IntrospectionQueryTypeQuery.js

query IntrospectionQueryTypeQuery {
  __schema {
    queryType {
      name
      fields {
        name
        description
        type { 
          name
          kind
        }
        args { 
          name
          type { 
            name
            kind 
            ofType { 
              name
              kind
            }
          }
        }
      }
    }
  }
}

IntrospectionQueryTypeResponse.json

{
  "data": {
    "__schema": {
      "queryType": {
        "name": "Query",
        "fields": [
          {
            "name": "movie",
            "description": "Find a movie, series or epidsode by its title",
            "type": {
              "name": "Movie",
              "kind": "OBJECT"
            },
            "args": [
              {
                "name": "title",
                "type": {
                  "name": null,
                  "kind": "NON_NULL",
                  "ofType": {
                    "name": "String",
                    "kind": "SCALAR"
                  }
                }
              }
            ]
          }
        ]
      }
    }
  }
}