04-Usa-GraphiQL-como-GraphQL-IDE.js

const express = require('express');
const bodyParser = require('body-parser');
// 1. Importamos `graphiqlExpress`.
const { graphqlExpress, graphiqlExpress } = require('graphql-server-express');
const { makeExecutableSchema } = require('graphql-tools');

const typeDefs = [
  `
  type Query {
    hello: String
  }

  schema {
    query: Query
  }
`
];

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

const executableSchema = makeExecutableSchema({ typeDefs, resolvers });
const app = express();

app.use(
  '/graphql',
  bodyParser.json(),
  graphqlExpress({ schema: executableSchema })
);

// 2. Creamos un endpoint llamado `/graphiql` para GraphiQL. Usamos
// `graphiqlExpress` e indicamos el slug dónde se encuentra nuestro servidor
// GraphQL (/graphql).
app.use('/graphiql', graphiqlExpress({ endpointURL: '/graphql' }));

app.listen(4000, () => console.log('Ready! localhost:4000/graphiql'));