What is GraphQL?

GraphQL is a new language that has changed how a web server exposes data and how the client consumes it. Considering our application’s data structure, we could map every data source to a graph of nodes (objects) and edges (relations) to connect them.

Here’s a quick example of a GraphQL query that maps a family and its members:

query {
  family(id: 5) {
    id
    members {
      fullName
      friends {
        fullName
      }
    }
  }
}

By reading our first GraphQL query, we can immediately understand the relation hierarchy. A Family entity has many Person as a members array property. Each item of members may have some Person entities as friends. Commonly, a GQL request string is called a GQL document.

The JSON response to our GQL...