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YAML Formatter & Validator

Format, validate, and convert between YAML and JSON

Input YAML or JSON
Output Result

Features

  • Format and beautify YAML with proper indentation
  • Validate YAML syntax (catches indentation and structure errors)
  • Convert YAML ↔ JSON in both directions
  • Works on Kubernetes manifests, Docker Compose, GitHub Actions, OpenAPI specs
  • Browser-based, no upload, your data never leaves your computer

Why use it

  • YAML is whitespace-sensitive — one wrong indent breaks everything; this tool surfaces line numbers on errors
  • Mixed teams often need to flip between YAML and JSON for tooling compatibility