Also in the Json the "query" is actually a string that is in GraphQL language. So GraphQL is an encoded format embedded inside Json. { "query": "mutation Foo

Also in the Json the "query" is actually a string that is in GraphQL language. So GraphQL is an encoded format embedded inside Json. { "query": "mutation Foo() { ... }" } As such type safety is dependent on the query langauge (graphQL) not Json. As far as the Json goes, it might as well be multi-part form encoded.