main.js

const http = require("http");
const path = require("path");
const fs = require("fs");

const server = http.createServer((req, res) => {
    if (req.url === "/") {
        fs.readFile(
            path.join(__dirname, "public", "index.html"), 
            (err, content) => {
                if(err) throw err;
                res.writeHead(200, {"Content-Type": 'text/html'});
                res.end(content);
            }
        );
    }

    if (req.url === "/about") {
        fs.readFile(
            path.join(__dirname, "public", "about.html"), 
            (err, content) => {
                if(err) throw err;
                res.writeHead(200, {"Content-Type": 'text/html'});
                res.end(content);
            }
        );
    }

    if (req.url === "/api/users") {
        const users = [
            {name: "Jason", age: 22},
            {name: "Erica", age: 20}
        ];
        res.writeHead(200, {"Content-Type": 'application/json'});
        res.end(JSON.stringify(users));
    }
});

const PORT = process.env.PORT || 5000

server.listen(PORT, () => console.log(`Server running on port ${PORT}`));