JSON ↔ YAML Converter

JSON and YAML describe the same kinds of data, objects, lists, strings, numbers and booleans, in different styles. JSON is stricter and common in APIs; YAML is easier for people to read and write, which is why Kubernetes, Docker Compose, GitHub Actions and many CI systems use it for configuration.

This converter switches between them in either direction, with your choice of indentation. Parse errors show the reason and location, which helps with YAML's whitespace rules. The conversion happens in your browser, so configs with internal hostnames never leave your device.

Every JSON document is valid YAML 1.2, so converting JSON to YAML only changes the style: braces and quotes give way to indentation and dashes. Going the other way, YAML features with no JSON equivalent, such as comments and anchors, are resolved or dropped.

The conversion uses the yaml library, which follows YAML 1.2, where yes and no are plain strings rather than booleans. That avoids the classic Norway problem, where the country code NO turned into false in YAML 1.1 parsers.