json-turtle https://jsonnet.org/ https://json-schema.org/draft/2020-12/json-schema-core.html https://github.com/sagold/json-schema-library https://www.npmjs.com/package/json-st https://www.npmjs.com/package/jsonschema https://www.npmjs.com/package/ajv https://www.npmjs.com/package/avsc