HTMLYAML ↔ JSON Converter
Convert YAML to JSON or JSON to YAML instantly. Handles nested objects, arrays, strings, numbers, booleans, and null values. 100% in-browser.
Ctrl+Enter to run | Ctrl+K to switch tools | Recent button shows input history
Repeating this work? Turn this kind of browser utility into an API batch, MCP prompt, extension workflow, or shared team recipe.
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When should I use YAML vs JSON?
YAML is human-readable and great for config files (Docker Compose, GitHub Actions, Kubernetes). JSON is better for APIs and machine-to-machine data exchange since it's more explicit and has no indentation ambiguity.
Are all YAML features supported?
This tool handles common YAML: key-value pairs, nested objects, arrays, quoted strings, numbers, booleans, and null. Advanced YAML (anchors, aliases, multi-document, complex keys) is not supported.