Why convert between YAML and JSON?

They describe the same data, but tools differ: Kubernetes, Docker Compose, and CI pipelines are written in YAML, while APIs and many config loaders use JSON. Converting lets you paste a JSON snippet into a YAML manifest, or read a dense YAML file as structured JSON to spot the shape. YAML is friendlier to write; JSON is stricter and unambiguous.

Which YAML features are supported?

The common config subset: block mappings (key: value), block sequences (- item), arbitrary nesting by indentation, comments, quoted and plain strings, numbers, booleans (true/false/yes/no), null, and inline flow like [a, b] and {k: v}. Advanced features - anchors and aliases, multi-document streams, complex multiline block scalars - are not parsed; almost all real config files do not use them.

Is my config uploaded?

No. Parsing and conversion run entirely in your browser - nothing you paste is sent anywhere. That matters because config files routinely contain hostnames, image references, and occasionally secrets.

Free tool · Runs in your browser · Nothing uploaded

YAML ↔ JSON.

Convert YAML config to JSON or JSON to YAML — mappings, lists, nesting, comments, and quoted strings. The everyday move when you are wrangling Kubernetes, Compose, or CI files. Two-way, in your browser.

YAML

JSON

Handles the common config subset (mappings, sequences, nesting, comments, quotes, flow). Anchors, aliases, and multi-document streams are not parsed.

The same config, in whichever dialect the tool wants

YAML won the config wars because it is pleasant to write, but its whitespace-significant syntax is also where a misplaced indent silently changes meaning. Round-tripping through JSON is a quick way to see the actual structure your YAML describes — and to pull a JSON snippet into a manifest without hand-translating it. Keep the human-friendly YAML for editing, lean on JSON when you need certainty about the shape.

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