Convert a YAML file to formatted JSON locally - structure-preserving, no upload, right in your browser.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
JSON (JavaScript Object Notation) is the data format of the web: compact, unambiguous and understood by virtually every programming language and API. If you want to process a YAML configuration in a program, script or API, you usually need JSON - this tool does the conversion for you.
This tool reads your YAML entirely locally in your browser (js-yaml, pure JavaScript) and outputs cleanly indented JSON (2 spaces). Invalid YAML is rejected with a clear error. The conversion is structure-preserving - objects, lists and values stay identical. Nothing is uploaded.
The most common occasion: a hand-maintained settings file from a project needs to be read by a script, a browser tool or a web service that only accepts the compact web format. Since indentation is meaning-bearing in the source format, the tool surfaces typical pitfalls such as accidental tabs or misaligned lines right away - so you spot typos before they cause damage further down.
| Input formats | YAML, YML |
|---|---|
| Output format | JSON |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: The YAML must be valid (otherwise a clear error). YAML comments are lost (JSON has none). Multiple YAML documents in one file (---) are read up to the first one. Very large files need memory.
No. The conversion runs entirely locally in the browser - nothing is sent.
No. JSON does not support comments, so they are dropped in the conversion.
You get a clear error message with the cause - no crash.
Readable with 2-space indentation - ready for code and APIs.