Helm Lint Checker
Lint Helm chart templates and values.yaml in your browser: missing required values, unbalanced template braces, and YAML errors with per-line diagnostics. Free.
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What is Helm Lint Checker?
Helm Lint Checker validates Helm chart authoring entirely in your browser: it parses your values.yaml with js-yaml, scans templates for unbalanced Go-template braces and unterminated strings, and resolves every .Values reference against your values - reporting each finding with a line number and severity.
Key Benefits
- Catch missing values before helm install explodes mid-deploy
- Per-line diagnostics point straight at the broken brace or key
- required() references are enforced as hard errors
- default fallbacks are flagged for review instead of silently applying
- Chart contents stay local - nothing is uploaded or rendered on a server
Common Use Cases
- •Pre-flight checking templates and values before a release
- •Debugging a failed helm install caused by a missing key
- •Reviewing chart pull requests for value-reference mistakes
- •Teaching Helm template syntax with immediate feedback
How to Lint a Helm Chart
- Paste values.yaml: Add the values file the chart will render with, so references can be resolved.
- Paste the template: Add the template file - braces, strings, and value references are checked line by line.
- Fix the diagnostics: Work through errors and warnings by line number until the checker reports no issues.
Key Features
- values.yaml parsed with js-yaml, including tab-indentation detection
- Balanced-brace scanning across all Go template actions
- Values references resolved against your pasted values.yaml
- required() missing keys are errors; default fallbacks are warnings
- Per-line, severity-coded diagnostics with error and warning counts
- 100% in-browser - chart contents never leave your device