This disables the language server for Markdown files, which can be useful for performance in large documentation projects. You can configure this globally in your `~/.zed/settings.json` or inside a `.zed/settings.json` in your project directory.

## Formatting and Linting

Zed provides support for code formatting and linting to maintain consistent code style and catch potential issues early.

### Configuring Formatters

Zed supports both built-in and external formatters. See [`formatter`](./configuring-zed.md#formatter) docs for more. You can configure formatters globally or per-language in your `settings.json`:

```json
"languages": {
  "JavaScript": {
    "formatter": {
      "external": {
        "command": "prettier",
        "arguments": ["--stdin-filepath", "{buffer_path}"]
      }
    },
    "format_on_save": "on"
  },
  "Rust": {
    "formatter": "language_server",
    "format_on_save": "on"
  }
}
```

This example uses Prettier for JavaScript and the language server's formatter for Rust, both set to format on save.

To disable formatting for a specific language:

```json
"languages": {
  "Markdown": {
    "format_on_save": "off"
  }
}
```

### Setting Up Linters

Linting in Zed is typically handled by language servers. Many language servers allow you to configure linting rules:

```json
"lsp": {
  "eslint": {
    "settings": {
      "codeActionOnSave": {
        "rules": ["import/order"]
      }
    }
  }
}
```

This configuration sets up ESLint to organize imports on save for JavaScript files.

To run linter fixes automatically on save:

```json
"languages": {
  "JavaScript": {
    "code_actions_on_format": {
      "source.fixAll.eslint": true
    }
  }
}
```

### Integrating Formatting and Linting

Zed allows you to run both formatting and linting on save. Here's an example that uses Prettier for formatting and ESLint for linting JavaScript files:

```json
"languages": {
  "JavaScript": {
    "formatter": {
      "external": {
        "command": "prettier",
        "arguments": ["--stdin-filepath", "{buffer_path}"]
      }
    },
    "code_actions_on_format": {
      "source.fixAll.eslint": true
    },
    "format_on_save": "on"
  }
}
```

### Troubleshooting

If you encounter issues with formatting or linting:

1. Check Zed's log file for error messages (Use the command palette: `zed: open log`)
2. Ensure external tools (formatters, linters) are correctly installed and in your PATH
3. Verify configurations in both Zed settings and language-specific config files (e.g., `.eslintrc`, `.prettierrc`)

## Syntax Highlighting and Themes

Zed offers customization options for syntax highlighting and themes, allowing you to tailor the visual appearance of your code.

### Customizing Syntax Highlighting

Zed uses Tree-sitter grammars for syntax highlighting. Override the default highlighting using the `experimental.theme_overrides` setting.

This example makes comments italic and changes the color of strings:

```json
"experimental.theme_overrides": {
  "syntax": {
    "comment": {
      "font_style": "italic"
    },
    "string": {
      "color": "#00AA00"