app.js

'use strict'
require('./config.js');
var express = require('express');
var bodyParser = require('body-parser');

var app = express();
var apiTwitter = require('./routes/twitter');

app.use(bodyParser.urlencoded({extended:false}));
app.use(bodyParser.json());

app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Headers', 'X-API-KEY, Origin, X-Requested-With, Content-Type, Accept, Access-Control-Request-Method');
  res.header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, DELETE');
  res.header('Allow', 'GET, POST, OPTIONS, PUT, DELETE');

  next();
});

app.use('/api', apiTwitter);

module.exports = app;