JSON to YAML Converter Online

How to convert JSON to YAML

Paste your JSON into the editor.
Open the Code tab and choose YAML.
Copy the YAML into your config file.

JSON and YAML compared

In practice every JSON document can be written as YAML, which uses indentation instead of braces and brackets and allows comments. It is popular for configuration because it is easy to read and edit by hand, while JSON remains the safer choice for machine-to-machine exchange.

Strings that need quotes

Values such as yes, no, on, null, 1.0 or text containing a colon followed by a space would be read as booleans, numbers or nested maps in YAML. The converter wraps these in double quotes so the original type is preserved when the YAML is parsed back.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based data format that is easy for people to read and for machines to parse. It is the de facto standard for web APIs, configuration files and data exchange between services. A JSON document is built from just six value types: objects, arrays, strings, numbers, booleans and null.

{
  "name": "Ada",
  "age": 36,
  "admin": true,
  "skills": ["math", "code"],
  "address": { "city": "London" },
  "manager": null
}

JSON is stricter than JavaScript object literals: keys and strings must use double quotes, trailing commas are not allowed and comments are not part of the specification (RFC 8259).

Why format JSON?

APIs usually return minified JSON on a single line, which is efficient for machines but unreadable for people. Formatting (also called pretty printing or beautifying) adds consistent indentation and line breaks so that you can scan the structure, spot mistakes and review changes. Minifying does the opposite and strips whitespace to reduce size.

Frequently asked questions

Will comments be preserved?

JSON has no comments, so there is nothing to carry over. You can add comments to the YAML after converting.

Is my JSON uploaded to a server?

No. Parsing, validation, formatting, diffing and code generation all run inside your browser, using a Web Worker. Your data is never sent to any server, which makes the tool safe for API responses, configuration files and other sensitive payloads.

How large a JSON file can I open?

Files of 20 MB and more work. Parsing happens off the main thread and the tree view is virtualized, so only the rows you can see are rendered. The editor switches to a lighter mode for very large documents.

What is the difference between formatting and minifying JSON?

Formatting (pretty printing) adds line breaks and indentation so people can read the data. Minifying removes all optional whitespace to make the payload as small as possible for network transfer or storage. Both produce identical data.

JSON to YAML