version is not SemVer
version: 1.4
Helm requires a SemVer 2 version such as 1.4.0. helm package fails before you even reach the cluster.
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Helm chart validator
Paste your Chart.yaml, a values.yaml or a rendered template and check it before helm install: the chart metadata, its dependencies and the Kubernetes objects it produces.
Helm
YAML
Paste a file on the left to validate it.
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What YAMLTools checks in your Helm file
- Chart.yaml: apiVersion v2, name, version as SemVer, type and appVersion.
- Dependencies with a name, a valid version range and a repository (https:// or oci://).
- values.yaml: image tags written as numbers (1.20 is read as 1.2) and empty securityContext or resources blocks.
- The output of helm template: paste it and it is detected and validated as Kubernetes manifests.
- Templates with {{ }} actions are recognised as templates, so their syntax is not reported as broken YAML.
Risks it flags
- Images on :latest or without a tag in values.
- Empty securityContext in values, so containers keep the most permissive defaults.
- Empty resources in values: no requests or limits by default.
- Once rendered: privileged containers, running as root and plaintext secrets, with the Kubernetes rules.
- Once rendered: workloads without probes or with a single replica.
Common Helm errors
The ones that break a deploy most often, and how YAMLTools reports them.
Dependency without repository
dependencies:
- name: redis
version: 19.6.4helm dependency update does not know where to download it from. YAMLTools points to the dependency that needs one.
Validating a raw template
image: {{ .Values.image.repository }}A template is not valid YAML until it is rendered. Render it with helm template and paste the output to validate the objects.
Your file stays on your computer
Validation, risk analysis, diagram and conversions run in your browser. Nothing is uploaded unless you decide to save it with an account.
Helm chart validator FAQ
Charts, templates and values.