Node.js RESTful API Endpoint for Building a GraphQL API with Apollo Server

Here's how to create a Node.js RESTful API endpoint to serve a GraphQL API using Apollo Server:

🚀 Setting Up Your Node.js Project

First, initialize your Node.js project and install the necessary packages:

mkdir graphql-api
cd graphql-api
npm init -y
npm install apollo-server express graphql

⚙️ Creating the Express Server

Next, set up your Express server. This will act as the RESTful endpoint.

// index.js
const express = require('express');
const { ApolloServer } = require('apollo-server-express');
const { typeDefs, resolvers } = require('./schema');

const app = express();

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

  await server.start();
  server.applyMiddleware({ app, path: '/graphql' });

  const PORT = process.env.PORT || 4000;
  app.listen(PORT, () => {
    console.log(`Server running on http://localhost:${PORT}/graphql`);
  });
}

startApolloServer();

📝 Defining the GraphQL Schema

Create your GraphQL schema. This includes type definitions and resolvers.

// schema.js
const { gql } = require('apollo-server-express');

// Type definitions (schema)
const typeDefs = gql`
  type Book {
    title: String
    author: String
  }

  type Query {
    books: [Book]
  }
`;

// Resolvers
const resolvers = {
  Query: {
    books: () => {
      return [
        { title: 'The Awakening', author: 'Kate Chopin' },
        { title: 'City of Glass', author: 'Paul Auster' },
      ];
    },
  },
};

module.exports = { typeDefs, resolvers };

🔗 Connecting Apollo Server to Express

In the main `index.js` file, Apollo Server is connected as middleware to the Express app.

▶️ Running the Application

To run the application, execute:

node index.js

This will start the server, and you can access the GraphQL API at `http://localhost:4000/graphql`.

✅ Summary

• ✅ Initialize a Node.js project.
• ✅ Install necessary packages (apollo-server-express, express, graphql).
• ✅ Create an Express server.
• ✅ Define your GraphQL schema (type definitions and resolvers).
• ✅ Connect Apollo Server to the Express app as middleware.
• ✅ Run the application.

This setup provides a RESTful endpoint (`/graphql`) that serves your GraphQL API using Apollo Server.