YAML Validator
Validate your YAML syntax instantly. Perfect for Kubernetes manifests, Docker Compose files, and configuration files. 100% free and secure.
How to Validate YAML
- Paste your YAML data in the input area
- Click the "Validate" button
- View validation results with error locations if any
- Fix indentation or syntax errors and re-validate
Common YAML Errors
Indentation Errors
YAML requires consistent indentation. Mixing tabs and spaces or inconsistent spacing causes errors.
Missing Colons
Keys must be followed by a colon and space: "key: value" not "key value"
Unquoted Special Characters
Strings with special characters like : @ # should be quoted to avoid parsing issues.
Duplicate Keys
Each key in a mapping must be unique. Duplicate keys cause unexpected behavior.
Common Use Cases
- -Kubernetes manifests and configs
- -Docker Compose files
- -CI/CD pipelines (GitHub Actions, GitLab CI)
- -Ansible playbooks
- -Application configuration files
- -OpenAPI/Swagger specifications
Frequently Asked Questions
What does the YAML Validator check?
The validator checks YAML syntax including proper indentation, correct key-value formatting, valid data types, and proper structure. It pinpoints the exact line and column of any errors.
Why is indentation important in YAML?
YAML uses indentation to define structure and hierarchy (unlike JSON which uses braces). Inconsistent indentation or mixing tabs and spaces causes parsing errors.
Can I validate Kubernetes manifests?
This validator checks YAML syntax. For Kubernetes-specific validation (API versions, required fields), you'd need a Kubernetes-aware validator. However, syntax errors are caught here.
Is my YAML data secure?
Yes, all validation happens directly in your browser. Your YAML is never sent to any server or stored anywhere.