prettier

What is prettier?

Prettier is an opinionated code formatter that supports many languages and integrates with most editors. It removes all original styling and ensures that all outputted code conforms to a consistent style.

What are prettier's main functionalities?

Code Formatting

Formats all .js files in the src directory and its subdirectories. When run, this command will process each JavaScript file and reformat it according to Prettier's rules.

prettier --write 'src/**/*.js'

Configuration Overrides

Allows customization of Prettier's default formatting rules. For example, this JSON configuration disables semicolons at the end of statements and enforces single quotes.

{
  'semi': false,
  'singleQuote': true
}

Ignoring Code

You can prevent a section of code from being formatted by Prettier by adding a special comment, `// prettier-ignore`, before it.

// prettier-ignore
let untouched = 'This code will not be formatted by Prettier.';

Integration with Editors

Prettier can be integrated into many code editors to automatically format files on save or during editing, enhancing the developer's workflow.

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Support for Multiple Languages

Prettier supports a wide range of languages and frameworks, including but not limited to JavaScript, TypeScript, CSS, HTML, and Markdown, making it a versatile tool for many developers.

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Other packages similar to prettier

eslint

ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code, with the ability to fix many issues automatically. While it can also format code, its primary focus is on code quality and adherence to coding standards, unlike Prettier which is solely focused on code formatting.

stylelint

Stylelint is a modern linter that helps you avoid errors and enforce conventions in your stylesheets. It is to CSS what ESLint is to JavaScript, and while it can fix code style issues, it is more focused on maintaining code quality rather than just formatting.

beautify

Beautify, available as 'js-beautify' for npm, is a code beautifier that can format HTML, CSS, and JavaScript. It is less opinionated than Prettier and offers more configuration options, but it might not enforce as consistent a style as Prettier does.

standard

Standard is a JavaScript style guide, linter, and formatter that enforces a strict coding standard. Unlike Prettier, Standard also includes rules that aim to prevent bugs and improve code clarity.

README

Opinionated Code Formatter

JavaScript · Flow · TypeScript · CSS · SCSS · Less · GraphQL · JSON · Markdown

Intro

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.

Input

foo(reallyLongArg(), omgSoManyParameters(), IShouldRefactorThis(), isThereSeriouslyAnotherOne());

Output

foo(
  reallyLongArg(),
  omgSoManyParameters(),
  IShouldRefactorThis(),
  isThereSeriouslyAnotherOne()
);

Prettier can be ran in your editor on-save, in a pre-commit hook, or in CI environments to ensure your codebase has a consistent style without devs ever having to post a nit comment on a code review ever again!

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Documentation

Install · Options · CLI · API

Playground

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Badge

Show the world you're using Prettier →

[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)

Contributing

See CONTRIBUTING.md.

Changelog

1.8.1

diff

• Force JSON to no trailing comma in multiparser (#3182 by azz)
• Don't add trailing commas in JSXAttribute for arrow functions (#3181 by duailibe)
• Markdown: Allow more cases that _-style emphasis is available (#3186 by ikatyang)
• Markdown: Handle additional spaces before code (#3180 by ikatyang)
• Markdown: Do not break on unbreakable place (#3177 by ikatyang)
• Markdown: Do not break before special prefix (#3172 by ikatyang)