YAML to JSON
Convert YAML ↔ JSON with validation.
100% private — runs in your browser, nothing is uploaded.
{
"server": {
"host": "example.com",
"port": 8080
},
"features": [
"auth",
"logging"
],
"debug": false
}Parsed locally in your browser — configs and secrets never leave your device.
How to use the YAML to JSON
- 1Pick a direction
YAML → JSON or JSON → YAML.
- 2Paste the document
Kubernetes manifests, CI configs, OpenAPI specs — anything.
- 3Read or fix errors
Parse errors show the exact line and reason.
- 4Copy or round-trip
Copy the output, or feed it back to convert the other way.
Examples
| Input | Output |
|---|---|
port: 8080 | { "port": 8080 } |
features:
- auth | { "features": ["auth"] } |
YAML and JSON, converted both ways
This YAML to JSON converter translates between the two formats instantly and accurately, using the same parser most developer tooling relies on. Paste a Kubernetes manifest, GitHub Actions workflow, docker-compose file or OpenAPI spec and see exactly what data structure it represents — or turn a JSON payload into clean YAML for a config file.
See what YAML really parses to
YAML's human-friendly syntax hides sharp edges: unquoted no becomes false, version numbers like 3.10 silently become 3.1, and indentation typos re-nest whole sections. Converting to JSON makes the parsed structure explicit, which is the fastest way to debug a config file that's “valid but wrong.” The round-trip button lets you verify a conversion is lossless in one click.
Safe for real configs
Config files often contain tokens and passwords, so this tool runs entirely in your browser — nothing is transmitted. For related work, the JSON formatter validates and pretty-prints JSON, and the XML formatter covers the third config format of the enterprise world.
Frequently Asked Questions
How do I convert YAML to JSON?
Paste your YAML into the input and the equivalent JSON appears instantly, pretty-printed with 2-space indentation. Errors in the YAML show the parser's message with the line it failed on.
Can I convert JSON back to YAML?
Yes — switch to JSON → YAML mode, or click 'Use result as input' to round-trip a document and confirm the conversion is lossless.
Is every YAML file convertible to JSON?
Almost. YAML is a superset of JSON for data, but a few YAML features have no JSON equivalent — comments are dropped, anchors/aliases are expanded into copies, and non-string map keys get stringified.
Why did my unquoted YAML value change type?
YAML guesses types: 'no' can become false, '3.10' a number, and '0x1A' an integer. If a value must stay a string, quote it in the YAML. The JSON output shows exactly how the parser interpreted everything — which is a great way to debug such surprises.
Which YAML version is supported?
The tool uses the widely-adopted js-yaml parser (YAML 1.2 with common 1.1 conveniences) — the same behavior as most CI systems and Kubernetes tooling.
Are my config files uploaded?
No. Parsing runs entirely in your browser — safe for configs that contain secrets.