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YAML Formatter & Validator

Format and validate YAML with helpful error messages

Settings

YAML Input

Formatted Output

Features

  • Validation: Check YAML syntax with detailed error messages
  • Formatting: Beautify YAML with consistent indentation
  • Error highlighting: Shows exact line numbers for errors
  • Multiple styles: Choose between block and flow styles
  • Real-time validation: Updates as you type
  • Custom indentation: 2 or 4 space indentation

Common YAML Rules

  • Indentation: Use spaces, not tabs
  • Colons: Space required after colon in mappings
  • Lists: Start with dash and space "- item"
  • Strings: Quote if contains special characters
  • Comments: Start with # symbol
  • Documents: Separate with --- delimiter