Validate Kubernetes YAML — Structural Checks

Validate Kubernetes manifests with structural browser checks: apiVersion, kind, metadata, and kind-specific rules for common resources. Not kubeconform, kubectl dry-run, or full OpenAPI schema validation against a cluster.

Kubernetes YAML

0chars0 B1lines

Validation results

Paste Kubernetes manifests — the verdict appears in this results panel when structural validation settles.

Structural validation runs locally — nothing is uploaded. Not kubeconform or kubectl dry-run.

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Kubernetes YAML validator — structural checks

Catch missing fields and common shape mistakes in manifests before CI. Honest subset: not full schema or live-cluster validation.

Developer notes

• Parses with js-yaml loadAll; validates structure in the browser. • Checks shared fields (apiVersion, kind, metadata.name) plus kind-specific rules for a curated subset. • Not kubeconform, kubectl --dry-run, or OpenAPI schema from an apiserver. • Live debounced validation (~300 ms) in the Monaco YAML editor. • Max input 512 KB. • Results panel: verdict banner, document/kind stats, issue cards with doc index and line hints.

When teams pick this route

• Spot a missing selector or container list on a pasted Deployment. • Sanity-check multi-doc YAML from kubectl get before sharing. • Teach manifest shape with immediate feedback. • Pair with format Kubernetes after fixing issues.

Worked examples

Valid multi-document stack (ConfigMap + Service + Deployment)

Input

apiVersion: v1
kind: ConfigMap
metadata:
  name: app-config
  namespace: web
data:
  LOG_LEVEL: info
---
apiVersion: v1
kind: Service
metadata:
  name: web
  namespace: web
spec:
  selector:
    app: web
  ports:
    - port: 80
      targetPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
  namespace: web
  labels:
    app: web
spec:
  replicas: 2
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: web
          image: nginx:1.27
          ports:
            - containerPort: 80

Validation result

Structurally valid — 3 documents, 3 kinds (ConfigMap, Service, Deployment), shared namespace web.

Missing metadata.name

Input

apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    app: web
data:
  key: value

Validation result

Invalid — metadata.name required (issue with document/line hint).

Navigate related Kubernetes tools

Pretty-print with format Kubernetes, scaffold resources via generate Deployment, or browse the Kubernetes hub.

Kubernetes validator FAQ

Structural scope only

Is this kubeconform or kubectl dry-run?

No. Checks are structural and kind-aware for a subset of fields in the browser. They do not load Kubernetes OpenAPI schemas or contact a cluster.

Does a valid result mean the manifest will apply?

No. Structural OK does not guarantee admission, RBAC, image pull, or API version availability on your cluster.

Are CRDs fully validated?

Custom resources get shared-field checks only unless a kind-specific rule exists. Treat CRDs carefully.

Multi-document files?

Yes — each non-null document is checked; issues can name the document index and line when available.

Kubernetes

Multi-doc manifests, structural validate, Ingress/Deployment starters, and Helm values formatting.

Format Kubernetes YAML

Generate Kubernetes Ingress

Generate Kubernetes Deployment

Format Helm values.yaml

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