YAML Validator & Schema Validator
Free online tool to validate YAML syntax and validate YAML against JSON schemas. Perfect for Kubernetes manifests, CI/CD pipelines, and configuration files.
How to Use This Tool
Paste your YAML content in the input field and the validator will check it in real-time. The tool supports two modes:
- Validate YAML: Checks YAML syntax and shows the parsed structure as JSON
- Validate with Schema: Validates your YAML data against a JSON Schema definition
All validation happens in your browser – your YAML data never leaves your device. Perfect for Kubernetes manifests, CI/CD configuration files, and any YAML documents.
Common Use Cases
YAML validators are essential for DevOps teams working with Kubernetes manifests, Docker Compose files, CI/CD pipeline configurations (GitHub Actions, GitLab CI, CircleCI), Ansible playbooks, and configuration files.
Use this tool to catch YAML indentation errors before deployment, validate Kubernetes resource definitions, verify CI/CD pipeline syntax, debug configuration file issues, and ensure YAML documents meet schema requirements.
Schema validation is particularly useful for enforcing configuration standards across teams, validating API contracts, and ensuring data quality. For more developer tools, explore Pour plus d'outils pour développeurs, visitez TextToolbox.
Frequently Asked Questions
What does the YAML Validator check?
The validator checks YAML syntax including proper indentation, valid key-value pairs, correct use of lists and nested structures, proper quoting, and anchor/alias references. It also converts YAML to JSON to show the parsed structure, making it easy to verify your YAML is being interpreted correctly.
How does schema validation work?
Schema validation converts your YAML to JSON and validates it against a JSON Schema. This allows you to enforce structure, required fields, data types, and constraints. It's perfect for validating Kubernetes CRDs, API configurations, and standardized config files across your organization.
Can I validate Kubernetes manifests with this tool?
Yes! This tool is excellent for validating Kubernetes YAML manifests. It will catch syntax errors, indentation issues, and structural problems. For full Kubernetes validation including API version checks and resource-specific validation, you may want to also use kubectl --dry-run.
Is my YAML data safe when using this tool?
Yes, absolutely. All YAML validation happens entirely in your browser using JavaScript. Your data never leaves your device or gets sent to any server. This means you can safely validate sensitive configuration files, secrets (though you should rotate them anyway!), or confidential documents without privacy concerns.
Why does my YAML look different when converted to JSON?
YAML and JSON have slightly different features. For example, YAML supports comments (which are stripped in JSON), multi-line strings (which become single-line in JSON), and anchors/aliases (which are resolved to their actual values in JSON). The JSON output shows how the YAML will be interpreted by parsers.
Do I need to sign up or pay to use this tool?
No, this tool is completely free to use with no signup required. There are no usage limits, no file size restrictions, and no hidden costs. We believe developer tools should be accessible to everyone without barriers.