YAML Validator Online - Free YAML Checker

Paste YAML, run validation, and quickly find syntax errors with exact line numbers.

YAML Editor

What Is YAML Validation?

YAML validation checks whether your YAML file follows proper syntax rules and can be parsed reliably. A YAML validator helps catch indentation mistakes, missing colons, broken lists, and malformed values before deployment.

Example: Valid YAML

app:
  name: YAML Studio
  enabled: true
  retries: 3
  endpoints:
    - /health
    - /metrics

Example: Invalid YAML

app:
  name: YAML Studio
  enabled true
  retries: [1, 2