YAML ↔ JSON Converter
Convert between YAML and JSON instantly, right in your browser. Paste either format and get a live, validated conversion with copy and download.
🔒 Processed locally in your browser
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How to use
- Choose a direction: YAML → JSON or JSON → YAML using the toggle at the top.
- Paste or type your YAML or JSON into the input box.
- The converted result appears instantly below — there's no button to press.
- Use Copy to copy the result, or Download to save it as a .json or .yaml file.
Features
- Converts YAML to JSON and JSON to YAML in both directions
- Updates live as you type — no button to press
- Clear error messages when the input isn't valid YAML or JSON
- Swap button lets you feed the output back in as new input
- 100% client-side — your data never leaves your browser
Frequently asked questions
Does my data get uploaded anywhere?
No. This converter runs entirely in your browser using the js-yaml library — your YAML and JSON are never sent to a server.
What happens if my input is invalid?
You'll see a clear error message describing what's wrong with the YAML or JSON, instead of a broken or empty result.
Does the converter preserve key order and data types?
Yes. Object key order, numbers, booleans, null values, and nested arrays and objects are all preserved during conversion.
Can I convert the result back to the original format?
Yes, use the Swap button to switch direction and load the current output as the new input, letting you round-trip between formats.
Does it support large YAML or JSON files?
Yes, though very large files (tens of megabytes) may be slower to process depending on your device, since everything happens in your browser.