text: const express = require('express');
  const dotenv = require('dotenv');
  dotenv.config();
  const cors = require('cors');
  const connectDB = require('./config/db');
  const path = require('path');
  
  const app = express();
  
  // Init middleware
  app.use(express.json({ limit: '30mb', extended: true }));
  app.use(express.urlencoded({ limit: '30mb', extended: true }));
  app.use(cors());
  
  // connect database
  connectDB();
  
  app.get('/api', (req, res) => {
    res.send('Welcome To mantha');
  });
  
  //// define routes
  app.use('/api/users', require('./routes/api/user'));
  app.use('/api/auth', require('./routes/api/auth'));
  app.use('/api/classrooms', require('./routes/api/classrooms'));
  app.use('/api/tests', require('./routes/api/tests'));
  
  if (process.env.NODE_ENV === 'production') {
    // Set static folder
    app.use(express.static('client/build'));
  
    app.get('*', (req, res) => {
      res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'));
    });
  }
  
  //
  const port = process.env.PORT || 5000;
  
  app.listen(port, () => console.log(`Server is running at ${port}`));
  