JSON / YAML Converter

This converter translates data between JSON and YAML, two text formats for representing structured data such as objects, arrays, numbers, strings, and booleans. Paste a document in either format and it produces the equivalent in the other, preserving the underlying structure while changing only the syntax. It is handy when one tool expects JSON and another expects YAML, or when you simply want a more readable view of a dense config.

How to use it

1. Paste or type your source into the input box. The tool accepts either JSON or YAML.
2. Choose or confirm the conversion direction (JSON to YAML, or YAML to JSON).
3. Run the conversion. The equivalent document appears in the output panel.
4. Check for any parse errors flagged on malformed input, then copy the result.

Because both formats describe the same data model, a round trip should return structurally identical content, though formatting details like key order or quoting may differ.

JSON vs YAML

JSON uses braces, brackets, and commas, and requires double-quoted keys. It is compact, strict, and the default for web APIs and JavaScript tooling. YAML uses indentation instead of brackets, allows unquoted strings, and supports comments with #, which makes it popular for configuration files like those in Docker, Kubernetes, and CI pipelines.

Feature	JSON	YAML
Comments	Not supported	Supported with #
Structure	Brackets and braces	Indentation
Typical use	APIs, data exchange	Config files
Readability	Dense	More human-friendly

Note that JSON is a valid subset of YAML, so most JSON parses cleanly as YAML, but the reverse is not always true.

FAQ

Why did my comments disappear?

JSON has no comment syntax, so any # comments in your YAML are dropped when converting to JSON. They cannot be recovered by converting back, so keep an original copy if comments matter.

How is indentation handled?

YAML relies on consistent indentation to define nesting, and mixing tabs with spaces is a common cause of parse failures. Use spaces throughout. JSON ignores whitespace, so going from JSON to YAML generates clean indentation automatically.

Will my data types stay the same?

Mostly, but watch the gotchas. YAML may interpret an unquoted yes, no, or on as a boolean, and a leading-zero or large number can shift type. Quote ambiguous strings to keep them as text.

Is anything sent to a server?

Conversion runs in your browser, so the data you paste is processed locally rather than uploaded, which suits sensitive configuration content.