Phase 9 · API Design
TopicsGraphQL Schema & Resolvers
Part of the Backend Developer Roadmap.
Summary
The schema defines your API's types and operations; resolvers are the functions that actually fetch the data for each field — together they form a working GraphQL API.
How to Learn This
- 1Define types, queries and mutations in a GraphQL schema.
- 2Write resolvers that fetch data from a database for each field.
- 3Learn the N+1 query problem in GraphQL and how DataLoader solves it.
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