apollo-server

Files (7)

• SKILL.md
• context-and-auth.md · references/
• data-sources.md · references/
• error-handling.md · references/
• plugins.md · references/
• resolvers.md · references/
• troubleshooting.md · references/

SKILL.md (first lines)

# Apollo Server 5.x Guide

Apollo Server is an open-source GraphQL server that works with any GraphQL schema. Apollo Server 5 is framework-agnostic and runs standalone or integrates with Express, Fastify, and serverless environments.

## Quick Start

### Step 1: Install

```bash
npm install @apollo/server graphql
```

For Express integration:

```bash
npm install @apollo/server @as-integrations/express5 express graphql cors
```

### Step 2: Define Schema

```typescript
const typeDefs = `#graphql
  type Book {
    title: String
    author: String
  }

  type Query {
    books: [Book]
  }
`;
```

### Step 3: Write Resolvers

```typescript
const resolvers = {
  Query: {
    books: () => [
      { title: "The Great Gatsby", author: "F. Scott Fitzgerald" },
      { title: "1984", author: "George Orwell" },
    ],
  },
};
```

### Step 4: Start Server

**Standalone (Recommended for prototyping):**

The standalone server is great for prototyping, but for production services, we recommend integrating Apollo Server with a more fully-featured web framework such as Express, Koa, or Fastify. Swapping from the standalone server to a web framework later is straightforward.

```typescript
import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";

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

const { url } = await startStandaloneServer(server, {
  listen: { port: 4000 },
});

console.log(`Server ready at ${url}`);
```

**Express:**

```typescript
import { ApolloServer } from "@apollo/server";
import { expressMiddleware } from "@as-integrations/express5";
import { ApolloServerPluginDrainHttpServer } from "@apollo/server/plugin/drainHttpServer";
import express from "express";
import http from "http";
import cors from "cors";

const app = express();
const httpServer = http.createServer(app);

const server = new ApolloServer({
  typeDefs,
  resolvers,
  plugins: [ApolloServerPluginDrainHttpServer({ httpServer })],
});

await server.start();

app.use(
  "/graphql",
  cors(),
  express.json(),
  expressMiddleware(server, {
    context: async ({ req }) => ({ token: req.headers.authorization }),
  }),
);

await new Promise<void>((resolve) => httpServer.listen({ port: 4000 }, resolve));
console.log("Server ready at http://localhost:4000/graphql");
```

## Schema Definition

### Scalar Types

- `Int` - 32-bit integer
- `Float` - Double-precision floating-point
- `String` - UTF-8 string
- `Boolean` - true/false
- `ID` - Unique identifier (serialized as String)

### Type Definitions

```graphql
type User {
  id: ID!
  name: String!
  email: String
  posts: [Post!]!
}

From relvorlabs/agent-controller, MIT.

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