What is the difference between YAML and JSON?

YAML uses indentation and is more human-readable, commonly used in config files. JSON uses braces and brackets, preferred in APIs and web applications. Both represent the same data structures.

Is my data sent to a server?

No. All conversion runs entirely in your browser using JavaScript. Your content never leaves your device.

Can I validate YAML syntax with this tool?

Yes — invalid YAML will show a parse error with the line and column where the issue occurs.

YAML to JSON Converter — Free Online YAML JSON Tool

Convert YAML to JSON and JSON to YAML instantly in your browser. Paste your content and get the converted output with syntax validation. Free, nothing uploaded to any server.

YAML input

JSON output (pretty-printed)

How it works

—YAML → JSON: paste YAML on the left, click Convert — get pretty-printed JSON on the right.
—JSON → YAML: paste JSON on the left, click Convert — get clean YAML on the right.
—All processing runs in your browser. No data is sent to any server.

Notes & limitations

—YAML is a superset of JSON — all valid JSON is valid YAML, but not vice versa.
—YAML supports comments and unquoted keys; these are lost when converting to JSON.
—Round-tripping (YAML → JSON → YAML) may produce slightly different formatting.
—JSON output uses 2-space indentation for readability.

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