server.js

//server js file
require('dotenv').config({ path: '.env' });

const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');
const Pusher = require('pusher');

const app = express();

//defining the credentials of the pusher channels instance, so that the code can be stored and accessed by multiple users for collaboration.
const pusher = new Pusher({
  appId: process.env.PUSHER_APP_ID,
  key: process.env.PUSHER_APP_KEY,
  secret: process.env.PUSHER_APP_SECRET,
  cluster: process.env.PUSHER_APP_CLUSTER,
  useTLS: true,
});

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


//endpoint triggering pusher instance
app.post('/update-editor', (req, res) => {
  pusher.trigger('editor', 'text-update', {
   ...req.body,
  });

  res.status(200).send('OK');
});

//backend on port 500, or can be defined in .env file
app.set('port', process.env.PORT || 5000);
const server = app.listen(app.get('port'), () => {
  console.log(`Express running → PORT ${server.address().port}`);
});