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apollo-server-express

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    apollo-server-express

Production-ready Node.js GraphQL server for Express and Connect


Version published
Weekly downloads
805K
decreased by-0.94%
Maintainers
6
Install size
3.27 MB
Created
Weekly downloads
 

Package description

What is apollo-server-express?

The apollo-server-express package is a library that allows you to integrate Apollo Server with an Express application. It provides tools to build a GraphQL server with Express, enabling you to define your GraphQL schema, resolvers, and context, and to handle HTTP requests and responses.

What are apollo-server-express's main functionalities?

Setting up a basic Apollo Server with Express

This code sets up a basic Apollo Server with Express. It defines a simple GraphQL schema with a single query and a resolver for that query. The Apollo Server is then applied as middleware to the Express app, and the server is started on port 4000.

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

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

const resolvers = {
  Query: {
    hello: () => 'Hello world!',
  },
};

const server = new ApolloServer({ typeDefs, resolvers });
const app = express();
server.applyMiddleware({ app });

app.listen({ port: 4000 }, () =>
  console.log(`Server ready at http://localhost:4000${server.graphqlPath}`)
);

Adding context to Apollo Server

This code demonstrates how to add context to the Apollo Server. The context function extracts the user from the request headers and makes it available to the resolvers. The resolver for the 'hello' query uses the context to personalize the response.

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

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

const resolvers = {
  Query: {
    hello: (parent, args, context) => `Hello ${context.user}!`,
  },
};

const server = new ApolloServer({ 
  typeDefs, 
  resolvers, 
  context: ({ req }) => ({ user: req.headers.user || 'world' }) 
});
const app = express();
server.applyMiddleware({ app });

app.listen({ port: 4000 }, () =>
  console.log(`Server ready at http://localhost:4000${server.graphqlPath}`)
);

Using Apollo Server with Express middleware

This code shows how to use Apollo Server with other Express middleware. In this example, the body-parser middleware is used to parse JSON request bodies before the Apollo Server middleware is applied.

const express = require('express');
const { ApolloServer, gql } = require('apollo-server-express');
const bodyParser = require('body-parser');

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

const resolvers = {
  Query: {
    hello: () => 'Hello world!',
  },
};

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

app.use(bodyParser.json());
server.applyMiddleware({ app });

app.listen({ port: 4000 }, () =>
  console.log(`Server ready at http://localhost:4000${server.graphqlPath}`)
);

Other packages similar to apollo-server-express

Readme

Source

title: Express / Connect description: Setting up Apollo Server with Express.js or Connect

npm version Build Status Coverage Status Get on Slack

This is the Express and Connect integration of GraphQL Server. Apollo Server is a community-maintained open-source GraphQL server that works with all Node.js HTTP server frameworks: Express, Connect, Hapi, Koa and Restify. Read the docs. Read the CHANGELOG.

npm install apollo-server-express

Express

import express from 'express';
import bodyParser from 'body-parser';
import { graphqlExpress } from 'apollo-server-express';

const myGraphQLSchema = // ... define or import your schema here!
const PORT = 3000;

const app = express();

// bodyParser is needed just for POST.
app.use('/graphql', bodyParser.json(), graphqlExpress({ schema: myGraphQLSchema }));

app.listen(PORT);

Connect

import connect from 'connect';
import bodyParser from 'body-parser';
import { graphqlConnect } from 'apollo-server-express';
import http from 'http';

const PORT = 3000;

const app = connect();

// bodyParser is needed just for POST.
app.use('/graphql', bodyParser.json());
app.use('/graphql', graphqlConnect({ schema: myGraphQLSchema }));

http.createServer(app).listen(PORT);

Principles

GraphQL Server is built with the following principles in mind:

  • By the community, for the community: GraphQL Server's development is driven by the needs of developers
  • Simplicity: by keeping things simple, GraphQL Server is easier to use, easier to contribute to, and more secure
  • Performance: GraphQL Server is well-tested and production-ready - no modifications needed

Anyone is welcome to contribute to GraphQL Server, just read CONTRIBUTING.md, take a look at the roadmap and make your first PR!

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Last updated on 13 Jul 2018

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