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YAML to JSON

Paste YAML and get pretty-printed JSON instantly, with clear error messages when something is off. Everything runs in your browser.

Your YAML

Paste or type. Conversion happens live.

Multi-document files separated by --- become a JSON array.
JSON output

Waiting for YAML input.

{"result":"Your converted JSON will appear here."}
Private by design: parsing uses the js-yaml library (loaded once from a CDN) and formatting happens locally. Your data is never uploaded.
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How it works

The js-yaml parser reads your YAML into a JavaScript object, then the page prints it as indented JSON. Multi-document YAML (separated by ---) becomes a JSON array of documents. Dates and special types are converted to their JSON-friendly forms.

Fixing parse errors

  • Tabs vs spaces: YAML indentation must use spaces, never tabs.
  • Indentation: keep nested levels consistent, usually two spaces per level.
  • Colons: a colon inside a value needs a space after it (key: value).
  • Quotes: wrap values with special characters like # or : in quotes.

Related tools

JSON formatterPretty-print and validate JSON with error highlighting. Base64 encoderEncode files and text to Base64, or decode them back. Regex testerTest regular expressions against sample text live.

YAML to JSON FAQs

What is the difference between YAML and JSON?
YAML is a human-friendly configuration format that uses indentation instead of brackets. JSON is stricter and machine-oriented, using braces, brackets and quoted keys. Both describe the same data, which is why conversion is lossless for most documents.
Why convert YAML to JSON?
Many APIs, JavaScript apps and config tools only accept JSON. Converting lets you write comfortably in YAML and paste strict JSON where it is required.
Is my YAML uploaded anywhere?
No. Parsing and formatting happen in your browser with the js-yaml library. Your data never leaves your device.
Does it support nested YAML and multiple documents?
Nested objects, arrays and all standard YAML types are supported. Multi-document files separated by --- convert to a JSON array of documents.
What do I do when I get a parse error?
The error box shows the exact message from the parser, usually with a line and column. The most common cause is mixed tabs and spaces: YAML requires spaces for indentation.
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