backend_adaptive_learning/index.js

import express from "express";
import cors from "cors";
import dotenv from "dotenv";
import { testConnection } from "./database/db.js";
import router from "./routes/index.js";
import cookieParser from "cookie-parser";
import promBundle from "express-prom-bundle";

dotenv.config();
const app = express();

const metricsMiddleware = promBundle({
  includeMethod: true,
  includePath: true,
  includeStatusCode: true,
  promClient: {
    collectDefaultMetrics: {},
  },
});

app.use(metricsMiddleware);

const corsOptions = {
  origin: `${process.env.CLIENT_URL}`,
  methods: ["GET", "POST", "PUT", "DELETE", "OPTIONS"],
  allowedHeaders: ["Content-Type", "Authorization"],
  credentials: true,
};

app.use(cors(corsOptions));

app.use(cookieParser());
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(router);
app.use(express.static("public"));

app.listen(process.env.APP_PORT, () => {
  testConnection();
  console.log(`Server running on port ${process.env.APP_PORT}`);
});