YAML Formatter
Format and validate YAML with consistent indentation and optional key sorting.
YAML Validator
Validate YAML syntax and pinpoint errors with clear line references.
Input data is processed in your browser
Data is never sent to a server
Tool
What is YAML Validator?
YAML Validator checks whether your YAML text is syntactically correct. When there is an error, it shows the error message and highlights the approximate line. When the YAML is valid, it displays structural information such as the number of keys, maximum nesting depth, list count, and document count. Useful for debugging Docker Compose, GitHub Actions, and Kubernetes manifest files.
How to Use
- Paste your YAML into the input field.
- Click "Validate" or enable auto-validate to check in real time.
- If the YAML is invalid, the error message and approximate line are shown.
- If the YAML is valid, structural stats such as key count and max depth are displayed.
FAQ
How is this different from YAML Formatter?
YAML Formatter focuses on pretty-printing. YAML Validator focuses on syntax checking, error location, and structural statistics.
Does it support multi-document YAML (separated by ---)?
Yes. YAML files containing multiple documents separated by "---" are supported, and the document count is shown.
How is the error location shown?
The tool extracts the line where the parse error occurred along with the surrounding lines.
Is my data sent to a server?
No. All processing happens in your browser.