GraphQL API

Overview

GraphQL provides a flexible query language for APIs with precise data requirements. This skill should be invoked when building flexible APIs needing nested data fetching, multiple data source aggregation, or client-controlled queries.

Core Principles

• Schema-Driven: Define types, queries, mutations in schema
• Resolver Implementation: Map schema fields to data sources
• DataLoader: Prevent N+1 queries with batching
• Validation: Validate inputs and handle errors properly

Preparation Checklist

• Choose GraphQL server (Apollo, GraphQL Yoga, Mercury)
• Design schema with types, queries, mutations
• Plan resolver structure
• Set up DataLoader for optimization