JSON to YAML Converter Online
Description
Convert JSON to YAML and YAML to JSON with instant validation and formatting — client-side, ideal for config files and data interchange.
About JSON to YAML Converter Online
The JSON ↔ YAML Converter transforms data between JSON and YAML in both directions, with validation, entirely in your browser. JSON is compact and ubiquitous in APIs; YAML is more readable and common in configuration files (CI pipelines, Kubernetes, Docker Compose). This tool lets you move a structure between the two without hand-editing, preserving nesting, arrays, and types.
How to use
- Paste JSON to convert it to YAML, or paste YAML to convert it to JSON.
- The converted output appears instantly with formatting applied.
- Invalid input is flagged so you can fix syntax before converting.
- Copy the result into your config file or API request.
Examples
| Example | Input | Output |
|---|---|---|
| JSON → YAML | {"name":"app"} | name: app |
Frequently asked questions
Is YAML a superset of JSON?
Yes. Any valid JSON is also valid YAML, so JSON pasted into a YAML parser works. The reverse isn't true — YAML has features (comments, anchors, multiple documents) that JSON cannot express.
What happens to YAML comments when converting to JSON?
They are dropped. JSON has no comment syntax, so comments cannot be represented and are lost in the conversion to JSON.
Why did my YAML number turn into a string (or vice versa)?
YAML infers types from formatting: unquoted numbers become numbers and true/false become booleans. Quote a value to force it to stay a string. Note that some YAML 1.1 tools also treat yes/no/on/off as booleans — a common surprise when moving configs between tools.
Does the data leave my browser?
No. Conversion and validation run locally — useful for config files that may contain secrets.