Are my files uploaded to a server?

No. This tool runs entirely in your browser — your files never leave your device, which makes it fast and completely private.

Does it support nested and multi-document YAML?

Yes — nested maps, lists and scalars are converted to the equivalent JSON structure. Invalid YAML is flagged with an error so you can fix it.

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YAML to JSON

Convert YAML into JSON instantly.

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How to use the YAML to JSON

1Paste or type your YAML on the left.
2The JSON output updates automatically as you type.
3Copy the formatted JSON or fix any errors it flags.

About the YAML to JSON

Free YAML to JSON converter — paste YAML and get clean, valid JSON instantly, right in your browser. Handles nested keys, lists and comments. Private, no upload, copy in one click.

Part of our Developer Tools collection. Browse all tools.

Frequently asked questions

Are my files uploaded to a server?: No. This tool runs entirely in your browser — your files never leave your device, which makes it fast and completely private.
Does it support nested and multi-document YAML?: Yes — nested maps, lists and scalars are converted to the equivalent JSON structure. Invalid YAML is flagged with an error so you can fix it.