Apollo Server vs Express GraphQL: Key Differences and When to Use

Apollo Server is a full-featured GraphQL server with built-in tools for schema stitching, caching, and subscriptions, while Express GraphQL is a minimal middleware for integrating GraphQL into Express apps. Apollo Server offers more features and easier setup for complex apps, whereas Express GraphQL is lightweight and good for simple use cases.

Quick Comparison

Here is a quick side-by-side comparison of Apollo Server and Express GraphQL based on key factors.

Factor	Apollo Server	Express GraphQL
Setup Complexity	Simple with rich defaults	Very simple, minimal setup
Features	Schema stitching, caching, subscriptions, federation	Basic GraphQL execution
Performance	Optimized with caching and batching	Basic performance, no built-in optimizations
Community & Ecosystem	Large, active, many integrations	Smaller, minimal ecosystem
Use Case	Complex apps needing advanced features	Simple apps or learning GraphQL
Middleware Integration	Can integrate with Express, Koa, etc.	Built specifically as Express middleware

Key Differences

Apollo Server is designed as a complete GraphQL server solution. It includes advanced features like schema stitching to combine multiple schemas, built-in support for subscriptions (real-time data), caching, and performance optimizations such as query batching. Apollo also supports federation, which helps build a distributed GraphQL architecture.

On the other hand, Express GraphQL is a minimal middleware that simply adds GraphQL support to an Express app. It focuses on executing GraphQL queries and serving the GraphiQL interface but does not provide advanced features out of the box. This makes it lightweight and easy to understand but less suitable for complex applications.

In terms of community, Apollo Server has a larger ecosystem with many plugins and integrations, while Express GraphQL is maintained by the GraphQL Foundation and is more basic. Apollo Server also supports multiple Node.js frameworks beyond Express, whereas Express GraphQL is tightly coupled to Express.

Code Comparison

Here is how you create a simple GraphQL server that returns a greeting using Apollo Server.

javascript

import { ApolloServer, gql } from 'apollo-server';

const typeDefs = gql`
  type Query {
    hello: String
  }
`;

const resolvers = {
  Query: {
    hello: () => 'Hello from Apollo Server!'
  }
};

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

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

Output

Server ready at http://localhost:4000/

Express GraphQL Equivalent

Here is the equivalent simple GraphQL server using Express GraphQL middleware.

javascript

import express from 'express';
import { graphqlHTTP } from 'express-graphql';
import { buildSchema } from 'graphql';

const schema = buildSchema(`
  type Query {
    hello: String
  }
`);

const root = {
  hello: () => 'Hello from Express GraphQL!'
};

const app = express();

app.use('/graphql', graphqlHTTP({
  schema: schema,
  rootValue: root,
  graphiql: true
}));

app.listen(4000, () => {
  console.log('Server running at http://localhost:4000/graphql');
});

Output

Server running at http://localhost:4000/graphql

When to Use Which

Choose Apollo Server when building complex GraphQL APIs that require features like subscriptions, caching, schema stitching, or federation. It is ideal for production apps needing scalability and rich tooling.

Choose Express GraphQL for simple projects, prototypes, or learning GraphQL basics where minimal setup and lightweight middleware are preferred. It works well when you already use Express and want a quick GraphQL endpoint.

Key Takeaways

Apollo Server offers a full-featured GraphQL server with advanced capabilities and optimizations.

Express GraphQL is a minimal middleware focused on simplicity and easy integration with Express.

Use Apollo Server for complex, scalable apps and Express GraphQL for simple or learning projects.

Apollo Server supports multiple frameworks and has a larger ecosystem than Express GraphQL.

Both can serve GraphQL queries, but Apollo Server provides more built-in tools and features.