To master GraphQL, you must learn its specific syntax. Abandon HTTP Verbs and embrace Queries and Mutations.
1The Mirror Effect
The defining characteristic of a GraphQL Query is that the JSON response perfectly mirrors the shape of the query. If your query opens an object called user and asks for name, the JSON response will be { data: { user: { name: 'Alice' } } }. This predictability is a massive improvement over REST, where the exact shape of the returned JSON often requires reading external documentation.
async function execute() {
// See concept above
}
2Consolidating Modifiers
GraphQL abandons the semantic debates of REST (Should this be a PUT or a PATCH?). All operations that cause a side effect (creating, updating, or deleting data) are classified as a mutation. A brilliant feature of mutations is that they are queries too. After updating a user's profile, you can simultaneously request the new updated profile data in the exact same network request, preventing the need for a follow-up GET request.
async function execute() {
// See concept above
}
3The Backend Logic (Resolvers)
The GraphQL magic isn't actually magic; it's just well-organized backend code. For every type and field defined in the Schema, there must be a matching 'Resolver' function. When a complex query arrives, the GraphQL engine executes the necessary resolvers in a tree-like fashion. The User resolver runs first to get the user ID, which is then passed down to the Posts resolver to fetch their posts.
async function execute() {
// See concept above
}
