The Prettier plugin for Obsidian integrates Prettier's automatic code formatting capabilities directly into your Obsidian environment. This plugin supports multiple languages and formats, including Markdown, MDX, JavaScript, TypeScript, HTML, JSON, and more. It can format entire documents or selected content and offers automatic formatting on save or file change. Users can configure various formatting options such as tab width, semicolons, and trailing commas, and the plugin supports ignoring specific files or directories. It also provides customizable settings for formatting code blocks and removing unnecessary spaces in lists, ensuring a clean and consistent writing experience.