About YAML Formatter

Format and validate YAML online with clear diagnostics, duplicate key detection, and optional AI fix or explain.

How it works

Paste YAML into the editor and format it with configurable indent size (2 or 4 spaces). Validation checks for syntax errors and duplicate keys, surfacing clear diagnostics.

If your YAML has issues, click AI Fix or AI Explain for assistance. The default path uses deterministic local parsing without AI.

Key features

  • Deterministic formatting with configurable indent.
  • Syntax validation with duplicate key detection.
  • Optional AI fix and explain modes.
  • No login or server-side storage.