YAML Validator
YAML Validator calls yaml.load and returns Valid YAML when parsing succeeds. It checks the library's accepted YAML syntax and schema only; it does not validate required application properties, Kubernetes or CI schemas, duplicate-key policies beyond library behavior, secret safety, style, comments, multi-file references, or deployment semantics. Parser errors are passed through the runner.
Runs locally — files stay on your deviceDoes Valid YAML mean my application will accept it?
No. It means js-yaml parsed it.
Syntax validity and configuration validity differ
YAML grammar can produce a data value even when that value violates the destination system's schema or security requirements.
How it works
The entire text is passed to yaml.load; success produces a fixed validity message and failure throws.
Key concepts
Library schema
Scalar interpretation follows js-yaml defaults.
No business schema
Required keys and ranges are unknown.
When to use it
- Catch basic indentation or token errors.
- Confirm a small document parses with js-yaml.
- Separate YAML syntax issues from later schema issues.
When not to use it
- Do not use it as Kubernetes/OpenAPI validation.
- Do not assume parsed values have intended types.
- Do not reveal secrets in shared diagnostic output.
Worked examples
Mapping
- Input
name: Ana- Expected output
Valid YAML.
Simple syntax parses.
Indent error
- Input
Misaligned nested values- Expected output
Parser error
Invalid structure can fail.
Wrong config key
- Input
valid_typo: true- Expected output
Valid YAML.
Application meaning is not checked.
Common mistakes
Calling it schema validation
No schema contract is supplied. Correction: Use the destination validator.
Assuming types
Scalar interpretation can surprise. Correction: Inspect parsed data and quote intentionally.
Treating valid as safe
Values can still be malicious. Correction: Apply security policy.
Best practices
- Validate syntax first, destination schema second.
- Pin expected YAML behavior in production.
- Test the actual consumer.
Related operations and differences
JSON Validator
Choose JSON Validator when you need to validate JSON and report syntax errors.; use YAML Validator specifically for yaml validate.
JSON to YAML
Choose JSON to YAML when you need to convert JSON data into readable YAML.; use YAML Validator specifically for yaml validate.
YAML Formatter
Choose YAML Formatter when you need to format YAML with consistent indentation.; use YAML Validator specifically for yaml validate.
YAML to JSON
Choose YAML to JSON when you need to convert YAML data into formatted JSON.; use YAML Validator specifically for yaml validate.
Compare JSON
Choose Compare JSON when you need to show value differences between two JSON documents.; use YAML Validator specifically for yaml validate.
CSV Column Extractor
Choose CSV Column Extractor when you need to extract one CSV column by header name.; use YAML Validator specifically for yaml validate.
Limitations and privacy
- js-yaml parse only.
- No application schema, style lint, comments review, secret scan, custom policy, deployment test, or semantic guarantee.
The pasted data is parsed and transformed locally in this browser.
Frequently asked questions
Does it format YAML?
No.
Does it validate Kubernetes resources?
No.
Are comments checked?
No.
Can valid YAML still be wrong?
Yes.