How to Build a GraphQL API
Design and implement a GraphQL API with schemas, resolvers, and best practices.
What You'll Learn
This intermediate-level guide walks you through how to build a graphql api step by step. Estimated time: 14 min.
Step 1: Design your schema
Define types, queries, mutations, and subscriptions that model your domain using SDL.
Step 2: Set up the server
Initialize Apollo Server or Yoga with your schema and connect to your database layer.
Step 3: Implement resolvers
Write resolver functions for each query and mutation with proper data fetching and error handling.
Step 4: Add authentication
Implement context-based auth that validates tokens and passes user info to resolvers.
Step 5: Optimize performance
Add DataLoader for N+1 query prevention, implement query complexity limits, and add caching.
Frequently Asked Questions
GraphQL or REST for my project?▾
GraphQL shines for complex UIs with varied data needs. REST is simpler for basic CRUD APIs. Many apps use both — GraphQL for frontend, REST for third-party integrations.
How do I prevent expensive queries?▾
Implement query depth limiting, complexity analysis, and rate limiting. Use persisted queries in production to prevent arbitrary queries.
Which GraphQL server should I use?▾
Apollo Server is the most popular with great tooling. Yoga is lighter and more performant. Choose based on your ecosystem and feature needs.