GraphQL Schema Design Best Practices
Design maintainable, scalable GraphQL schemas — types, resolvers, pagination, and naming conventions.
Published:
Tags: GraphQL schema design, GraphQL best practices, scalable GraphQL schema
GraphQL Schema Design Best Practices The GraphQL specification is the authoritative reference for schema design rules. The Relay Cursor Connections specification defines the pagination pattern widely adopted in GraphQL APIs. The GraphQL Foundation maintains official best practice guides. A well-designed GraphQL schema evolves without breaking clients, guides API consumers with self-documenting types, and maps to domain concepts rather than database tables. --- What is Start from the Client's Perspective? The most common schema design mistake is modeling the database directly. Instead, ask what data screens and features need and design types that serve those queries. What is Naming Conventions? | Element | Convention | Example | |---------|-----------|---------| | Types | PascalCase | , ,…
Frequently Asked Questions
How do I design a scalable GraphQL schema?
Use the Relay pagination spec (Connections), design from the client's perspective, avoid over-nesting, model domain concepts as types (not database tables), and use input types for mutations. Start with queries the UI needs, not database relationships.
What are the naming conventions for GraphQL?
Types use PascalCase (User, BlogPost). Fields use camelCase (firstName, createdAt). Mutations use imperative camelCase (createUser, deletePost). Enum values use UPPER_CASE (ACTIVE, PENDING_REVIEW). Input types end in `Input` (CreateUserInput). Connections end in `Connection` (UserConnection).
How do I implement pagination in GraphQL?
Use the Relay Cursor Connections spec: return a `Connection` type with `edges` (array of `Edge` types containing a `node` and a `cursor`) and `pageInfo` (hasNextPage, hasPreviousPage, startCursor, endCursor). Accept `first`, `after`, `last`, `before` arguments.
What are GraphQL connections?
Connections are the Relay pagination pattern for lists in GraphQL. A connection wraps a list with cursor-based pagination metadata. `UserConnection` has `edges: [UserEdge!]!` (each edge has `node: User` and `cursor: String`) and `pageInfo: PageInfo`. They enable efficient cursor-based pagination.
How do I handle errors in GraphQL?
GraphQL returns HTTP 200 even for domain errors. Add an `errors` array to the response for domain errors. A common pattern uses union types: `type CreateUserResult = User | ValidationError | NotFoundError`. This makes errors first-class and type-checkable by clients.
All articles · theproductguy.in