Prettier

Prettier is an opinionated code formatter that supports JavaScript, TypeScript, Flow, JSX, JSON, CSS, SCSS, Less, HTML, Vue, Angular, GraphQL, Markdown, and YAML. Current stable version is 2.x (latest 2.3.2), with a dev version 2.4.0-dev available. It enforces consistent style by parsing code and reprinting with its own rules, wrapping based on line length. Key differentiators: it eliminates debates over code style, has wide ecosystem support (editor integrations, pre-commit hooks, CI), and is extensible via plugins. Releases are frequent, and it is actively maintained by the Prettier community.