Simple GraphQL proxy

server.js

var express = require('express');
var graphqlHTTP = require('express-graphql');
var { buildSchema } = require('graphql');
var fetch = require('node-fetch');

// Construct a schema, using GraphQL schema language
var schema = buildSchema(`
  type User {
    first_name: String
    last_name: String
    email: String
  }

  type Query {
    getUsers: [User]
  }
`);

// The root provides a resolver function for each API endpoint
var root = {
  getUsers: () => {
    return fetch('http://localhost:5000/users').then(
      function(response) {
        return response.json();
     }
    );
  }
};

var app = express();
app.use('/graphql', graphqlHTTP({
  schema: schema,
  rootValue: root,
  graphiql: true,
}));
app.listen(4000);
console.log('Running a GraphQL API server at localhost:4000/graphql');