Developers
JSON ↔ YAML Converter
JSON to YAML, YAML to JSON — clean, instant conversion in your browser.
An API hands you JSON, your CI/CD pipeline expects YAML — or the other way round: a Kubernetes manifest you need as JSON for an API call. Instead of rewriting the structure by hand and risking an indentation slip, paste your document here and convert it in either direction. Syntax is checked along the way: badly indented YAML or invalid JSON is flagged immediately rather than failing later in your deployment. Types are preserved — strings, numbers, booleans, lists, nested objects. Everything runs in your browser, so your configuration files never leave your machine. Free, unlimited, and no account required.
How does it work?
- Paste your JSON or YAML document into the input area.
- Click “To YAML” or “To JSON” depending on the direction you need.
- Check the result — syntax errors are reported immediately.
- Copy the output with one click.
Frequently asked questions
Why is YAML so popular for configuration?
Because it is easier for humans to read than JSON: no mandatory braces or quotes, structure by indentation and — crucially — comments, which JSON does not support. That is why Kubernetes, GitHub Actions, Docker Compose and most CI/CD tools standardised on it.
What are the classic YAML pitfalls?
Indentation first: one extra space changes the structure, and tabs are forbidden. Then implicit typing: depending on the parser version, “no”, “yes” or “on” may become booleans, and a value like 07500 can lose its leading zero. When in doubt, quote the value.
Is JSON a subset of YAML?
Yes, since YAML 1.2: every valid JSON document is also valid YAML, so a YAML parser will read your JSON as-is. The reverse is not true — YAML has features (comments, anchors, multi-document files) with no JSON equivalent.
Are my YAML comments kept when converting to JSON?
No, and no converter can keep them: JSON simply has no comment syntax, so they are dropped in the YAML → JSON direction. If you need to round-trip, keep the commented YAML version as your source of truth.