Add a new related topic

Author: benjagm

topics/json-schema/index.md

@@ -9,6 +9,6 @@ short_description: JSON Schema is a vocabulary that allows you to validate, anno
 topic: json-schema
 url: https://json-schema.org/
 github_url: https://github.com/json-schema-org
-related: json
+related: json, api
 ---
 While JSON is probably the most popular format for exchanging data, **JSON Schema** is the vocabulary that enables JSON data consistency, validity, and interoperability at scale.