Free JSON ⇄ YAML Converter
Convert between JSON and YAML.
What is the JSON ⇄ YAML Converter?
JSON and YAML describe the same kind of structured data, but different tools prefer different formats — APIs lean on JSON, while CI pipelines, Kubernetes and many config files use YAML. Moving between them by hand is fiddly and easy to get wrong on indentation.
This converter turns JSON into YAML and YAML into JSON instantly, validating the input as it goes, right in your browser.
Last updated: Aug 12, 2026
What does this tool do?
You paste JSON or YAML, choose the direction, and the tool parses the input and re-serializes it in the other format.
Because it parses first, invalid input is reported with an error rather than producing broken output, so you catch problems early.
Key features
Both directions
JSON to YAML and YAML to JSON.
Validation
Invalid input is flagged with an error.
Data preserved
The same data, re-serialized cleanly.
Copy-ready output
Grab the result in one click.
Private
Conversion runs in your browser.
Example
Common use cases
- DevOps engineers — Convert configs between formats.
- Developers — Turn API JSON into readable YAML.
- Kubernetes users — Move between manifest and JSON forms.
- Sysadmins — Reformat configuration files.
- Students — Learn how the two formats relate.
- Data engineers — Convert data files for different tools.
- Technical writers — Show examples in both formats.
- No-code builders — Adapt data to what a tool expects.
Benefits
- It bridges JSON tools and YAML tools in one step.
- Validation catches errors before they spread.
- It preserves your data exactly.
- Your data never leaves the browser.
Tips
- YAML uses spaces, never tabs, for indentation.
- JSON needs double quotes; YAML often needs none.
- Quote YAML strings that contain colons or special characters.
- Watch YAML's implicit booleans — yes, no, on and off parse as true/false.
- Comments exist in YAML but not JSON, so they're dropped when converting to JSON.
- If conversion fails, check the reported line for a syntax issue.
- Format the JSON output further with the JSON formatter if needed.
- Round-trip carefully — YAML-only features don't map to JSON.
Common mistakes to avoid
Tabs in YAML
Fix: YAML requires spaces for indentation — replace any tabs.
Expecting comments to survive to JSON
Fix: JSON has no comments, so YAML comments are dropped in that direction.
Unquoted special characters in YAML
Fix: Quote values with colons, hashes or leading symbols.
Assuming all YAML maps to JSON
Fix: Some advanced YAML features have no JSON equivalent.
How it works
- 1
Paste JSON or YAML
Add your content.
- 2
Choose direction
JSON to YAML or the reverse.
- 3
Copy
Grab the converted output.
Frequently asked questions
Yes. Invalid JSON or YAML is reported with an error so you can fix it.
Yes — it re-serializes the same data in the other format.
Yes. Invalid JSON or YAML is reported with an error so you can fix it.
Yes — it re-serializes the same data in the other format.
They're dropped when converting to JSON, since JSON doesn't support comments.
Common causes are tabs instead of spaces, bad indentation, or an unquoted special character.
Yes. Switch the direction to go JSON to YAML or YAML to JSON.
No. Conversion happens entirely in your browser.
Conclusion
A JSON-YAML converter bridges the formats your different tools expect, with validation built in. Pair it with the JSON and YAML formatters for cleaning up either format.