index.js

/*
    The index.js file is the main entry point for the Express.js server. It sets up a tunnel using the setupLocalTunnel
    function, initializes an Express application, configures CORS headers for cross-origin requests, parses incoming JSON requests,
    defines routes using the routes module, and starts the server to listen on the specified port from the configuration.
*/


// Import necessary modules for building the Express.js server
const express = require("express");
const bodyParser = require("body-parser");
const cors = require('cors');

// Import the setupLocalTunnel function from the connection module
const setupLocalTunnel = require("./tunnel-setup/tunnelSetup");

// Create an instance of the Express application
const app = express();

// Import routes, configuration
const routes = require("./routes/requestRoutes");
const config = require("./config/config");

// Enable CORS (Cross-Origin Resource Sharing) with custom headers
app.use(cors());

// Parse incoming JSON requests
app.use(bodyParser.json());

// Use the defined routes for handling various endpoints
app.use("/", routes);

// Start the server, listening on the specified port from the configuration
app.listen(config.PORT, () => {
    console.log("\nServer listening on port: ", config.PORT);

    // Call the setupLocalTunnel function to set up a tunnel using localtunnel library
    setupLocalTunnel();
});