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YAML formatting guide
Paste YAML into the formatter above to parse the document and rewrite it with consistent indentation. This is useful for deployment manifests, CI files, application configuration, and examples that have become hard to scan after manual edits. This tool is free to use. No account or payment is required.
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The formatter does not rearrange whitespace with regular expressions. It parses the YAML document first, so malformed indentation, duplicate mapping keys, and other syntax problems are reported instead of being silently rewritten.
After parsing succeeds, the document is serialized with consistent indentation. Comments associated with parsed nodes can remain in the formatted output.
Readable YAML makes nested mappings and sequences easier to inspect during code review, especially in Kubernetes manifests, GitHub Actions workflows, Compose files, and application configuration.
Formatting and parsing run locally in your browser. Imported YAML and pasted secrets, endpoints, or infrastructure settings are not sent to a VetaTool processing backend.
A flow-style array is expanded into readable block YAML while the parsed values stay unchanged.
app:
name: api
replicas: 3
ports: [8080, 8081]app:
name: api
replicas: 3
ports:
- 8080
- 8081Common questions
Formatting reserializes the parsed YAML data. It changes presentation such as indentation and sequence style, not the successfully parsed scalar values.
No. Syntax errors are reported so you can correct the source deliberately before it is formatted.
It formats a YAML document model rather than converting through JSON, so comments retained by the parser can remain in the output.
Debugging a specific YAML issue? Browse YAML troubleshooting.