GraphQL Schema

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---
name: GraphQL Schema
description: Design GraphQL schemas and resolvers that scale.
---

# GraphQL Schema

Design a schema clients love and a server that doesn't fall over.

## Schema design

1. Model the graph around domain nouns, not your database tables.
2. Use the schema-first SDL as the contract; generate types from it.
3. Prefer non-null (`!`) by default; make a field nullable only when null is a real, meaningful value.
4. Return rich object types, not scalars, so the schema can evolve.

```graphql
type Query {
  order(id: ID!): Order
}
type Order {
  id: ID!
  status: OrderStatus!
  items: [LineItem!]!
  customer: Customer!… install to load the full skill