Server Development / GraphQL
Servers
A closer look at Servers.
Resolvers and execution
Resolvers connect schema fields to data sources. This chapter explains the four resolver arguments, default resolvers, parallel query execution, per- request context, the N+1 problem, DataLoader, and how errors bubble through nullable fields.
Building a GraphQL server with NestJS
NestJS can expose a code-first GraphQL API with the Apollo driver, auto- generated SDL, decorators for types and resolvers, validation pipes, request- scoped DataLoaders, and graphql-ws subscriptions. This runbook walks from install to a working endpoint.
Schema design in GraphQL
Good GraphQL schemas mirror how clients use data, not how tables are joined. This chapter covers query-driven design, naming and nullability, Relay-style connections, mutation payloads, and modeling errors as typed results versus the top-level errors array.