Validate YAML syntax, format with block or flow style, and convert between YAML and JSON. Key counts, structure preview, and shareable settings — free and private.
Step-by-step guide to get the most from this tool
Select Validate, Format YAML, or Convert between YAML and JSON.
Enter your YAML or JSON in the input panel.
Set indent (2 or 4) and block/flow style where applicable.
Copy the formatted or converted result, or share your settings via link.
What makes this tool stand out
Syntax errors with line and column numbers.
Normalize indentation with block or flow style.
Bidirectional YAML ↔ JSON conversion.
100% client-side — configs never uploaded.
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Quick answers to common questions
Select Validate mode and paste your YAML. Valid files show a success message with key count. Syntax errors display the parser line and column.
Block style uses indented nested structures (default for configs). Flow style uses inline JSON-like notation for compact output.
Select Convert mode with YAML → JSON, paste your YAML, and copy the formatted JSON output.
Yes. Switch to JSON → YAML in Convert mode, paste JSON, and get formatted YAML with your chosen indent and style.
No. All parsing and conversion happens entirely in your browser. Your configs never leave your device.
Standard YAML 1.2 including arrays, nested objects, booleans, and numbers. Kubernetes and Docker Compose configs are supported.
Most projects use 2 spaces. You can also choose 4 spaces for both YAML formatting and JSON output.
YAML is human-readable for config files (Kubernetes, CI/CD). JSON is better for APIs and data interchange.
Your data is processed entirely in your browser. Nothing is sent to any server.