JSON ↔ YAML

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Convert JSON to YAML and back, with validation.

Conversion runs live in your browser — nothing is uploaded. Edit either side and the other follows instantly.  · Drop a .json / .yaml file on either pane

Indent
data.json
data.yaml

About JSON ↔ YAML

The JSON ↔ YAML converter translates between the two formats in both directions, with validation built in. Paste JSON on one side or YAML on the other, and the conversion happens live in your browser; syntax errors are reported with the exact location, so a stray comma or bad indentation is found in seconds.

Formatting is configurable: choose the indentation width and optionally sort object keys alphabetically for stable, diff-friendly output. Live stats show lines, bytes, keys and nesting depth of your document, and the tool tells you whether the root is an object, an array or a scalar.

You can type, paste, upload a file or drag one onto the page, then copy or download the converted result. Because everything runs client-side, configuration files with secrets never leave your machine — a practical everyday bridge between API payloads and Kubernetes, CI or Docker Compose configs.

How to use JSON ↔ YAML

  1. Paste your JSON or YAML into its pane — or upload or drag a file onto the page.
  2. Fix any syntax error using the reported line position, if one is flagged.
  3. Set the indentation width and toggle key sorting to taste.
  4. Read the converted output in the opposite pane, along with the document stats.
  5. Copy the result or download it as a file.

Frequently asked questions

For data, yes — YAML is a superset of JSON, so every JSON document has a YAML representation and back. What changes is syntax: YAML uses indentation and allows comments, though comments are lost when converting to JSON, which has no comment syntax.

Invalid input is flagged with the position of the failure, so you can jump straight to the offending line — typically a missing comma or quote in JSON, or inconsistent indentation and unescaped special characters in YAML.

It orders object keys alphabetically at every level of the output. Sorted keys make converted files deterministic, which keeps version-control diffs small and makes two configurations easy to compare side by side.

YAML auto-types unquoted scalars: yes and no become booleans, 012 may parse as a number, and country codes like NO are infamous traps. Quote the value in your YAML source to force it to stay a string.

Yes — the conversion runs entirely in your browser, including files you drag in. Nothing is transmitted, so converting configs that contain credentials or internal hostnames is safe.

Yes, it is free with no size-based paywall — convert in both directions as often as you need.
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