YAML to JSON Converter

Paste your YAML into the input box, or load a .yaml or .yml file. The tool converts it to JSON instantly as you type. Mappings become objects, sequences become arrays, and scalars keep their type. Choose pretty-printed or minified output, then click Copy JSON or Download .json.

No. The conversion runs entirely in your browser with JavaScript. The YAML you paste or the file you load is parsed on your own device and is never sent to a server, logged, or stored. That means you can safely convert private config, secrets templates, or internal data, and the tool keeps working offline once the page has loaded. Closing or refreshing the tab clears everything.

Yes. YAML comments starting with # are ignored during parsing, and block scalars written with | or > are read as multi-line strings. Because JSON has no concept of comments, they do not appear in the output — only the actual data does. Anchors and aliases are resolved to their referenced values so the JSON is fully expanded.

Pretty-printed JSON is indented with two spaces so it is easy to read and review. Minified JSON strips all optional whitespace to produce the smallest valid string, which is better for sending over a network or embedding in code. Both represent exactly the same data — tick Minify to switch, and the output updates immediately.

The tool validates the YAML as you type and shows the parser's message, including the line and column where the problem was found — for example inconsistent indentation or a tab character, which YAML does not allow. Fix the reported issue and the JSON appears right away.