Format and validate YAML configuration files with instant feedback.
YAML is a human-readable data format that uses indentation instead of brackets, widely used for configuration files (Docker Compose, Kubernetes, GitHub Actions, Ansible). This tool formats and validates YAML entirely in your browser.
YAML ("YAML Ain't Markup Language") represents the same kinds of data as JSON — mappings, lists, scalars — but with a cleaner, indentation-based syntax and no required brackets or quotes for most values. It's a superset of JSON in most implementations.
Indentation defines structure in YAML the way brackets do in JSON — mixing tabs and spaces, or inconsistent indent levels, is one of the most common causes of YAML syntax errors.