JSON

1. https://www.json.org/
2. https://jsonlines.org/
3. https://json-ld.org/
   1. https://www.iana.org/assignments/media-types/application/ld+json

Supersets

1. https://json5.org/ superset of JSON - "The JSON5 Data Interchange Format is a proposed extension to JSON that aims to make it easier for humans to write and maintain by hand. It does this by adding some minimal syntax features directly from ECMAScript 5.1."
2. https://hjson.github.io/ HJSON
3. https://yaml.org/ since YAML 1.2