GraphQLskeemat

GraphQLskeemat is the schema that defines a GraphQL API's structure and capabilities. It describes the available types and operations that clients can request. The schema is typically authored in GraphQL's Schema Definition Language (SDL) or built programmatically and loaded at runtime. The core building blocks include object types that describe data shaped as a set of fields; the Query type that defines read operations; the Mutation type for write operations; the Subscription type for real-time updates. Each field has a type, may accept arguments, and may be non-null or a list. The type system includes scalar types (Int, Float, String, Boolean, ID), custom scalars, enums, input object types for structured inputs, interfaces and unions for polymorphism, and directives such as @deprecated and @include.

The schema serves as a contract between server and client and supports introspection, allowing clients to query the schema for its structure and capabilities. Resolvers provide the implementation behind each field; they fetch and assemble data according to the shape defined by the schema.

Versioning and evolution are managed through deprecation cues, field removals, and schema reviews. Tooling supports validation, code generation, and schema stitching or federation when combining multiple services.

In practice, the GraphQLskeemat is the single source of truth for API shape in many teams, enabling strongly typed queries and predictable data fetching. It is deployed alongside runtime logic and connected to data sources via resolvers, data loaders, and network calls.