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YAML to JSON

Convert YAML to JSON format

About YAML to JSON

YAML to JSON parses simple, flat 'key: value' lines into a JSON object, entirely in your browser — nothing is uploaded to a server. It doesn't support nested structures, lists (- item), multi-line strings, comments, or booleans/null — only flat top-level key-value pairs. A key with no value after the colon converts to 0 rather than null, since it isn't recognized as a distinct case.

How to use YAML to JSON

  1. 1Paste simple, flat YAML — one 'key: value' pair per line — into the input box.
  2. 2Click 'Convert' to parse it into JSON.
  3. 3Review the output, especially for nested keys, lists, or missing values.
  4. 4Click 'Copy' to copy the JSON result.

Frequently Asked Questions

Is YAML to JSON free to use?

Yes, completely free with no registration required.

Does it support nested YAML structures?

No — only flat, top-level 'key: value' pairs are recognized; indented nested keys aren't parsed into nested JSON objects.

Does it support YAML lists (- item)?

No — list syntax isn't recognized and won't convert into a JSON array.

Is my data uploaded to a server?

No, conversion happens entirely in your browser.

Tips & Tricks

  • ✓Works best on simple, flat configuration snippets with one key-value pair per line.
  • ✓For nested YAML, lists, comments, or multi-line strings, use a dedicated YAML parser library instead.
  • ✓Numbers are auto-detected and converted to JSON numbers; other values are kept as strings.
  • ✓A key left with no value (like 'foo:') converts to 0, not null — adjust the output manually if you need a true null.