YAML ↔ JSON

Convert YAML to JSON and back. Preserves keys, lists, nesting, and primitive types.

100% Private
Your files never leave your device
Lightning fast
Optimised for speed
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Use instantly, no account
Indent
YAML
Converted in your browser — nothing is uploaded.
JSON

Convert YAML to JSON and JSON to YAML in your browser, with live validation and the exact line of any syntax error. Choose your indentation and copy or download the result.

How to use YAML ↔ JSON

  1. 1Pick a direction: YAML → JSON or JSON → YAML.
  2. 2Paste your data; it’s validated as you type.
  3. 3Choose 2- or 4-space indentation.
  4. 4Copy or download the converted output.

Frequently asked questions

The tool shows a clear message with the line and column of the problem, so you can fix it quickly instead of guessing.
Yes — hit Swap and the converted output becomes the new input with the direction reversed.
No. Everything runs entirely inside your browser using your own device — your files never leave your computer or get uploaded anywhere. That makes it private and fast, even for large files.
Yes, completely free with no sign-up, no watermark, and no daily limits. Use it as much as you like.

Still have questions?

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