YAML Validator & Formatter

Paste your YAML below to instantly check for errors and reformat with clean, consistent indentation.

Input YAML
Formatted Output

How to use the YAML Validator

Paste your YAML into the left panel and click Validate & Format. The tool will parse your YAML using the same engine used in production-grade tools, report any syntax errors with line references, and output a cleanly formatted version in the right panel.

🔍 What it checks

  • Invalid indentation
  • Missing colons or quotes
  • Duplicate keys
  • Malformed anchors & aliases
  • Tab characters (not allowed in YAML)

✨ What it formats

  • Consistent 2 or 4-space indentation
  • Proper quoting of special strings
  • Clean list and map formatting
  • Resolved anchors in output

💡 Common use cases

  • Debugging GitHub Actions workflows
  • Formatting Kubernetes manifests
  • Cleaning up Docker Compose files
  • Validating Ansible playbooks