Which YAML features are supported?

The common subset — nested mappings, block and inline sequences, and scalars (strings, numbers, booleans, null). Anchors, multi-line block scalars and multiple documents in one file are not parsed.

How are values typed?

Plain numbers become JSON numbers, true/false become booleans, null and ~ become null, and quoted values stay as strings, so the JSON reflects the intended types.

Is my YAML uploaded anywhere?

No. Parsing happens entirely in your browser with JavaScript — your configuration never leaves your device.

YAML to JSON Converter

Convert YAML config into formatted JSON.

Convert YAML to JSON in your browser

Paste YAML and get clean, pretty-printed JSON. The parser handles the common YAML subset used in most config files: nested maps, block and inline sequences, and scalars typed as numbers, booleans, null or strings. Anchors, multi-line block scalars and multi-document files are out of scope.

Everything runs locally in your browser — your configuration and secrets are never uploaded or stored, so it is safe for sensitive files.