YAML Formatter & Validator
Format, beautify, validate YAML and convert between YAML and JSON. Free, instant, runs entirely in your browser.
FAQ
What is YAML?
YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used for configuration files (Docker Compose, Kubernetes, CI/CD pipelines). It uses indentation to represent structure.
How does YAML differ from JSON?
YAML uses indentation instead of braces, supports comments with #, and is generally more human-readable. JSON is stricter and more widely supported by APIs. Both can represent the same data structures.
What does this tool validate?
It checks that your YAML is syntactically correct — proper indentation, valid data types, correct use of colons, dashes, and quotes. Any parsing errors are shown with line numbers.
Can I convert YAML to JSON and back?
Yes! Use the YAML → JSON tab to convert YAML to JSON, or the JSON → YAML tab to convert JSON to YAML. Both conversions preserve data types and nested structures.
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