Kubernetes YAML Validator

Kubernetes YAML Validator

Paste a manifest (single doc or multi-doc with ---) and get structural + semantic checks against an embedded schema. Runs entirely in your browser.

Manifest
Findings (2 documents)
0 errors4 warn3 info
Doc #1: Deployment / web
  • warn
    spec.template.spec.containers[0].image
    Image "nginx:latest" uses :latest or no tag — pin to a versioned tag
  • warn
    spec.template.spec.containers[0].resources.limits
    No resource limits set (cpu/memory)
  • warn
    spec.template.spec.containers[0].resources.requests
    No resource requests set (cpu/memory)
  • info
    spec.template.spec.containers[0].livenessProbe
    No livenessProbe configured
  • info
    spec.template.spec.containers[0].readinessProbe
    No readinessProbe configured
  • warn
    spec.template.spec.containers[0].securityContext.runAsNonRoot
    runAsNonRoot is not true (checked container + pod-level) — container may run as root
  • info
    spec.template.spec.containers[0].securityContext.allowPrivilegeEscalation
    allowPrivilegeEscalation is not explicitly false (checked container + pod-level)
Doc #2: Service / webvalid
Supported kinds: Deployment, StatefulSet, DaemonSet, Service, Ingress, ConfigMap, Secret, Job, CronJob, Pod, PersistentVolumeClaim, ServiceAccount, HorizontalPodAutoscaler, NetworkPolicy

What This Tool Does

Kubernetes YAML Validator is built for deterministic developer and agent workflows.

Paste Kubernetes manifests for instant structural and semantic validation: required fields, apiVersion match, image pull secrets, resource limits, security context. Browser-only, no cluster contact.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/kubernetes-yaml-validator/

For automation planning, fetch the canonical contract at /api/tool/kubernetes-yaml-validator.json.

How to Use Kubernetes YAML Validator

  1. 1

    Paste your manifest

    Drop a single Kubernetes resource or a multi-document YAML file separated by --- into the input pane. The validator parses each document independently and reports per-document findings.

  2. 2

    Review structural errors

    Errors flag missing required fields, incorrect apiVersion for the kind, and YAML syntax problems. Each finding includes the dotted path so you can jump to the exact field in your editor.

  3. 3

    Address security warnings

    Warnings cover runAsNonRoot, missing resource limits, :latest image tags, wildcard CIDRs in Services, and missing TLS on Ingress. These are the issues that bite in production but kubectl apply still accepts.

  4. 4

    Iterate until clean

    Edit your YAML in the left pane and watch findings update live. Aim for zero errors and review each warning. Info-level findings are recommendations you can apply when ready.

  5. 5

    Apply with confidence

    Once findings are resolved, copy the manifest back to your repo or kubectl apply pipeline. The tool catches the issues a cluster admission controller will, before you waste a kubectl roundtrip.

Frequently Asked Questions

What is Kubernetes YAML Validator?
It parses Kubernetes manifests against an embedded schema and reports missing required fields, mismatched apiVersion, and security issues like missing resource limits or runAsNonRoot. Runs entirely in your browser.
Which kinds are supported?
Deployment, StatefulSet, DaemonSet, Service, Ingress, ConfigMap, Secret, Job, CronJob, Pod, PersistentVolumeClaim, ServiceAccount, HorizontalPodAutoscaler, and NetworkPolicy. Other kinds parse but are flagged as not in the catalog.
Does it replace kubectl apply --dry-run?
No. The validator catches structural and common security issues without a cluster, but kubectl --dry-run also validates against the live cluster's admission webhooks. Use both for full coverage.
Does it send my data to a server?
No. Parsing and validation run entirely in your browser. The manifest never leaves your device, which matters when YAML contains secrets or internal hostnames.
Can it validate Helm chart templates?
Render the chart locally first with helm template, then paste the rendered output. The validator does not execute Go templates, so unrendered {{ .Values.x }} placeholders will produce parse errors.