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Kubernetes YAML Validator

Validate Kubernetes YAML manifests — check pods, deployments, services, and more for correct structure and required fields.

Kubernetes YAML Manifest

Validation Results

What Is a Kubernetes YAML Validator?

A Kubernetes YAML validator checks the structure and required fields of Kubernetes manifest files before you apply them to a cluster. K8s manifests define the desired state of pods, deployments, services, and other resources. Missing fields like apiVersion, kind, or metadata.name cause apply failures. Our K8s YAML linter catches these issues instantly in your browser.

Common Kubernetes Resource Validations

Deployment

Requires spec.replicas, spec.selector.matchLabels, spec.template.metadata.labels, and spec.template.spec.containers.

Service

Requires spec.ports and spec.selector to route traffic to pods.

Pod

Requires spec.containers with at least one container definition.

ConfigMap / Secret

Requires data (ConfigMap) or data/stringData (Secret).

How to Use This K8s Validator

Paste your Kubernetes YAML manifest into the textarea and click Validate. The tool parses the YAML and checks each resource against Kubernetes schema rules. Valid fields show a green checkmark, while missing or invalid fields show a red cross with an explanation. Use Load Example to see a sample Deployment manifest, and Clear to reset. All processing is client-side — your manifests never leave your device.

Tips for Valid K8s Manifests

Always set apiVersion — Use the correct version for the resource type (e.g., apps/v1 for Deployment, v1 for Pod).
Use valid kinds — Common kinds include Pod, Deployment, Service, ConfigMap, Secret, Ingress, PersistentVolumeClaim, Namespace.
Match labels correctly — spec.selector.matchLabels must match spec.template.metadata.labels for Deployments.
Container images should be explicit — Always specify the image tag, not just the image name (e.g., nginx:1.25 not nginx).
Validate before apply — Use --dry-run=client or this validator to catch errors before reaching the cluster.

How to Do This in Code

kubectl apply --dry-run=client -f manifest.yaml
kubectl explain pod
kubectl create deployment test --image=nginx --dry-run=client -o yaml

const yaml = require('js-yaml');
const fs = require('fs');
const doc = yaml.load(fs.readFileSync('pod.yaml', 'utf8'));
console.log(doc.apiVersion, doc.kind);

import yaml
with open('deployment.yaml') as f:
    data = yaml.safe_load(f)
print(data['apiVersion'], data['kind'])

import ("os"; "sigs.k8s.io/yaml")

data, _ := os.ReadFile("deploy.yaml")
out, _ := yaml.YAMLToJSON(data)
fmt.Println(string(out))

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Kubernetes YAML Validator FAQ

What does this Kubernetes YAML validator check?

It validates YAML syntax and checks that your Kubernetes manifest has the required fields (apiVersion, kind, metadata.name), valid resource kinds, and correct structural patterns for common resources like Pods, Deployments, Services, ConfigMaps, and Namespaces.

Can I validate live Kubernetes manifests?

This tool validates YAML syntax and K8s structure client-side. For live validation against your cluster's API server, use kubectl apply --dry-run=server.

Is my manifest data safe?

Yes. All processing happens client-side in your browser. Your manifest data never leaves your device.

What Kubernetes resource kinds are supported?

Common kinds like Pod, Deployment, Service, ConfigMap, Secret, Namespace, Ingress, PersistentVolume, PersistentVolumeClaim, ServiceAccount, Role, RoleBinding, and more are recognized with their required fields.