YAML to JSON Converter
Convert YAML to JSON and JSON to YAML instantly — free, private, and runs entirely in your browser. No upload, no sign-up.
Paste YAML above and press Convert to see the JSON output.
Everything runs entirely in your browser — your data is never uploaded or sent to a server.
YAML and JSON are the two formats you reach for most when working with configuration. JSON is compact and universally parseable, while YAML is human-friendly and dominates tools like Docker Compose, Kubernetes, GitHub Actions, and CI pipelines. This converter moves data between the two instantly — no upload, no account, and no server round-trip.
How to convert YAML to JSON
Select YAML → JSON, paste your YAML, and press Convert. The tool parses your document with the battle-tested js-yaml library and emits clean, two-space pretty-printed JSON. Scalar types are preserved: 3 stays a number, true stays a boolean, and null stays null rather than becoming a string.
How to convert JSON to YAML
Switch to JSON → YAML and paste a JSON object or array. The output is valid YAML with readable indentation, and long values are emitted on a single line so your diffs stay clean. Use the Swap button to flip directions and feed the output straight back in — handy for round-tripping and sanity-checking a config.
Common use cases
- CI and DevOps: Convert a JSON snippet from an API into the YAML your pipeline expects, or vice versa.
- Config migration: Move settings between a JSON-based app and a YAML-based deployment manifest.
- Debugging: Flatten dense YAML into JSON to spot a misplaced key or unexpected type.
- Documentation: Generate readable YAML examples from JSON payloads for your README.
Everything is processed locally in your browser. Because nothing is transmitted, you can safely convert sensitive configuration, environment files, or internal data without it ever leaving your machine.
Frequently Asked Questions
Is my YAML or JSON uploaded to a server?↓
No. Conversion runs entirely in your browser using the open-source js-yaml library. Your YAML and JSON never leave your device, so you can safely paste config files, secrets, or internal data.
How do I convert YAML to JSON?↓
Choose "YAML → JSON" in the Direction selector, paste your YAML into the input box, and press Convert. The parsed result is pretty-printed JSON that you can copy with one click. Use the Swap button to instantly flip the conversion back to YAML.
Why does my YAML fail to parse?↓
YAML is whitespace-sensitive, so inconsistent indentation, tabs instead of spaces, or an unclosed flow collection (like a stray "]" or "}") will raise a parse error. The tool shows a friendly "Invalid YAML" message describing the problem so you can fix the offending line.
Does the converter handle nested objects, arrays, and types?↓
Yes. Nested mappings become nested JSON objects, YAML sequences become JSON arrays, and scalar types like numbers, booleans, and null are preserved. When converting JSON to YAML, long lines are kept on a single line for clean, diff-friendly output.