[backend][nodejs] Use express framework instead of http module

backend/nodejs/package.json

@@ -5,7 +5,7 @@
   "main": "lib/app.js",
   "scripts": {
     "test": "ts-mocha -p tsconfig.json src/**/*.spec.ts",
-    "start": "tsc && node lib/app.js build:live",
+    "start": "tsc && node lib/app.js",
     "build": "tsc -p .",
     "build:live": "nodemon --watch 'src/**/*.ts' --exec \"ts-node\" src/app.ts"
   },

backend/nodejs/src/app.ts

@@ -1,15 +1,13 @@
-import {IncomingMessage, ServerResponse} from "http";
-
-const http = require('http');
+import express from 'express';
 const randomDecision = require("./random-decision")
+
+const app = express();
 const port = 3000;
 
-const server = http.createServer((request: IncomingMessage, response: ServerResponse) => {
-    response.statusCode = 200;
-    response.setHeader('Content-Type', 'text/plain');
-    response.end(randomDecision.getRandomChoice().toString());
-});
+app.get('/', ((req, response) => {
+    response.send(randomDecision.getRandomChoice());
+}));
 
-server.listen(port, () => {
-    console.log(`Server listening on port ${port}`)
+app.listen(port, () => {
+    return console.log(`Server is listening on port ${port}`);
 });