Runs locally

YAML Formatter & Validator

Validate and format YAML configs in the browser with clear parser errors and copy-ready output.

Local processingYour input stays in this browser tab.

Input

Paste YAML to validate and format

0 charactersYAML

Output

Formatted YAML output

Formatted YAML appears here.
Waiting for YAML
How to validate YAML
Paste YAML into the input panel and choose Format YAML. The parser checks indentation, mappings, sequences, and scalar syntax locally before producing normalized two-space output.
Common YAML mistakes
  • Indented children must align consistently under the same parent.
  • Tabs are unsafe in YAML indentation; use spaces.
  • Colons in unquoted values can be interpreted as mappings.
  • Lists require consistent - indentation.