YAML to JSON

How to use YAML to JSON

1. Open YAML to JSON — it runs entirely in your browser with no setup.
2. Paste or type your input into the text area, or upload a file where supported.
3. Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server.
4. Review the output instantly; large inputs are handled locally without lag.
5. Copy the result to your clipboard or download it. Your data never leaves the page.

Why use YAML to JSON?

• 100% free with no limits, no sign-up and no watermarks.
• Private by design — your data are processed in your browser and never uploaded to a server.
• Fast and lightweight, with instant results even on a phone or a slow connection.
• Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
• Part of a full developer tools suite, so related yaml to json tasks are one click away.

What people use YAML to JSON for

• Feeding a config file into a tool or API that only accepts JSON.
• Checking exactly how a parser will interpret an ambiguous YAML file.
• Converting a Kubernetes or CI manifest for programmatic processing.

YAML to JSON: limits and things worth knowing

• This is the fastest way to catch the Norway problem: an unquoted NO becomes the boolean false, and you can see it in the JSON output immediately. The same applies to yes, on, off and to versions like 1.10.
• Comments and anchors do not survive. JSON has no equivalent of either, so anchors are expanded inline and comments are dropped.
• A YAML file can contain several documents separated by ---. JSON has no equivalent, so multi-document sources need converting one document at a time.
• Duplicate keys are legal in some YAML parsers and not in others; converting surfaces them because the JSON object can only keep one.

Is it private and secure?

Your privacy is built in. YAML to JSON runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

Learn more

Working with JSON, XML and YAML: Format, Validate and Convert — Messy config or API response? Learn to pretty-print, validate and convert between JSON, XML, YAML and CSV in seconds.