ApolloServerでGraphQLServerを構築する。

ApolloServerを利用してGraphQLのサーバを作成する事が目的です。

成果物

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ディレクトリ構成

~/develop/graphql/gql_server $ tree -I node_modules 
.
├── package.json
├── server.js
└── yarn.lock

0 directories, 3 files

package.json

{
  "name": "backend",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev": "node server.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "apollo-server": "^3.10.1",
    "graphql": "^16.6.0"
  },
  "dependencies": {
    "gql": "^1.1.2"
  }
}

server.js

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

const users = [
    {
        id: 1,
        name: 'kouji',
        email: '[e-mail]',
        age: 20,
    },
    {
        id: 2,
        name: 'takashi',
        email: '[e-mail]',
        age: 19,
    },
];

const typeDefs = gql`
    type User {
        name: String
        email: String
    }
    type Query {
        user: [User]
    }
`;

const resolvers = {
    Query: {
        user: () => users,
    },
};

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

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

→localhost:4000で実行！！すると、Apolloserverが起動する！！

GraphQLのクエリ

query ExampleQuery {
  user {
    name
    email
  }
}