YAML Validator
Instantly detect YAML syntax errors with JSON preview and statistics
About YAML Validator
YAML Validator checks the syntax of your YAML text and clearly displays any errors with line numbers. Valid YAML is converted and displayed in JSON format, along with basic statistics such as key count and nesting depth.
Use it as a pre-deployment check when creating configuration files for Docker Compose, GitHub Actions, Kubernetes, Ansible, and more. The validator displays multiple errors in a list format for efficient debugging. Includes linting features such as indentation warnings and duplicate key detection.
All processing happens in your browser — no data is sent to any server. Validate YAML files safely in your local environment.
How to use YAML Validator
- Paste or type your YAML text into the input area
- Syntax is checked in real-time, showing Valid, Invalid, or Warning status
- All errors are displayed with line number, column number, and error message
- For valid YAML, the JSON conversion result is shown with a copy button for easy export
- View statistics including key count, nesting depth, object count, array count, and string count
Benefits of YAML Validator
- Real-time validation catches errors instantly and improves development efficiency
- Display all errors with line and column numbers, making it easy to locate and fix issues
- JSON preview lets you visually verify data structure and copy output for reuse
- Linting warnings (indentation, duplicate keys) enforce quality standards and prevent production issues
- Extended statistics (type counts, object/array counts) help you deeply understand YAML structure
- Browser-only processing keeps your data private and secure without any server uploads
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