YAML to JSON
Convert YAML configuration files into structured JSON documents (or JSON to YAML) instantly. · Updated
YAML to JSON is a daily bridge for Kubernetes, Docker Compose, GitHub Actions, and CI configs. This converter runs entirely in the browser with js-yaml so secrets in manifests never leave your machine. Flip Conversion Mode for JSON → YAML when you need readable diffs, set indent to 0 for compact JSON, and pair with YAML ↔ TOML when you move between ecosystems.
Common errors and fixes
bad indentation of a mapping entry
Align nested keys under their parent with consistent spaces (never mix tabs). Every child must be indented further than its parent.
unexpected end of the stream within a flow collection
Close all [ ] or { } flow collections. A truncated paste often leaves an unclosed bracket.
Why it happens, with a live exampleduplicated mapping key
YAML object keys must be unique at each level. Rename or merge the duplicate key.
JSON parse failed in reverse mode
When converting JSON → YAML, paste a single valid JSON value. Trailing commas and single-quoted keys are invalid JSON.
Options
| Option | Description |
|---|---|
| Conversion Mode | Select whether to convert from YAML to JSON or reverse JSON to clean YAML. |
| Indent size | Indentation spaces for output (0 for minified JSON). |
FAQ
Does this tool support Kubernetes and Docker Compose YAML files?
Yes. All standard YAML specifications (including multi-line strings, lists, maps, and typed values) are fully supported.
Can I convert JSON back to YAML?
Yes. Switch the Conversion Mode option to 'JSON → YAML' to generate clean, readable YAML markup from JSON.
How does it handle YAML syntax errors?
If an indentation or unquoted character error is detected, the exact error reason and line location will be highlighted.
Can I output minified JSON?
Yes. Set 'Indent size' to 0 when converting YAML to JSON.