YAML Validator
Check Kubernetes manifests, CI configs, and app settings with this free YAML validator. Paste your document to see whether the syntax is valid - errors include line and column so you can fix indentation issues fast.
YAML’s whitespace-significant syntax trips up even experienced engineers. Tab indentation is called out by name instead of a generic parse error. This client-side checker never uploads your secrets-bearing config files.
Input
Paste or type your content here…
Results
Paste YAML to check it for syntax errors.
Frequently Asked Questions
Why is indentation so important in YAML?
YAML uses indentation (not braces) to define structure. Mixing tabs and spaces or mis-aligning list items is the most common failure mode this validator catches.
Does validation execute any code?
No. We parse with js-yaml into data structures only. There is no code execution step.
Can I validate multi-document YAML?
Yes. Documents separated by --- are loaded with loadAll. Open View as JSON to confirm how implicit types such as yes/no were interpreted.
How is this different from YAML to JSON?
The validator focuses on syntax success and error location. YAML to JSON is for conversion when you already have valid input.