YAML can be validated using JSON Schema/OpenAPI, and somebody does maintain Kubernetes schema definitions, including Kustomize, which can then be used in an IDE

YAML can be validated using JSON Schema/OpenAPI, and somebody does maintain Kubernetes schema definitions, including Kustomize, which can then be used in an IDE for live validation. For example, the Kubernetes extension for VSCode does this. If you use Helm, writing and validating schemas for Helm value files is trickier, and not something I believe anyone is doing. It should be easier to do. Ideally you should simply put this at the top of a value file: $schema: ./schema.yaml But from what I know, there's no editor/extension, that supports validating through such a declaration. Secondly, Helm doesn't have a way to statically analyze value access. Something like {{ .Values.missTypedKey }} will only be caught when you generate the manifests.