JSON to YAML

About this tool

Paste JSON and the YAML equivalent appears as you type. Objects become indented key: value pairs, arrays become dash lists, and strings, numbers, booleans and null keep their types. The conversion uses the js-yaml library and runs in your browser, so your data is not uploaded. If the input is not valid JSON, the output shows a warning with the parser's message so you can find the problem. Comments are not part of JSON, so none appear in the result. This is handy for turning API responses or config files into YAML for tools such as Kubernetes or CI pipelines.

How to use it

1. Paste valid JSON into the input box.
2. Read the YAML in the output box.
3. Fix any warning shown if the JSON is invalid.
4. Press Copy to use the YAML.

Example

{"name":"web","ports":[80,443],"debug":false}

name: web
ports:
  - 80
  - 443
debug: false

Common problems

A warning shows instead of YAML

The JSON is invalid. Common causes are trailing commas, single quotes and unquoted keys.

Strings that look like numbers or booleans

The converter quotes them when needed so they keep their type, which can look surprising.

Large files feel slow

Everything runs on your device, so very large inputs depend on your browser.