github.com/wryun/yajsonschema (go): Package yajsonschema (yet another json schema [something]) is a tool which converts a schema written in yaml into a JSON schema (draft 4). i.e. it's primarily an easier way to write json schemas, but you can also use it directly.  However, you can only represent a subest of possible json schema documents.
Keywords: json|json-schema|json-schema-generator|json-validation|yaml|yaml-validator