YAML Formatter
Format YAML config
What is YAML Formatter?
Format YAML, convert YAML to JSON, or convert JSON to YAML — all with live parse-error reporting. Useful for cleaning up config files, translating between formats when a tool expects one or the other (common in DevOps), or pretty-printing a Kubernetes manifest that arrived as a compact one-liner.
How do I use YAML Formatter?
- Paste YAML or JSON into the input panel.
- Choose a mode: Format YAML, YAML → JSON, or JSON → YAML.
- Set indent (2 or 4 spaces).
- Copy or download the output.
When should I use YAML Formatter?
YAML Formatter covers YAML↔JSON conversions. For XML-based configs instead, use XML Formatter / XML to JSON. For TOML, we don't ship a dedicated tool yet.
Does it validate YAML syntax?
Yes. Errors are highlighted inline with line and column numbers. The formatter uses js-yaml's strict parse mode.
Can I convert YAML to JSON?
Yes — toggle the output mode to JSON. Round-tripping is near-lossless: multi-document YAML becomes a JSON array; YAML tags are stripped.
What indentation does it use?
Two spaces by default (the YAML convention). Switch to four if you prefer; tabs are not allowed by the YAML spec and are rejected.
Is my file uploaded anywhere?
No. Everything runs in your browser. Your files never leave your device, and there is no server component for this tool.