📖 What is Kubernetes YAML Validator?
Kubernetes YAML Validator checks your K8s manifests for YAML syntax errors and common structural issues. Paste a Deployment, Service, ConfigMap, Ingress or other manifest and get instant validation feedback. Use it before applying manifests to a cluster to catch errors early. Everything runs in your browser.
💡 Example
Input
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-app
spec:
replicas: 3
Output
✓ Valid YAML syntax
⚠ Missing spec.selector (required for Deployments)
⚠ Missing spec.template
🛠️ Common Use Cases
- Validating YAML syntax before kubectl apply
- Catching missing required fields in K8s manifests
- Checking Deployment, Service and Ingress configurations
- Reviewing manifests during code review
- Learning Kubernetes manifest structure
📝 Common K8s Resources
Deployment — manages pod replicas and rolling updatesService — exposes pods with stable networkingConfigMap — stores non-sensitive configuration dataSecret — stores sensitive data (base64 encoded)Ingress — HTTP routing and load balancing
⚠️ Common Mistakes
- Tab indentation — YAML requires spaces, never tabs. Kubernetes rejects manifests with tabs.
- Missing selector — Deployments require spec.selector.matchLabels that matches the pod template labels
- Wrong apiVersion — API versions change between Kubernetes releases. Check your cluster version.
❓ Frequently Asked Questions
Does this validate against a specific Kubernetes version? ▾
This tool checks YAML syntax and common structural patterns. For version-specific API validation, use kubectl --dry-run=client or kubeval.
Can I validate multiple documents? ▾
YAML documents separated by --- are validated individually. Each document is checked for valid syntax and structure.
How do I fix "error validating data"? ▾
Check for missing required fields (like selector in Deployments), wrong apiVersion, or typos in field names. This tool highlights the most common issues.
Is my data private? ▾
Yes — all processing runs entirely in your browser. Your data is never sent to any server.
Is this tool free? ▾
Completely free — no login, no usage limits, works offline once loaded.
Yes — completely free, no login required, no usage limits.
Is my data private? ▾
Yes — all processing runs in your browser. Your data is never sent to any server.
Does it work offline? ▾
Yes — once the page is loaded, the tool works without an internet connection.