graphql_query_mutation_subscriptions.js

fragment typeField on __Type {
  name
  fields {
    name
  }
}
query roots {
  __schema {
    queryType{
      ...typeField
    }
    mutationType {
      ...typeField
    }
    subscriptionType{
      ...typeField
    }
  }
}

use this snippet in GraphiQl or the playground to find out what Queries, Mutations and Subscriptions you can run on a given graphql API