YAML validator
Validate & format your YAML
Catch indentation and syntax mistakes with a precise error line, then clean up your config or convert it to JSON — all in your browser.
Input · YAML
Formatted YAML
Paste YAML to validate and format it.
Frequently asked questions
What does the validator check?
It parses your YAML and reports the exact line and column of any syntax or indentation error.
Can it convert YAML to JSON?
Yes. Valid YAML can be copied as JSON with one click.
Is my YAML sent to a server?
No. Validation and formatting run in your browser.