How to Use This YAML Validator
- Paste your YAML: Copy your Kubernetes manifests or any YAML file into the left box.
- Instant validation: Errors appear immediately on the right with exact line numbers and descriptions.
- Auto-format: Click "Format" to fix indentation and spacing automatically (2-space indent).
- Copy the result: Click "Copy" to grab the validated YAML for deployment.
Common Use Cases for YAML Validation
☸️ Kubernetes Manifests
Validate Deployments, Services, ConfigMaps,
and Ingress before running kubectl apply. Catch errors before they hit your
cluster.
🐳 Docker Compose
Check docker-compose.yml files for syntax errors. Missing indentation can break your entire stack.
⚙️ CI/CD Pipelines
Validate GitHub Actions, GitLab CI, CircleCI configs. One wrong space can fail your entire pipeline.
📦 Helm Values
Check values.yaml files before running helm install. Prevent deployment failures.
Why YAML Validation is Critical for Kubernetes
YAML is whitespace-sensitive. Unlike JSON, where indentation is cosmetic, YAML uses indentation to define structure. A single misplaced space can completely change the meaning of your config.
❌ Common YAML Errors
- • Tabs vs Spaces: YAML does NOT allow tabs. Use 2 spaces for indentation.
-
• Missing colon space:
key:valueis invalid. Must bekey: value - • Inconsistent indentation: Mixing 2-space and 4-space indents breaks parsing
-
• Unquoted special chars: Values with
:,{},[]need quotes
What This Tool Does
✅ Multi-Document Support
Validates YAML files with multiple documents
(separated by ---). Common in Kubernetes manifests.
🎨 Auto-Format
Automatically fixes indentation to 2 spaces. Removes tabs. Makes your YAML consistent and readable.
⚡ Instant Validation
Real-time parsing as you type. See errors immediately with exact line numbers and clear messages.
🔒 Privacy First
Runs 100% in your browser using js-yaml. Your Kubernetes secrets never leave your device.