YAML ("YAML Ain't Markup Language") is a human-friendly data format widely used for configuration files (Kubernetes manifests, CI pipelines, Docker Compose) — it's a strict superset of JSON's data model, with cleaner syntax, comments, and multi-line strings.
This tool converts between the two so you can inspect a YAML config as strict JSON for tooling that only understands JSON, or turn a JSON payload into a more readable YAML document.
Parsing uses js-yaml's safe mode, which only produces plain data (objects, arrays, strings, numbers, booleans) and never executes custom YAML tags — everything runs locally in your browser.
Why did my YAML fail to parse?
YAML is sensitive to indentation — mixing tabs and spaces, or inconsistent indent width between sibling keys, is the most common cause of a parse error.
Does YAML support the same data types as JSON?
YAML is a superset of JSON's data model plus extras like comments, anchors/aliases, and multi-line strings — anything expressible in JSON converts cleanly to YAML, but not every YAML feature has a JSON equivalent.
Is this safe against YAML "billion laughs" or code-execution exploits?
Yes — the converter uses js-yaml's safe load mode, which parses only standard YAML data types and never instantiates arbitrary JavaScript objects or executes tags.