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YAML to JSON / JSON to YAML Converter
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Config files often live in YAML, but application code frequently needs the same data as JSON, and switching between the two by hand is slow and error-prone given how differently they represent structure. This bidirectional converter transforms YAML into JSON or JSON back into YAML in either direction, correctly preserving nested mappings, sequences, and data types along the way. It's a staple for DevOps engineers moving Kubernetes and Docker Compose configs into JSON-based tooling, and developers who prefer authoring in YAML but need JSON at runtime. Comments in YAML are necessarily dropped when converting to JSON, since JSON has no comment syntax, but everything else carries over faithfully. Since conversion happens entirely in your browser, your data is never uploaded to a server, and there's no signup required. Paste your YAML or JSON below to convert it instantly.
Features
- Converts YAML to JSON and JSON to YAML in either direction
- Preserves nested mappings, sequences, and scalar types
- Correctly maps YAML anchors and aliases during conversion
- Configurable JSON indentation for the output
- Validates input before converting to catch syntax errors
- Instant copy-to-clipboard or file download
- Live preview of the converted output
- Fully client-side with no data upload
Why use this yaml to json / json to yaml converter?
- Switches between formats instantly in either direction
- Keeps configuration data private with local-only processing
- Preserves data types and structure accurately
- One tool for both conversion directions, no separate pages
- Free with unlimited conversions
Frequently asked questions
Can this tool convert both YAML to JSON and JSON to YAML?
Yes, it's fully bidirectional - paste either format and the tool detects and converts it to the other.
What happens to YAML comments when converting to JSON?
Comments are dropped during conversion to JSON since the JSON specification has no comment syntax; the underlying data values are unaffected.
Does it handle YAML anchors and aliases correctly?
Yes, anchors and aliases are resolved to their referenced values so the resulting JSON contains the fully expanded data.
Is my configuration data uploaded during conversion?
No, the entire conversion runs locally in your browser using client-side JavaScript - nothing is sent to a server.
Can I convert a Kubernetes manifest with this tool?
Yes, standard Kubernetes YAML manifests convert cleanly to JSON since they follow standard YAML mapping and sequence syntax.
Does the converter validate my input first?
Yes, invalid YAML or JSON is flagged with an error before conversion, so you know the output is based on valid source data.
Can I control the indentation of the JSON output?
Yes, you can choose your preferred indent width when converting YAML to JSON for readability.