Developer ToolsCode FormattersFree Tool
YAML Formatter
Reindent YAML based on key and list-item structure, applying consistent 2-space nesting.
How to Use YAML Formatter
- 1Paste your YAML content
- 2Click Process
- 3Copy the reindented output
Frequently Asked Questions
It scans line by line, increasing indent by one level (2 spaces) whenever a line ends with a colon (a new key/mapping) or starts a list item with a dash, and applies that running indent level to each subsequent line.
No — this only reformats indentation; it doesn't check for invalid YAML syntax, tab usage, or type errors. Use the YAML Validator tool for basic structural checks.
Yes — lines starting with # are passed through as-is at their current position in the structure.
It's a heuristic line-based approach, not a full YAML parser — very complex YAML (anchors/aliases, flow-style collections, multi-document separators) may not reindent perfectly. For guaranteed-correct results, use a dedicated YAML library or your IDE's formatter.
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