curl

curl -X POST \
-H "Content-Type: application/json" \
-d '{ "query": "{ getBook(id: 5) { title } }" }' \
http://localhost:4000/graphql

query

query {
  getBook(id: 3) {
    title
    author {
      name
    }
  }      
  getBookPromise(id: 3) {
    id
    title
  }
}

mutation

mutation {
  createBook(id: 3, title: "abc", authorName: "efg") {
    id
    title
    author {
      name
    }
  }
}