JSON ↔ YAML Converter — Free Online Tool
Convert JSON to YAML or YAML to JSON with automatic direction detection based on the input format. Uses js-yaml v4 with safe-load by default — no JavaScript constructors or arbitrary code can execute during YAML parsing. Useful for working with Kubernetes configs, CI/CD pipelines, and API schemas.
100% client-side. No uploads. Your data never leaves your browser.
How to use JSON ↔ YAML Converter
- Paste JSON or YAML into the input area.
- The tool auto-detects the format and converts to the other.
- Review the output for any type-casting differences.
- Copy or download the converted result.
Frequently Asked Questions
Is it safe to paste untrusted YAML?
Yes. js-yaml v4 uses safe-load by default, which disables the !! type constructors that could execute arbitrary JavaScript.
Does YAML support all JSON data types?
Yes. YAML is a superset of JSON and supports strings, numbers, booleans, null, arrays, and objects. Additionally, YAML supports comments (which JSON does not).
Why does my YAML convert incorrectly?
Common issues: unquoted strings that look like numbers or booleans (e.g. 'yes', 'no', '1.0') are auto-cast by YAML. Quote them explicitly if you need string type.
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