Which YAML version is supported?

YAML 1.2 is supported, using the js-yaml library.

Are error line numbers accurate?

Yes. The parser reports the exact line and column numbers of detected errors.

No. All processing happens in your browser.

No. This tool only validates YAML syntax. Compliance with a specific schema is not checked.

Yes. YAML can be syntactically valid but differ from what an application expects. This tool performs syntax checks only.

Validate YAML syntax. Shows error message with line and column numbers if invalid. Free.

YAML Input

Output

Enter YAML and click 'Validate'

Which YAML version is supported?: YAML 1.2 is supported, using the js-yaml library.
Are error line numbers accurate?: Yes. The parser reports the exact line and column numbers of detected errors.
Is my data sent to a server?: No. All processing happens in your browser.
Is schema validation (YAML schema) supported?: No. This tool only validates YAML syntax. Compliance with a specific schema is not checked.
Can a YAML that passes validation still be unusable?: Yes. YAML can be syntactically valid but differ from what an application expects. This tool performs syntax checks only.

Last Updated: 2026-02-21