What are the most common YAML syntax errors?

Indenting with Tab (YAML only allows spaces), missing the space after a key (it must be key: value), and unquoted values starting with a colon or hash.

Are comments lost in conversion?

JSON does not support comments, so YAML-to-JSON drops them; the reverse direction cannot restore them either.

Is multi-document YAML (--- separated) supported?

Input is parsed as a single document; for multi-document files, split them and convert one by one.

JSON to YAML Converter

Free online JSON and YAML converter with direction auto-detection, clear error line hints and 2-space indent — local.

Privacy: all processing happens locally in your browser. Your input never leaves your device.

What is JSON to YAML Converter?

Cloud-native configs such as Kubernetes, Docker Compose and GitHub Actions use YAML, while APIs and programs mostly speak JSON — converting between the two is a daily need. This tool converts both ways: YAML parse failures come with readable line-and-column hints, and JSON-to-YAML output keeps a clean 2-space indent. Everything runs locally in your browser, so configs containing secrets stay safe.

How to Use

Paste JSON or YAML
Choose the conversion direction (or let it auto-detect)
Copy the converted result

FAQ

What are the most common YAML syntax errors?: Indenting with Tab (YAML only allows spaces), missing the space after a key (it must be key: value), and unquoted values starting with a colon or hash.
Are comments lost in conversion?: JSON does not support comments, so YAML-to-JSON drops them; the reverse direction cannot restore them either.
Is multi-document YAML (--- separated) supported?: Input is parsed as a single document; for multi-document files, split them and convert one by one.

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Last updated 2026-09-04