proxy and edit graphql response

proxy-graphql.js

const express = require('express');
const bodyParser = require('body-parser');
const axios = require('axios');
const app = express();
const cors = require('cors');

app.use(cors());
app.use(bodyParser.json());
const backend = 'https://marketplace-api.qa.kamereo.vn/graphql';

app.post('/graphql', function(req, res) {
  axios
    .post(backend, req.body)
    .then(function(response) {
      try {
        const {data, errors, dataPresent, extensions} = response.data;
        res.json({
          data,
          errors: errors.length > 0 ? errors : null,
          dataPresent,
          extensions,
        });
      } catch (error) {
        console.error(error);
        res.json({});
      }
    })
    .catch(function(error) {
      console.log(error);
    });
});

const server = require('http').createServer(app);

server.listen(3333);