feat(api): initialize Express server with health check and hello endpoint

- Set up Express server with CORS and JSON parsing middleware
- Implemented root endpoint to confirm API is running
- Added health check endpoint returning status and timestamp
- Created hello endpoint returning a greeting message
- Configured TypeScript with strict settings and module resolution

Author: upayanmazumder

api/package.json

@@ -2,8 +2,11 @@
   "name": "api",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "dist/index.js",
   "scripts": {
+    "dev": "nodemon --watch src --exec \"ts-node\" src/index.ts",
+    "build": "tsc -p tsconfig.json",
+    "start": "node dist/index.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "keywords": [],
@@ -16,6 +19,7 @@
     "express": "^5.1.0"
   },
   "devDependencies": {
+    "@types/cors": "^2.8.19",
     "@types/express": "^5.0.5",
     "@types/node": "^20.19.24",
     "nodemon": "^3.1.10",

api/src/index.ts

@@ -0,0 +1,25 @@
+import express from "express";
+import cors from "cors";
+
+const app = express();
+app.use(cors());
+app.use(express.json());
+
+const PORT = process.env.PORT || 4000;
+
+app.get("/", (_req, res) => {
+  res.send("API is running");
+});
+
+app.get("/api/health", (_req, res) => {
+  res.json({ status: "ok", timestamp: Date.now() });
+});
+
+app.get("/api/hello", (_req, res) => {
+  res.json({ message: "Hello from the API" });
+});
+
+app.listen(Number(PORT), () => {
+  // eslint-disable-next-line no-console
+  console.log(`API server listening on port ${PORT}`);
+});

api/tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "CommonJS",
+    "outDir": "dist",
+    "rootDir": "src",
+    "strict": true,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "skipLibCheck": true
+  },
+  "include": ["src/**/*.ts"]
+}