NestJS_Basic/catDataMocking/src/app.ts

import * as express from "express";
import * as cors from "cors";

import catsRouter from "./cats/cats.route";

const app: express.Express = express();
const port: number = 8000;

app.use(cors());

// * Logging Middleware
app.use((req, res, next) => {
  console.log(req.rawHeaders[1]);
  next();
});

// * json middleware
app.use(express.json());

app.use(catsRouter);

// * 404 middleware
app.use((req, res, next) => {
  console.log(req.rawHeaders[1]);
  console.log("This is 404 middleware");
  res.send({ error: "404 not found error" });
});

app.listen(port, () => {
  console.log(`server is on ${port}`);
});