feat(express backend): basic structure implemented

back-express/src/app.ts

@@ -0,0 +1,23 @@
+import express, { Request, Response } from "express";
+import config from "./config";
+import cors from "cors";
+
+const app = express();
+const port = config.port;
+
+if (config.enableCors) {
+  app.use(cors());
+}
+
+app.use((req, res, next) => {
+  console.log(`${req.method} request for ${req.url}`);
+  next();
+});
+
+app.get("/", (req: Request, res: Response) => {
+  res.send("Hello, TypeScript Express!");
+});
+
+app.listen(port, () => {
+  console.log(`Server running at http://localhost:${port}`);
+});

back-express/src/config.ts

@@ -0,0 +1,10 @@
+import { configDotenv } from "dotenv";
+
+configDotenv();
+
+const config = {
+  enableCors: false,
+  port: process.env.PORT || 3000,
+};
+
+export default config;