Which statement about GraphQL usage is correct?

Which statement about GraphQL usage is correct?

• A. It uses a single endpoint and clients request exactly the data they need.
• B. It always returns all fields for every type.
• C. It relies on REST URLs and HTTP methods.
• D. It uses Protocol Buffers for serialization.

Answer: (A)

The key idea being tested is that GraphQL lets clients request exactly the data they need through a single endpoint. With GraphQL, a client writes a query that specifies precisely which fields (and nested relationships) it wants, and the server responds with only those fields. This avoids fetching unnecessary data and makes additional requests unnecessary because you can traverse related data within one query. That’s why this statement is the best: it accurately captures GraphQL’s typical usage—one endpoint and precise data selection per query. In contrast, GraphQL does not always return all fields for every type; it returns only what the client asks for. It also does not rely on REST-style URLs and HTTP methods; GraphQL uses its own endpoint (often /graphql) and a query language delivered over HTTP. While JSON is the common format for responses, the protocol does not mandate Protocol Buffers as its serialization format.

The key idea being tested is that GraphQL lets clients request exactly the data they need through a single endpoint. With GraphQL, a client writes a query that specifies precisely which fields (and nested relationships) it wants, and the server responds with only those fields. This avoids fetching unnecessary data and makes additional requests unnecessary because you can traverse related data within one query.

That’s why this statement is the best: it accurately captures GraphQL’s typical usage—one endpoint and precise data selection per query.

In contrast, GraphQL does not always return all fields for every type; it returns only what the client asks for. It also does not rely on REST-style URLs and HTTP methods; GraphQL uses its own endpoint (often /graphql) and a query language delivered over HTTP. While JSON is the common format for responses, the protocol does not mandate Protocol Buffers as its serialization format.