Helm Values Validator
Validate Helm chart values.yaml against values.schema.json online. 100% client-side.
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What is Helm Values Validator?
Helm Values Validator is a free online tool that checks your Helm chart values.yaml file against its values.schema.json before you package or install the chart. It parses YAML client-side, applies full JSON Schema draft-07 validation, and reports every violation with its exact path.
Key Benefits
- Catch broken values before helm install or helm package fails
- No data leaves your browser — perfect for proprietary charts
- Precise error paths speed up debugging of complex values trees
- Works offline once the page is loaded
Common Use Cases
- •Validating chart values before a release cut
- •Reviewing values overrides in pull requests
- •Debugging "values don't match the schema" CI failures
- •Learning JSON Schema by testing against a sample chart
How to Validate Helm Values
- Paste values.yaml: Paste your Helm chart values into the left editor. Anchors and comments are fine.
- Paste values.schema.json: Paste your JSON Schema into the right editor. Draft-07 is recommended.
- Validate: Click "Validate values" to parse the YAML and run schema validation.
- Review errors: Fix each reported path (e.g. /image/tag), then re-validate until the result is green.
Key Features
- Validate values.yaml against values.schema.json
- Full JSON Schema draft-07 support (the version Helm uses)
- YAML parsing with anchors, merge keys, and comments
- Path-level error reporting with keyword badges
- Grouped error summary to spot systemic issues
- Copyable validation report for CI and pull requests
Frequently Asked Questions
Does the tool send my chart values anywhere?
No. YAML parsing and JSON Schema validation both run entirely in your browser using WebAssembly-free JavaScript libraries. Nothing is uploaded to any server.
Which JSON Schema draft is supported?
Draft-07 is recommended because it is the version Helm itself uses for values.schema.json. The bundled Ajv engine also handles draft-04 and draft-06 schemas in most cases.
Why does Helm reject values that pass here?
Helm validates values at packaging time with its own draft-07 engine, so results should match. If they differ, check that you validated against the exact schema file shipped in your chart, not a modified copy.
Can I validate multi-document YAML?
The parser handles anchors, merge keys, and multi-document YAML, but schema validation applies to a single values object. For multi-document files, validate each document separately.