects in full color, exposing their internal structure with proper indentation. Rails ActiveRecord objects and usage within Rails templates are supported via included mixins.

Dockerfile formatter, and a modern version of dockfmt. Built on top of the internal buildkit parser.

The tooling that enables ESLint and Prettier to support TypeScript.

• typescript-eslint @ GitHub.

Related contents:

• Avoiding anys with Linting and TypeScript @ typescript-eslint.

An extremely fast Python linter and code formatter, written in Rust.

• Ruff @ GitHub.

Related contents:

• Episode #660: Reinventing Python tooling with Rust @ Changelog Interviews.

The Universal Code Beautifier.

Single beautifier abstracting multiple beautifiers for multiple languages.

• Unibeautify @ GitHub.

One toolchain for your web project. Format, lint, and more in a fraction of a second.

Biome is a performant toolchain for web projects, it aims to provide developer tools to maintain the health of said projects.

Biome is a fast formatter for JavaScript, TypeScript, JSX, and JSON that scores 96% compatibility with Prettier.

Biome is a performant linter for JavaScript, TypeScript, and JSX that features more than 170 rules from ESLint, TypeSCript ESLint, and other sources. It outputs detailed and contextualized diagnostics that help you to improve your code and become a better programmer!

• Biome @ GitHub.

Related contents:

• Migrating A JavaScript Project from Prettier and ESLint to BiomeJS @ AppSignal.

Unified developer tools for JavaScript, TypeScript, and the web.

Rome unifies your development stack by combining the functionality of separate tools. Single configuration file, amazing performance, and works with any stack.

Rome @ GitHub.

The Ruby Linter/Formatter that Serves and Protects.

RuboCop is a Ruby code style checker (linter) and formatter based on the community-driven Ruby Style Guide.

RuboCob @ GitHub.