Convert JSON to YAML
You convert JSON to YAML here by dropping the file into the box above and clicking Convert to YAML. The js-yaml library runs as JavaScript in your browser to do the rewrite, so the conversion happens on your device and the file is never sent anywhere.
Runs in your browser. Your file never leaves your device.Drop your JSON hereChoose a JSON to convert
It becomes a YAML right in your browser, up to 100 MB
Your file never leaves your device
Works in airplane mode. See the proof
Limits, published exactly
| Where it runs | In your browser. The file never leaves your device. |
|---|---|
| Free conversions | Unlimited. No account, no ads, no queue, no watermark. |
| Max file size, free | 100 MB |
Why convert JSON to YAML?
People reach for this when JSON has to become something a human will actually read and edit. JSON is fine for machines but noisy for hand-editing: braces, quotes and commas everywhere. YAML expresses the same data with indentation and far less punctuation, which is why config files for Kubernetes, Docker Compose and CI pipelines tend to live in YAML. Converting a JSON config or an API response into YAML gives you a tidier file to drop into one of those tools or to review in a pull request, without retyping the structure by hand.
What is JSON?
JSON is the lingua franca of APIs and config: nested objects and arrays in a compact, human-readable text form that almost every language can parse. It handles structured and hierarchical data that a flat table cannot. For tabular data it is often paired with CSV, and for configuration with YAML.
What is YAML?
YAML is a human-friendly data format built for configuration: indentation instead of braces, comments, and a clean look that made it the default for Kubernetes, Docker Compose, and CI pipelines. It maps one to one onto JSON, so the two convert losslessly. People reach for YAML when a human has to read and edit the file by hand.
Quality and what to expect
This conversion is structure-preserving and lossless in both directions. Every key, every value and the full nesting come across intact; only the syntax changes from JSON braces to YAML indentation. Strings, numbers, booleans, nulls, nested objects and arrays all map cleanly, because YAML is a superset of JSON and the two describe the same data model. Nothing is flattened or dropped, unlike a conversion to a flat format such as CSV. The output is standard YAML you can feed straight back through a parser; if you convert it back to JSON you get the same data you started with.
JSON to YAML FAQ
Does converting to YAML lose any of my data?
No. YAML can represent everything JSON can, so keys, values and nesting all survive the rewrite intact. Only the syntax changes; convert the YAML back to JSON and you get the same structure you began with.
Why is YAML easier to read than JSON?
YAML uses indentation instead of braces and drops most of the quotes and commas JSON requires. The same config that looks dense in JSON reads as a clean, top-down outline in YAML, which is why config tooling favours it.
Can the YAML be used in Kubernetes or CI configs?
Yes. The output is ordinary YAML written by js-yaml, so it drops straight into Kubernetes manifests, Docker Compose files, GitHub Actions workflows or any other tool that reads standard YAML.
Does my config get uploaded to convert it?
It does not. The js-yaml parser runs entirely in your browser tab, so even a config full of secrets or internal hostnames stays on your machine. There is no server round-trip in this conversion.