GraphQL API Builder

This skill helps build GraphQL APIs.

When to Use

Use this skill when a user asks to:

• Create a GraphQL API
• Design a GraphQL schema
• Implement resolvers

How to Build a GraphQL API

Step 1: Design the Schema

Define types, queries, and mutations. Use assets/schema-template.graphql as a starting point.

Key elements:

• Types define data structures
• Queries fetch data
• Mutations modify data

Step 2: Implement Resolvers

Create resolver functions for each query and mutation. Use assets/resolver-template.js as a starting point.

Step 3: Set Up the Server

For Apollo Server:

const { ApolloServer } = require('apollo-server');

const server = new ApolloServer({ typeDefs, resolvers });

server.listen().then(({ url }) => {
  console.log(`Server ready at ${url}`);
});

Step 4: Add Authentication

Implement JWT authentication in the context:

const server = new ApolloServer({
  typeDefs,
  resolvers,
  context: ({ req }) => {
    const token = req.headers.authorization || '';
    const user = verifyToken(token);
    return { user };
  }
});

Step 5: Connect Database

Use an ORM like Prisma or Sequelize to connect to PostgreSQL.

Output

Generate the following files:

• schema.graphql - GraphQL schema
• resolvers.js - Resolver implementations
• server.js - Server setup