Create an index.js file and add the following code:
const express = require('express');
const { ApolloServer, gql } = require('apollo-server-express');
// Sample data
let books = [
{ title: 'The Great Gatsby', author: 'F. Scott Fitzgerald' },
{ title: 'To Kill a Mockingbird', author: 'Harper Lee' },
];
// GraphQL schema definition
const typeDefs = gql`
type Book {
title: String!
author: String!
}
type Query {
books: [Book]
}
type Mutation {
addBook(title: String!, author: String!): Book
}
`;
// GraphQL resolvers
const resolvers = {
Query: {
books: () => books,
},
Mutation: {
addBook: (_, { title, author }) => {
const newBook = { title, author };
books.push(newBook);
return newBook;
},
},
};
// Create Apollo server
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}`)
);