Convert YAML to JSON and JSON back to YAML, both ways. Validates as it converts and shows clear errors. Everything runs in your browser.
How to use the YAML ⇄ JSON
Choose the direction: YAML to JSON or JSON to YAML.
Paste your YAML or JSON into the input panel.
Copy the converted result, or read the error if the input is invalid.
Frequently asked questions
It uses the YAML 1.2 / 1.1 compatible parser from js-yaml, covering the common features: mappings, sequences, scalars, anchors and multi-line strings.
The input is parsed before converting, so invalid YAML or JSON shows a message with the reason and often the line, which helps you spot the problem quickly.
No. YAML comments are dropped during conversion because JSON has no comments, and converting back generates fresh YAML without them.
No. The conversion runs entirely in your browser; nothing you paste leaves your device.
This converter transforms YAML into JSON and JSON into YAML in both directions. Each conversion parses the source first, so malformed input is caught and reported instead of producing a broken result.
It is useful for working with configuration files, CI pipelines and APIs that mix the two formats. Everything is processed locally in your browser.
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