JSON ↔ YAML Converter
Convert JSON to YAML and YAML to JSON with instant, bidirectional conversion. Validates syntax, preserves nested structures, and handles arrays, nulls, and booleans correctly. 100% client-side — your data never leaves the browser.
How It Works
Paste your JSON or YAML
Choose the conversion direction and paste your input. The tool validates and converts as you type.
Review the output
See the converted result with proper formatting and indentation. Syntax errors are highlighted instantly.
Copy the result
Copy the converted output to your clipboard with one click. Use the swap button to convert in the opposite direction.
Frequently Asked Questions
What is YAML?
YAML (YAML Ain't Markup Language) is a human-friendly data serialization format. It is widely used for configuration files including Docker Compose, Kubernetes manifests, GitHub Actions workflows, and Ansible playbooks. It uses indentation instead of braces and brackets.
Does conversion preserve nested structures?
Yes. Both JSON objects and YAML nested mappings are fully supported. The tool correctly converts deeply nested objects, arrays, and mixed structures in both directions.
Is my data sent to a server?
No. All conversion happens entirely in your browser using JavaScript. Your data never leaves your device.
What happens with YAML comments?
YAML comments (lines starting with #) are stripped during conversion to JSON, since JSON does not support comments. When converting JSON to YAML, you can add comments to the output manually.
What indentation does the YAML output use?
The YAML output uses 2-space indentation, which is the most common convention for YAML configuration files. JSON output uses 2-space indentation as well.