YAML Formatter & Validator
Format, validate, and convert YAML to JSON instantly in your browser.
How to use this tool
Paste your YAML into the input box on the left, then click Format to normalize its indentation, Validate to check whether it's well-formed YAML, or Convert to JSON to see it as JSON. The result appears in the output box on the right, and any errors are shown below. Not sure where to start? Click Load sample to try an example. Switch on Auto update to re-run it as you type instead of clicking each time.
FAQ
Is this YAML formatter free to use?
Yes, this tool is completely free to use with no limits on how often you can use it.
Does my YAML data get uploaded anywhere?
No. All formatting, validation, and conversion happens directly in your browser. Your data never leaves your computer.
What happens if my YAML is invalid?
The tool shows a clear error message describing what's wrong, including the line and column where the problem was found.