YAML → JSON

Converts YAML into formatted JSON.

YAML to JSON converts your YAML document into clean, pretty-printed JSON right in your browser. Paste a YAML config, manifest, or data file and instantly get the equivalent JSON with two-space indentation. It is handy whenever a tool, API, or library expects JSON but your source is written in the more human-friendly YAML syntax.

Common uses

• Convert a Kubernetes, Docker Compose, or CI pipeline YAML manifest into JSON for tooling that only accepts JSON.
• Turn a YAML config file into JSON to paste into a REST client or API request body.
• Quickly inspect how YAML scalars (numbers, booleans, null, hex like 0x1A) map to JSON values.
• Flatten flow-style inline YAML such as {a: 1, b: [2, 3]} into standard pretty JSON.
• Validate that a YAML snippet is well-formed: invalid indentation, tabs, or duplicate keys surface as errors.

FAQ

Is my YAML data uploaded to a server?

No. The conversion runs entirely in your browser using a client-side YAML parser. Nothing you paste is ever sent over the network or stored on a server.

How is the JSON output formatted?

The output is pretty-printed with two-space indentation, making it easy to read and diff.

Does it support multiple YAML documents in one input?

No. It parses a single YAML document, so a stream separated by '---' will produce an error. Convert one document at a time.

What happens with empty or comment-only input?

A comment-only or blank document parses to JSON null, while a fully empty input produces no JSON output at all.

Why did my YAML fail to convert?

The parser rejects malformed YAML such as tab-based indentation, inconsistent list nesting, or duplicate mapping keys. Fix the reported syntax issue and try again.

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