YAML
Validate, convert and synchronize YAML and JSON
YAML Validator & Linter: Validate YAML, Convert to JSON Online
YAML syntax is checked instantly by this YAML validator and conversions between YAML and JSON are done with live synchronization. YAML is popular for Kubernetes manifests, Docker Compose files, and CI/CD pipelines, but its indentation-sensitive syntax makes bugs easy to introduce and hard to spot. Indentation errors, type coercion issues, and syntax problems are caught before deployments are broken. This tool can also be used as a YAML linter or yaml lint tool.
Converting between YAML and JSON
YAML and JSON represent the same data structures differently. Sometimes a YAML config needs to be converted to JSON for an API call, or JSON API output needs to be turned into a YAML file. This converter handles both directions with proper type mapping — booleans stay booleans, numbers stay numbers, and multiline strings are preserved.
Common YAML pitfalls
YAML has several gotchas that catch developers off guard. The value "no" becomes a boolean false. Tabs instead of spaces cause parse failures. Unquoted strings containing colons break silently. These edge cases are caught and explained in plain language.