• // Express Server Setup
• JavaScript
• index.js
•  
• // define the variables
• const express = require('express');
• // app variable represents return values from express object
• const app = express();
• // assign the localhost server port #
• // usually 8080 or 3000
• const port = 3000;
•  
• // start the server and wait for a response
• app.listen( port, () => {
  • console.log(`App Server is running : Listening on port ${ port }`);
• });
•  
• // process 'get' response from root
• app.get( '/>', ( req, res ) => {
  • res.send('<h3>Hello World!!</h3>');
• });
• // setting up a path parameter for sub directories
• app.get( '/d/:subDir', ( req, res ) => {
  • const { subDir } = req.params;
  • res.send(`<h3>Now browsing the ${ subDir } sub directory</h3>`);
• });
• // setting up a path parameter for sub directories plus post ID
• app.get( '/r/:subreddit/:postId', ( req, res ) => {
  • const { subreddit, postId } = req.params;
  • res.send(`<h3>Viewing Post ID: ${ postId } on the ${ subreddit } subreddit</h3>`);
• });
• // setting up a path for search parameter
• app.get( '/search', ( req, res ) => {
  • const { q } = req.query;
  • if ( !q ) {
    • res.send('<h3>Search Field Empty, No Results!</h3>');
  • } else {
    • res.send(`<h3>Search results for: ${ q }</h3>`);
  • }
• })
•  
• // set Standard Paths
• // about directory
• app.get( '/about', ( req, res ) => {
  • res.send('<h3>This is the "About Us" page.</h3>');
• });
• // login directory
• app.get( '/login', ( req, res ) => {
  • res.send('<h3>This is the "Log In" page.</h3>');
• });
•  
• // path error detect catch all
• // if other than the above routing, do this
• app.get( '*', (req, res ) => {
  • res.send('<h3>Invalid Path : Path Not Found!</h3>');
• });